US Pat. No. 9,452,792

VEHICLE COLLISION ENERGY ABSORBING MEMBER EXCELLENT IN ENERGY ABSORBING PERFORMANCE AND MANUFACTURING METHOD THEREFOR

JFE Steel Corporation, (...

1. A vehicle collision energy absorbing member formed by shaping a high strength thin steel sheet,
wherein the high strength thin steel sheet has a tensile strength TS of at least 980 MPa, and has an n-value and a limit bending
radius Rc satisfying Formula (1) below:

Rc/t?1.31×ln(n)+5.21  (1);

where
Rc: limit bending radius (mm),
t: sheet thickness (mm), and
n: n-value obtained for a true strain is 5% to 10%,the high strength thin steel sheet includes a chemical composition containing, by mass %:
C: 0.14% to 0.30%;
Si: 0.01% to 1.6%;
Mn: 3.5% to 10%;
P: 0.060% or less;
S: 0.0050% or less;
Al: 0.01% to 1.5%;
N: 0.0060% or less;
Nb: 0.01% to 0.10%; and
the balance being Fe and incidental impurities, andthe high strength thin steel sheet has a microstructure including a ferrite phase by 30% to 70% in volume fraction with respect
to the entire microstructure and a secondary phase other than the ferrite phase, the ferrite phase having an average grain
size of 1.0 ?m or smaller, the secondary phase at least containing a retained austenite phase by at least 10% in volume fraction
to the entire microstructure, the retained austenite phase having an average spacing of 1.5 ?m or less.

US Pat. No. 9,139,887

BEARING STEEL AND INGOT MATERIAL FOR BEARING HAVING EXCELLENT ROLLING CONTACT FATIGUE LIFE CHARACTERISTICS AND METHOD FOR MANUFACTURING THE SAME

JFE STEEL CORPORATION, T...

1. Bearing steel, comprising a chemical composition including by mass %,
C: 0.56% to 0.70%, inclusive of 0.56% and 0.70%,
Si: 0.15% to 0.50%, inclusive of 0.15% and exclusive of 0.50%,
Mn: 0.60% to 1.50%, inclusive of 0.60% and 1.50%,
Cr: 0.50% to 1.10%, inclusive of 0.50% and 1.10%,
Mo: 0.05% to 0.5%, inclusive of 0.05% and 0.5%,
P: 0.025% or less,
S: 0.025% or less,
Al: 0.005% to 0.500%, inclusive of 0.005% and 0.500%,
O: 0.0015% or less,
N: 0.0030% to 0.015%, inclusive of 0.0030% and 0.015%, and
remainder as Fe and incidental impurities,
wherein “eutectic carbide formation index Ec” represented by following formula (1) is in the range of 0.04= of segregation” represented by following formula (2) is equal to or less than 2.8 in the bearing steel,

Ec=(?0.07×[% Si]?0.03×[% Mn]+0.04×[% Cr]?0.36×[% Al]+0.79)?[% C]  (1)

Degree of segregation=CMo(max)/CMo(ave)  (2)

in formulae (1) and (2), “[% M]” represents content (mass %) of component M and CMo(max) represents the maximum value of Mo intensity value and CMo(ave) represents the average value of Mo intensity value.

US Pat. No. 9,388,484

CONTINUOUS ANNEALING FURNACE FOR ANNEALING STEEL STRIP, METHOD FOR CONTINUOUSLY ANNEALING STEEL STRIP, CONTINUOUS HOT-DIP GALVANIZING FACILITY, AND METHOD FOR MANUFACTURING HOT-DIP GALVANIZED STEEL STRIP

JFE Steel Corporation, T...

1. A continuous annealing furnace for annealing steel strips that is a vertical-type annealing furnace comprising a heating
zone, a soaking zone, and a cooling zone which are disposed in the annealing furnace in this order and in which the steel
strips are transported vertically, the vertical-type annealing furnace being configured so that, while atmosphere gas is supplied
from the outside of the furnace into the furnace and gas inside the furnace is exhausted from a steel-strip-introduction section
located at the lower part of the heating zone, part of the gas inside the furnace is drawn and introduced to a refiner disposed
outside the furnace, the refiner including an oxygen removing apparatus and a dehumidifying apparatus, oxygen and moisture
contained in the gas are removed to lower the dew point of the gas, and gas having a lowered dew point is put back into the
furnace,
wherein at least one gas inlet through which gas is drawn from the furnace into the refiner is disposed in the vicinity of
the entry side of the furnace at a distance of 6 m or less in the vertical direction and 3 m or less in the furnace-length
direction from the steel-strip-introduction section located at the lower part of the heating zone.

US Pat. No. 9,089,924

INDIRECT SPOT WELDING METHOD

JFE Steel Corporation, T...

1. An indirect spot welding method for welding a member composed of at least two overlapping metal sheets, the method comprising:
holding a spot welding electrode against the at least two overlapping metal sheets while applying pressure to the spot welding
electrode from one side of the member;

attaching a feeding point to one of the at least two overlapping metal sheets on another side of the member at a location
remote from the spot welding electrode;

allowing current to flow between the spot welding electrode and the feeding point;
maintaining a constant electrode force during the indirect spot welding of the member; and
for the current, a duration of the indirect spot welding of the member is divided into two time periods t1 and t2, wherein the method includes applying current set at C1 in a first time period t1, and applying current set at C2 higher than current C1 in a second time period t2.

US Pat. No. 9,346,123

DEVICE TO IMPROVE IRON LOSS PROPERTIES OF GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR IMPROVING IRON LOSS PROPERTIES OF GRAIN ORIENTED ELECTRICAL STEEL SHEET

JFE Steel Corporation, (...

1. A device that improves iron loss properties of a grain oriented electrical steel sheet having been subjected to finish
annealing by irradiating a surface of the grain oriented electrical steel sheet with a laser to reduce iron loss of the electrical
steel sheet, comprising a laser irradiator having a laser beam emission port wherein, a distance between the laser beam emission
port of the laser beam irradiator emitting laser and a laser beam irradiation point on the electrical steel sheet is L (mm);
a laser beam irradiation angle formed by a line linking the laser beam emission port and the laser beam irradiation point
with respect to a direction vertical to the electrical steel sheet is ? (°); and L?50, the laser beam emission port is positioned
such that L and ? satisfy:
60?0.3L???60 when L?100

40?0.1L???60 when 100
??60 when L>400.

US Pat. No. 9,090,952

HIGH-STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR PRODUCING THE SAME

JFE Steel Corporation, T...

1. A high-strength cold-rolled steel sheet comprising, in terms of percent by mass, a composition of C: 0.05 to 0.3%, Si:
0.6 to 3.0%, Mn: 1.0 to 3.0%, P: 0.1% or less, S: 0.05% or less, Al: 0.01 to 1%, N: 0.01% or less, and the balance being Fe
and unavoidable impurities, wherein a coverage ratio of reduced iron oxides on a steel sheet surface is 40% or more, the iron
oxides comprising (Fe,Mn)2SiO4.
US Pat. No. 9,051,654

GALVANIZED STEEL SHEET

JFE STEEL CORPORATION, T...

1. A galvanized steel sheet, comprising:
a surface film on a surface of a galvanized layer on one or both sides of the steel sheet, the surface film having a two-layer
structure including a first layer film and a second layer film,

wherein the first layer film is formed by applying a surface treatment solution (A) having a pH of 8 to 10 onto the surface
of the galvanized layer and drying the surface treatment solution (A) by heating,

the surface treatment solution (A) containing a water-soluble zirconium compound (a), a tetraalkoxysilane (b), an epoxy group-containing
compound (c), a chelating agent (d), a vanadate compound (e), and a metal compound (f) containing at least one selected from
the group consisting of Ti, Al, and Zn so that conditions (I) to (V) below are satisfied,

wherein the second layer film is formed by applying a surface treatment solution (B) containing an organic resin (h) onto
a surface of the first layer film and drying the surface treatment solution (B) by heating, and

wherein a total combined thickness of the first layer film and the second layer film on the surface of the galvanized layer
is 0.1 to 3 ?m on any side:

(I) a ratio (aZr/b) of the mass (aZr) of the water-soluble zirconium compound (a) in terms of Zr to the mass of the tetraalkoxysilane (b) is 1.0 to 6.0,

(II) a ratio (b/cS) of the mass of the tetraalkoxysilane (b) to the mass of a solid (cS) of the epoxy group-containing compound (c) is 0.1 to 1.6,

(III) a ratio (b/cS) of the mass of the tetraalkoxysilane (b) to the mass of a solid (dS) of the chelating agent (d) is 0.3 to 2.0,

(IV) a ratio (eV/dS) of the mass (eV) of the vanadate compound (e) in terms of V to the mass of a solid (dS) of the chelating agent (d) is 0.03 to 1.0, and

(V) a ratio (fM/dS) of the total metal mass (fM) of the metal compound (f) to the mass of a solid (dS) of the chelating agent (d) is 0.05 to 0.8.

US Pat. No. 9,458,521

HIGH TENSILE STRENGTH GALVANIZED STEEL SHEETS EXCELLENT IN FORMABILITY AND METHODS OF MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A formable galvanized steel sheet, comprising, in terms of % by mass, 0.05 to 0.3% of C, 0.01 to 2.5% of Si, 0.5 to 3.5%
of Mn, 0.003 to 0.100% of P, 0.02% or less of S, 0.010 to 1.5% of Al, and 0.01 to 0.2% in total of at least one element selected
from Ti, Nb and V, the remainder being Fe and unavoidable impurities, having a microstructure composed of, in terms of area
fraction, 20 to 87% of ferrite, 3 to 10% in total of martensite and residual austenite, and 10 to 60% of tempered martensite,
a first phase composed of the ferrite, and a second phase composed of the martensite, residual austenite, and tempered martensite
having an average crystal grain diameter of 3 ?m or less, and having a ratio of absorption energy AE to tensile strength TS
(AE/TS) not less than 0.063 as a result of heat applied at a temperature of 500° C. to Ac1 transformation point at an average temperature rising rate of 10° C./s or more.
US Pat. No. 9,175,414

COLD ROLLED STEEL SHEET

JFE Steel Corporation, T...

1. A cold rolled steel sheet comprising an inorganic film containing a crystalline layered material on a surface thereof,
wherein the inorganic film has an average film thickness of 10 nm to 2000 nm, wherein the crystalline layered material is
a layered double hydroxide represented by [M2+1-XM3+X(OH)2][An?]x/n.zH2O, wherein:
M2+ is one or more of Ca2+, Zn2+, Pb2+, and Sn2+;

M3+ is one or more of Cr3+, 3/4Zr4+, and Mo3+; and

An? is one or more of F?, Cl?, Br?, (C2O4)2?, I?, (NO3)?, (SO4)2?, (BrO3)?, (IO3)?, (V10O28)6?, (Si2O5)2?, (ClO4)?, (CH3COO)?, [C6H4(CO2)2]2?, (C6H5COO)?, [C8H16(CO2)2]2?, n(C8H17SO4)?, n(C12H25SO4)?, n(C18H37SO4)?, and SiO44?,

and wherein 0

US Pat. No. 9,410,855

METHOD FOR PRESS FORMING ANALYSIS

JFE STEEL CORPORATION, T...

1. A method for press forming analysis, comprising the steps of:
(1) calculating a data representing a shape of and a distribution of stress in a press-formed part before being released from
a press die in a global coordinate system, and performing a coordinate transformation on a basis of the data before being
released from the press die to calculate a distribution of stress (a) before being released from the press die in a local
coordinate system;

(2) performing a springback analysis on a basis of the data before being released from the press die, wherein the performing
of the springback analysis includes:

(i) calculating a distribution of residual stress in the press-formed part after being released from the press die and performing
the coordinate transformation to calculate a distribution of residual stress (b) in the press-formed part in the local coordinate
system; and

(ii) calculating a first shape data (d) of the press-formed part after being released from the press die;
(3) calculating a difference (a-b) between the distributions of stress (a) and (b) as a springback effective stress (SB effective
stress), performing a reverse coordinate transformation to calculate a distribution of SB effective stress in the global coordinate
system, changing or removing the SB effective stress in an analysis target region in the distribution of SB effective stress
to calculate a second distribution of SB effective stress in the press-formed part, and performing the springback analysis
on a basis of the second distribution of SB effective stress to calculate a second shape data (c) of the press-formed part
after being released from the press die; and

(4) calculating a difference (c-d) between the second shape data (c) and the first shape data (d) to determine a degree of
influence of the analysis target region on the overall shape.

US Pat. No. 9,108,246

METHOD FOR MIXING RAW MATERIAL POWDER FOR POWDER METALLURGY AND METHOD FOR PRODUCING RAW MATERIAL POWDER FOR POWDER METALLURGY

JFE STEEL CORPORATION, T...

1. A method for mixing a raw material powder for powder metallurgy, comprising:
obtaining a powder mixture by adding, to an iron powder:
an alloying powder,
a binding agent, and
one or more members selected from lubricant powders, free-machining agent powders, and lubricant powders for sliding surface;
and

performing first agitation mixing on the powder mixture to obtain a resulting powder mixture, the first agitation mixing including:
a first agitation with a first rotation speed while increasing the temperature to a temperature TK equal to or higher than the melting point TM of the binding agent;

a second agitation with a second rotation speed while maintaining the temperature TK; and

a third agitation with a third rotation speed while reducing the temperature from the temperature TK,

wherein an apparent density of the resulting powder mixture is controlled by setting mixing parameters so that either (i)
the second rotation speed is relatively stronger than both the first rotation speed and the third rotation speed, or (ii)
the second rotation speed is relatively stronger than one of the first rotation speed and the third rotation speed and the
second rotation speed is approximately equal to the other of the one of the first rotation speed and the third rotation speed.

US Pat. No. 9,130,199

STAINLESS STEEL FOR FUEL CELL HAVING GOOD CORROSION RESISTANCE AND METHOD FOR PRODUCING THE SAME

JFE Steel Corporation, T...

6. A stainless steel for a fuel cell, comprising a coating being formed on a surface of a stainless steel having a composition
that includes, in terms of percent by mass, C: 0.03% or less, Si: 1.0% or less, Mn: 1.0% or less, S: 0.01% or less, P: 0.05%
or less, Al: 0.20% or less, N: 0.03% or less, Cr: 20 to 40%, at least one selected from Nb, Ti, and Zr, in total: 1.0% or
less, and the balance being Fe and unavoidable impurities, by performing an anodic electrolyzation treatment in an electrolyte
solution, and having an intensity ratio [(OO/OH)/(Cr/Fe)] of 1.0 or more determined by X-ray photoelectron spectroscopy analysis,
wherein the anodic electrolyzation treatment is performed in an electrolyte solution having a sodium sulfate concentration
of 0.1 to 3.0 mol/L and pH of 7 or less at a potential of 0.8 to 1.8 V vs. SHE for 10 seconds or longer.
US Pat. No. 9,322,091

GALVANIZED STEEL SHEET

JFE STEEL CORPORATION, T...

1. A high-strength galvanized steel sheet formed into a coil and having crashworthiness and excellent uniformity of mechanical
characteristics, comprising, on a mass percent basis, C: more than 0.060% and 0.13% or less, Si: 0.01% or more and 0.7% or
less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.100% or less, S: 0.010% or less, sol.Al: 0.005% or more and
0.100% or less, N: 0.0100% or less, Nb: 0.005% or more and 0.10% or less, Ti: 0.03% or more and 0.15% or less, and the balance
comprising Fe and incidental impurities, and satisfying the following formula (1), wherein the high-strength galvanized steel
sheet has a structure including ferrite and martensite, the ferrite having an average grain diameter of 15 ?m or less and
an area percentage of 80% or more, the martensite having an area percentage of 1% or more and 15% or less:
(Nb/93+Ti*/48)/(C/12)>0.08  (1)
wherein Ti*=Ti?(48/14)N?(48/32)S, and C, Nb, Ti, N, and S denote the corresponding content (mass %) of the steel;wherein the high-strength galvanized steel sheet has a tensile strength (TS) of 590 MPa or more, a yield ratio (YR) of 0.70
or more, and a bake hardenability (BH) level of 60 MPa or more.

US Pat. No. 9,297,060

HIGH STRENGTH GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A method for manufacturing a galvanized steel sheet, comprising hot rolling and cold rolling a steel slab to form a steel
sheet, annealing the steel sheet at an annealing temperature of higher than 740° C. and lower than 840° C. in a continuous
galvanizing and galvannealing line (CGL), cooling the steel sheet at an average cooling rate of 2 to 30° C./sec from the annealing
temperature to immersion in a galvanizing bath, immersing the steel sheet in the galvanizing bath for galvanization, and cooling
the steel sheet to 100° C. or lower at an average cooling rate of 5 to 100° C./sec after galvanization or further performing
alloying treatment of plating after galvanization, and cooling the same to 100° C. or lower at an average cooling rate of
5 to 100° C./sec after the alloying treatment;
maintaining 2.2?[Mneq]?3.1 and 0.42?8[% P]+150B*?0.73;
maintaining ferrite and a second phase as a microstructure of the steel, the second phase area ratio being 3 to 15%, and the
ratio of the area ratio of martensite and retained ? to the second phase area ratio being more than 70%, with 50% or more
of the area ratio of the second phase existing in the grain boundary triple point; and

maintaining [Mneq]=[% Mn]+1.3[% Cr]+8[% P]+150B* and B*=[% B]+[% Ti]/48×10.8×0.9+[% Al]/27×10.8×0.025, wherein [% Mn], [%
Cr], [% P], [% B], [% Ti], and [% Al] represent the content of each of Mn, Cr, P, B, Ti, and sol.Al, respectively, and in
the case of B*?0.0022, B*=0.0022 being established.

US Pat. No. 9,222,146

APPARATUS FOR MANUFACTURING MOLTEN ZINC COATED STEEL SHEET

JFE Steel Corporation, (...

1. An apparatus for manufacturing a steel sheet with a molten zinc coating comprising:
a galvannealing furnace,
a molten zinc coating device,
a temper rolling mill,
an acid solution contacting device which provides an acid solution film on a surface of the steel sheet, and
a cleaning device, said molten zinc coating device, said temper rolling mill, said acid solution contacting device, and said
cleaning device are configured to provide treatment to an upper surface and a lower surface of the steel sheet,

wherein the acid solution contacting device and the cleaning device are separated from each other with a region therebetween,
and an absolute humidity controller is configured to control the thickness of the acid solution film by controlling the absolute
humidity in the region between the acid solution contacting device and the cleaning device, wherein said absolute humidity
controller is disposed in the region between the acid solution contacting device and cleaning device, said absolute humidity
controller includes a cover which encloses the region between the acid solution contacting device and the cleaning device,
said absolute humidity controller includes a measuring means, a blower, and encloses the surfaces of the steel sheet as the
steel sheet passes through said absolute humidity controller, and wherein the absolute humidity controller maintains the amount
of water vapor at 2000 ppm by mass or more and a dew point of at least ?12.7° C. in the absolute humidity controller.

US Pat. No. 9,157,132

HIGH-STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A high-strength galvanized steel sheet having excellent formability, the steel sheet having a component composition containing,
on the basis of mass percent, 0.05 to 0.2% C, 1.05 to 2.5% Si, 1.5 to 3.0% Mn, 0.001 to 0.05% P, 0.0001 to 0.01% S, 0.001
to 0.1% Al, and 0.0005 to 0.01% N, the balance being Fe and incidental impurities; and the steel sheet having a microstructure
including a ferritic phase and a martensitic phase including a tempered-martensitic phase, the ferritic phase having an area
fraction of 30% or more relative to an entirety of the microstructure, the martensitic phase having an area fraction of 30
to 50% relative to the entirety of the microstructure, and the tempered-martensitic phase having an area fraction of 70% or
more and 94% or less relative to an entirety of the martensitic phase.

US Pat. No. 9,107,339

SEED-COVERING AGENT AND SEED COVERED WITH SEED-COVERING AGENT

JFE STEEL CORPORATION, T...

1. A seed covered with a seed-covering agent including an iron powder component, the seed-covering agent comprising;
a first cover layer containing fine iron particles having an average particle size from 1 ?m to 40 ?m in the iron powder component
and a binder, and

a second cover layer, located above the first cover layer, containing coarse iron particles having an average particle size
from 63 ?m 150 ?m in the iron powder component and a binder; and

wherein, in the iron powder component, (i) a mass ratio of the iron particles having a particle size of not more than 63 ?m
to a total mass of the iron powder component is 8% to 75% and (ii) a mass ratio of the iron particles having a particle size
of more than 63 ?m and not more than 150 ?m to the total mass of the iron powder component is 25% to 91.5%.

US Pat. No. 9,057,123

HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME

JFE Steel Corporation, (...

1. A hot-rolled steel sheet having a chemical composition including, by mass %: C: 0.060% to 0.150%; Si: 0.15% to 0.70%; Mn:
1.00% to 1.90%; P: 0.10% or less; S: 0.010% or less; Al: 0.01% to 0.10%; N: 0.002% to 0.005%; Nb: 0.010% to 0.100%; and the
balance including Fe and incidental impurities,
the steel sheet further having a microstructure with multi phase wherein ferrite with an average grain size of 18 ?m or less
is contained at a volume fraction of at least 75% and pearlite with an average grain size of at least 2 ?m is contained at
a volume fraction of at least 5%, the balance comprising low-temperature-induced phases, the pearlite having a mean free path
of at least 5.0 ?m.

US Pat. No. 9,194,190

THREADED JOINT FOR PIPE

JFE STEEL CORPORATION, T...

1. A threaded joint for a pipe, comprising:
a pin component including (i) a male member, (ii) a nose extending from the male member to an end of the pin component, the
nose including a cylindrical portion next to the male member, and (iii) a shoulder provided at the end of the pin component;
and

a box component including (i) a female member configured to form a screw connection with the male member, (ii) a tapered inner
peripheral surface that faces and comes into metal-to-metal contact with an outer peripheral surface of the nose when the
female member and the male member form the screw connection, and (iii) a shoulder that contacts the shoulder of the pin component
when the female member and the male member form the screw connection, wherein

the tapered inner peripheral surface of the box component has a surface with a consistent taper angle that spans a distance
entirely from the cylindrical portion of the nose to the end of the pin component when the male member and the female member
form the screw connection,

the tapered inner peripheral surface of the box component interferes with the outer peripheral surface of the nose and a seal
surface is formed at a contact interface therebetween when the female member and the male member form the screw connection,

the outer peripheral surface of the nose has an outward convex curve in an axial cross sectional view of the pin component,
the convex curve is comprised of a composite curve including a plurality of outward convex arcs each having different radiuses
of curvature, and:

(i) the arcs are connected in sequence on the outer peripheral surface of the nose,
(ii) one of the arcs is connected to the cylindrical portion of the male member, and
(iii) the arcs are each curved so that the radius of curvature of the respective arcs increases with distance from the male
member.

US Pat. No. 9,109,884

METHOD AND EQUIPMENT FOR MANUFACTURING ELECTRIC RESISTANCE WELDED STEEL PIPE

JFE Steel Corporation, (...

1. A method of operating an electric resistance welded steel pipe manufacturing line comprising:
(a) producing sample open, substantially tubular steel pipes from a steel strip as a testing sample by roll forming, said
open, substantially tubular steel pipes each having an opening and two proximate, opposing edges adjacent to said opening,
and having sample groove shapes having a sample groove height, said sample groove shapes being applied to each edge by tapering
corner portions at inner and outer tubular surfaces of each one of said edges, and measuring said sample groove height;

establishing through measurements obtained by variation of sample groove height an adjustment of a setting of a level of electric
welding power to a value at which the seam Charpy test transition temperature is minimal as a function of said electric welding
power, thereby establishing a relationship between groove height and welding electric power at which toughness of a weld is
optimal;

and
(b) producing an electric resistance welded steel pipe as a product based upon said relationship according to the following
steps:

(i) forming an open, substantially tubular product pipe from a steel strip by roll forming as a product source, said open,
substantially tubular steel pipe having an opening and two proximate, opposing edges adjacent to said opening, and having
product groove shapes having a product groove height, said product groove shapes being applied to each edge by tapering corner
portions at inner and outer tubular surfaces of each one of said edges;

(ii) measuring said product groove height;
(iii) obtaining a setting of a value of welding power at which toughness is optimal based on the measured product groove height
and said relationship as obtained in step (a);

(iv) welding both edges of the open, substantially tubular steel product pipe by electric resistance welding, wherein the
welding power is set to said value at which toughness is optimal for the measured product groove height.

US Pat. No. 9,068,237

METHOD FOR DESULFURIZING HOT METAL

JFE STEEL CORPORATION, T...

1. A method for desulfurizing molten hot metal, the method comprising:
taking a sample out from the molten hot metal in at least one stage of before, during, and after a desulfurization treatment
of the molten hot metal,

analyzing an S concentration of the sample and determining an S concentration of the molten hot metal, and
based on the determined S concentration, (i) conducting further subsequent desulfurization, (ii) judging an end of desulfurization,
or (iii) determining subsequent desulfurization conditions,

wherein the S concentration of the sample is analyzed by a method comprising:
oxidizing the sample under high frequency induction heating in a pure oxygen atmosphere to convert S in the sample to SO2 by supplying pure oxygen with an oxygen concentration of not less than 99.5 vol.%, the high frequency inducting heating step
generating an SO2-containing gas by combustion of the sample, and

analyzing the SO2-containing gas generated in the high frequency induction heating step through an ultraviolet fluorescence method to quantify
S concentration in the sample.

US Pat. No. 9,327,327

METHOD OF MANUFACTURING PIPE WITH DIFFERENT DIAMETER ALONG A LONGITUDINAL DIRECTION AND DIE FOR FORMING

JFE Steel Corporation, (...

1. A method of manufacturing a pipe with different diameters along a longitudinal direction that has a small diameter portion,
a large diameter portion, and a diameter-changing portion provided between the small diameter portion and the large diameter
portion and is formed by press forming a blank made of a metal sheet, comprising:
providing a U-shaped forming die set including a lower die, wherein the lower die includes a forming surface that forms a
U-shaped inner cross section having a pair of vertical walls, wherein a length of the vertical walls of the lower die is longer
than a length of the vertical walls of a corresponding portion a U-shaped formed part;

press forming the blank with the U-shaped forming die set into the U-shaped formed part having a U-shaped cross section including
a pair of vertical walls;

providing an O-shaped forming die set including a lower die in which the U-shaped formed part is set and a upper die to which
the vertical walls of the U-shaped formed part contact, wherein each of the lower die and the upper die includes a forming
surface having an arc portion that forms a circular inner cross section when the upper die and the lower die are mated at
die mating lines and the die mating lines in a cross-sectional view are inclined downwardly from the inner cross section when
the lower die is mated under the upper die; and

press forming the U-shaped formed part with the O-shape forming die set into a circular cross-section formed part,
wherein
a ratio t/D of a sheet thickness t of the blank to a diameter D of the circular inner cross section at each of portions of
the O-shaped forming die set corresponding to the small diameter portion and the large diameter portion, is 0.010?t/D?0.080,
and a circumferential compressive strain given by expression (1) is equal to or more than 0.5%:

circumferential compressive strain=(blank width in sheet width direction that becomes pipe circumferential direction?perimeter
of die set)/perimeter of die set×100(%)   (1).

US Pat. No. 9,194,017

HOT-ROLLED STEEL SHEET HAVING EXCELLENT COLD FORMABILITY AND HARDENABILITY AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A hot-rolled steel sheet having a tensile strength of 500 MPa or less and, the steel sheet having a chemical composition
comprising, by mass %,
C: 0.18% or more and 0.29% or less,
Mn: 0.88% or less,
S: 0.03% or less,
N: 0.0050% or less,
Ti: 0.002% or more and 0.05% or less,
B: 0.0005% or more and 0.0050% or less, and
Si: 0.4% or less,
P: 0.1% or less,
sol.Al: 0.1% or less,the balance being Fe and inevitable impurities and a microstructure wherein a fraction of ferrite and pearlite with respect
to the whole microstructure is 95% or more in terms of a sum of volume fractions of both ferrite and pearlite, wherein mean
grain diameter of the ferrite is 7.0 ?m or more and 15.0 ?m or less, and wherein a volume fraction of the ferrite with respect
to the whole microstructure is 50% or more.
US Pat. No. 9,290,824

METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

JFE Steel Corporation, T...

1. A method of producing a grain-oriented electrical steel sheet by hot-rolling a steel slab of a chemical composition comprising
C: 0.001 to 0.10 mass %, Si: 1.0 to 5.0 mass %, Mn: 0.01 to 1.0 mass %, at least one of S and Se: 0.01 to 0.05 mass % in total,
sol. Al: 0.003 to 0.050 mass %, N: 0.001 to 0.020 mass % and the balance being Fe and inevitable impurities, subjecting to
single cold rolling or two or more cold rollings including an intermediate annealing therebetween to a final thickness and
further to a primary recrystallization annealing, application of an annealing separator composed mainly of MgO and a finish
annealing, wherein the primary recrystallization annealing a temperature rising rate S1 between 500 to 600° C. is made to
not less than 100° C./s and a temperature rising rate S2 between 600 to 700° C. is made to 30° C./s to 0.6×S1° C./s, while
a total content W (mol %) of an element having an ionic radius of 0.6 to 1.3 Å and an attracting force between ion and oxygen
of not more than 0.7 Å?2 included in the annealing separator to MgO is adjusted to satisfy the following equation (1) in relation to the S2:
0.01S2?5.5?Ln(W)?0.01S2?4.3  (1).

US Pat. No. 9,315,875

METHOD OF REFINING MOLTEN IRON

JFE STEEL CORPORATION, T...

1. A method of refining molten iron, the method comprising:
charging molten iron and a cold iron source into a converter refining vessel;
supplying or charging an auxiliary material containing CaO as a main component to the converter refining vessel;
supplying a first oxygen source and a first silicon-containing material or a combination of a silicon-containing material
and a carbonaceous material to the converter refining vessel as a heat source to dissolve the cold iron source and conduct
desiliconization of the molten iron;

removing at least a part of slag produced by the desiliconization as an intermediate slag removal; and
subsequently supplying a slag-forming agent and a second oxygen source to the molten iron in the converter refining vessel
to conduct dephosphorization, wherein

the desiliconization is carried out under conditions such that a basicity of the slag after desiliconization is in the range
of 0.5 to 1.5,

where basicity: mass % CaO/mass % SiO2,

a molten iron temperature after the desiliconization in the range of 1280° C. to 1350° C., and
not less than 30 mass % of the slag produced in the desiliconization is removed from the converter refining vessel in the
intermediate slag removal.

US Pat. No. 9,304,078

ELECTRON GUN ABNORMALITY DETECTING DEVICE AND ELECTRON GUN ABNORMALITY DETECTING METHOD

JFE STEEL CORPORATION, T...

1. An electron gun abnormality detecting device for detecting an abnormality in electron guns of a magnetic domain refining
device for an electrical steel sheet, the magnetic domain refining device including at least a first electron gun and a second
electron gun, and the electron gun abnormality detecting device comprising:
a magnetooptic element configured to contact with and separate from an inspection region set to include a boundary between
a magnetic domain discontinuity generated by irradiation of a surface of the electrical steel sheet with an electron beam
by the first electron gun and a magnetic domain discontinuity generated by irradiation thereof with an electron beam by the
second electron gun, and configured to detect a steel sheet magnetic domain structure in the inspection region as an optical
property;

a light source configured to irradiate the magnetooptic element with linearly polarized light; and
a detector configured to detect polarized light rotated by the steel sheet magnetic domain structure transferred to the magnetooptic
element.

US Pat. No. 9,290,830

FERRITIC STAINLESS STEEL

JFE Steel Corporation, T...

1. Ferritic stainless steel having a chemical composition containing, by mass %, C: 0.020% or less, Si: 3.0% or less, Mn:
3.0% or less, P: 0.040% or less, S: 0.030% or less, Cr: 10% to 25%, N: 0.020% or less, Nb: 0.005% to 0.15%, Al: 0.3% or more
and less than 1.0% , Ti: 5×(C %+N %) to 0.5%, Mo: 0.1% or less, W: 0.1% or less, Cu: 0.55% to 2.0%, B: 0.0002% to 0.0050%,
Ni: 0.05% to 1.0%, and the balance being Fe and inevitable impurities, where C % and N % in the expression 5×(C %+N %) respectively
represent the contents (mass %) of the chemical elements C and N, wherein the ferritic stainless steel exhibits a weight gain
by oxidation of less than 50 g/m2.
US Pat. No. 9,222,155

METHOD FOR MANUFACTURING HIGH STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT STRETCH FLANGEABILITY AND FATIGUE RESISTANCE

JFE Steel Corporation, (...

1. A method of manufacturing high strength hot-rolled steel sheets with excellent stretch flangeability and fatigue resistance
comprising:
heating steel at 1150 to 1350° C. which has a composition comprising, in terms of mass %,
C at 0.05 to 0.15%, Si at 0.2 to 1.2%,
Mn at 1.0 to 2.0%, P at not more than 0.04%,
S at not more than 0.005%, Ti at 0.05 to 0.15%,
Al at 0.005 to 0.10% and N at 0.002 to 0.007%,
wherein content of dissolved Ti is not less than 0.02%, the balance being represented by Fe and inevitable impurities,
hot rolling the steel into a hot-rolled sheet which is terminated at a finishing temperature of 850 to 950° C.,
cooling the steel sheet to 530° C. at an average cooling rate of not less than 30° C./s and less than 55° C./s,
cooling the steel sheet to a coiling temperature of 300 to 500° C. at an average cooling rate of not less than 100° C./s,
and

coiling the steel sheet at the coiling temperature such that the high-strength hot-rolled steel sheets comprise a bainite
single phase microstructure having an average grain diameter of more than 3.0 to 5 ?m.

US Pat. No. 9,175,374

HIGH STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT DEEP DRAWABILITY

JFE Steel Corporation, T...

1. A high strength hot-dip galvanized steel sheet having excellent deep drawability comprising a chemical composition containing
C: 0.010% or more and 0.04% or less, Si: more than 1.0% and 1.5% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or
more and 0.1% or less, S: 0.01% or less, sol. Al: 0.005% or more and 0.5% or less, N: 0.01% or less, Nb: 0.010% or more and
less than 0.05%, Ti: 0.015% or more and 0.120% or less, and the remainder comprising Fe and incidental impurities, on a percent
by mass basis, wherein contents (percent by mass) of Nb and C in the steel satisfy the relationship of (Nb/93)/(C/12)<0.20
and further satisfy 0.005 of martensite on an area ratio basis, the tensile strength is 440 MPa or more, the average r value is 1.30 or more, and the
absolute value of the planar anisotropy of the r value (?r) is 0.20 or less,
where C*=C-(12/93)Nb-(12/48){Ti-(48/14)N-(48/32)S} and C, Nb, Ti, N, and S represent the contents (percent by mass) of their
respective elements in the steel.

US Pat. No. 9,121,087

HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A high-strength steel sheet comprising, on a mass percent basis:
0.17%-0.73% C;
3.0% or less Si;
0.5%-3.0% Mn;
0.1% or less P;
0.07% or less S;
3.0% or less Al;
0.010% or less N; and
the balance being Fe and incidental impurities, wherein Si+Al satisfies 0.7% or more, and
wherein with respect to microstructures of the steel sheet, a proportion of an area of martensite is 10% to 90% with respect
to all microstructures of the steel sheet, retained austenite content is 6% to 50%, a proportion of an area of bainitic ferrite
in upper bainite is 5% or more with respect to all microstructures of the steel sheet, 25% or more of the martensite is tempered
martensite, the sum of the proportion of the area of martensite with respect to all microstructures of the steel sheet, the
retained austenite content, and the proportion of the area of bainitic ferrite in upper bainite with respect to all microstructures
of the steel sheet satisfies 65% or more, a proportion of an area of polygonal ferrite with respect to all microstructures
of the steel sheet satisfies 10% or less (including 0%), average C content of retained austenite is 0.70% or more, tensile
strength is 980 MPa to 1862 MPa, and ductility TS×T. EL of 20,000 MPa % to 32,494 MPa %.

US Pat. No. 9,240,266

GRAIN ORIENTED ELECTRICAL STEEL SHEET

JFE Steel Corporation, (...

1. A grain oriented electrical steel sheet comprising a steel sheet, a tension-applying insulating coating on both surfaces
of the steel sheet and a magnetic domain structure modified by strain introduced to one surface of the steel sheet,
wherein 1) tension applied to both surfaces of the steel sheet by the tension-applying insulating coating before strain-introducing
treatment satisfies Formula (1), and an amount of warpage of the steel sheet toward a strain-introduced surface side after
strain-introducing treatment is 1 mm or more and 10 mm or less:

1.06?(tension applied to non-strain-introduced surface)/(tension applied to strain-introduced surface)?2.0  (1),and 2) the amount of warpage of the steel sheet indicates an amount of displacement at a free end of a sample having a length
of 280 mm in a rolling direction when placed so that a transverse direction perpendicular to the rolling direction is vertical,
clamped and fixed at another end opposite a free end over a length of 30 mm in the rolling direction.
US Pat. No. 9,187,829

SURFACE-TREATMENT SOLUTION FOR ZINC OR ZINC ALLOY COATED STEEL SHEET AND METHOD FOR MANUFACTURING ZINC OR ZINC ALLOY COATED STEEL SHEET

JFE Steel Corporation, (...

1. A surface-treatment solution for a zinc or zinc alloy coated steel sheet, comprising:
a silane compound (A) having a hydrolyzable group, the silane compound (A) being obtained from a silane coupling agent (a1)
having a glycidyl group, a tetraalkoxysilane (a2), and a chelating agent (a3);

a zirconium carbonate compound (B);
a vanadate compound (C);
a nitrate compound (D) selected from the group consisting of at least one of ammonium salt and alkali metal salt; and
water,
and satisfying (I) to (IV) below, the surface treatment solution having pH of 8 to 10, wherein (I) to (IV) are as follows:
(I) content of the silane compound (A) with respect to total solid content of the surface-treatment solution is 30 to 70 mass
%;

(II) mass ratio (B/A) of the ZrO2-equivalent mass of the zirconium carbonate compound (B) with respect to the content of the silane compound (A) is 0.3 to
2.0;

(III) mass ratio (C/A) of the V-equivalent mass of the vanadate compound (C) with respect to the content of the silane compound
(A) is 0.01 to 0.15; and

(IV) mass ratio (D/A) of the content of the nitrate compound (D) with respect to the content of the silane compound (A) is
0.005 to 0.08.

US Pat. No. 9,194,016

ANNEALING SEPARATOR FOR GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET

JFE Steel Corporation, (...

1. An annealing separator for a grain oriented electrical steel sheet comprising: Cl: 0.01 mass % to 0.05 mass %; B: 0.05
mass % to 0.15 mass %; CaO: 0.1 mass % to 2 mass %; and P2O3: 0.03 mass % to 1.0 mass %, the annealing separator mainly composed of magnesia having: a degree of activity of citric acid
of 30 seconds to 120 seconds as measured at 40% CAA; a specific surface area of 8 m2/g to 50 m2/g as measured by a BET method; an amount of hydration of 0.5 mass % to 5.2 mass % as measured in terms of ignition loss;
and a content of magnesia particles each having a particle diameter of 45 ?m or more of 0.1 mass % or less, the annealing
separator further containing a water-insoluble compound having a particle diameter of 45 ?m or more to 150 ?m or less in an
amount of 0.05 mass % or more to 20 mass % or less.

US Pat. No. 9,045,913

BRACE MEMBER

JFE STEEL CORPORATION, T...

1. A brace member comprising:
an axial force member having an outer surface extending from a first end to an opposite second end,
the axial force member having a rod shape and having a solid cross-section, the axial force member having a stiffness;
first and second joints located respectively at the first and second ends of the axial force member, the first and second
joints allowing installation of the axial force member between building structures,

wherein with the axial force member installed, via the first and second joints, between building structures and the building
structures are deformed, an axial tension and compression force acts on the axial force member;

a stiffening pipe having a tubular shape with an inner surface, a first end, and an opposite second end,
the stiffening pipe disposed coaxially around the axial force member and supplementing the stiffness of the axial force member,
the axial force member passing through the stiffening pipe;

a retaining ring having a first part with an outer surface and an inner surface,
the outer surface of the first part of the retaining ring being screwed on the inner surface of the first end of the stiffening
pipe,

the inner surface of the first part of the retaining ring being screwed on the outer surface of the axial force member,
the first part of the retaining ring being located interposed between, and in contact with, the inner surface of the first
end of the stiffening pipe and the outer surface of the first end of the axial force member fixing the stiffening pipe to
the axial force member;

a sleeve comprising a first part interposed between the stiffening pipe and the axial force member with i) an outer surface
of the first part of the sleeve being located inside the second end of the stiffening pipe and ii) an inside surface of the
sleeve being located outside of an outer periphery of the outside surface of the second end of the axial force member,

wherein an inside surface of the sleeve is screwed on the outer periphery of the outside surface of the second end of the
axial force member; and

a gap located between the outer surface of the sleeve and the inside the second end of the stiffening pipe.

US Pat. No. 9,476,799

METHOD AND APPARATUS FOR MEASURING CORROSION OF MOBILE BODY

SUZUKI MOTOR CORPORATION,...

1. A method of measuring corrosion of a mobile body having an engine, the method comprising:
measuring a corrosion state in at least one portion of the mobile body and outputting corrosion data by a corrosion sensor
installed in the portion;

measuring a running speed of the mobile body and outputting running speed data by a running speed sensor installed in the
mobile body;

acquiring the corrosion data and the running speed data at a same timing and collecting the corrosion data and the running
speed data with the corrosion data and the running speed data associated with each other;

measuring an engine rotation speed of the mobile body and outputting engine rotation speed data by an engine rotation speed
sensor;

acquiring the engine rotation speed data at a same timing as the running speed data and the corrosion data, and collecting
the engine rotation speed data with the running speed data, and the corrosion data associated with each other; and

deleting, from the engine rotation speed data, the running speed data, and the corrosion data collected with the engine rotation
speed data, the running speed data, and the corrosion data associated with each other, data in a case in which the engine
rotation speed data is greater than 0 and the running speed data is 0, and maintaining at least the corrosion data and the
running speed data in other cases with the corrosion data and the running speed data associated with each other.

US Pat. No. 9,389,169

SURFACE INSPECTION METHOD AND SURFACE INSPECTION APPARATUS FOR STEEL SHEET COATED WITH RESIN

JFE STEEL CORPORATION, T...

1. A surface inspection method for inspecting a steel sheet coated with a resin by imaging the steel sheet coated with the
resin and inspecting for a surface defect on a substrate steel surface of the steel sheet, the surface inspection method comprising:
irradiating the steel sheet with sheet-like light that has been linearly polarized at a predetermined polarization angle;
and

imaging linearly-polarized light polarized by a polarizing filter having a polarization angle of 0 degrees at an acceptance
angle shifted by 2 to 5 degrees with respect to a regular reflection angle of incident light, wherein the acceptance angle
shifted by 2 to 5 degrees is smaller than the regular reflection angle, and

wherein the steel sheet is irradiated with the sheet-like light at an incidence angle different from a Brewster's angle of
the coating by 1 degree or greater.

US Pat. No. 9,266,195

LASER WELDING METHOD

JFE STEEL CORPORATION, T...

1. A laser welding method comprising:
emitting two laser beams along a weld line from an upper surface side of a workpiece, the two laser beams being transmitted
through different optical fibers and having in-focus spot diameters of 0.3 mm or larger;

emitting the laser beams such that a leading laser beam of the two laser beams and a trailing laser beam of the two laser
beams are each inclined toward a direction in which welding proceeds at an incident angle with respect to a direction perpendicular
to an upper surface of the workpiece, the leading laser beam being ahead of the trailing laser beam on the upper surface of
the workpiece in the direction in which welding proceeds, the trailing laser beam being behind the leading laser beam on the
upper surface of the workpiece in the direction in which welding proceeds; and

setting the incident angle of the leading laser beam with respect to the perpendicular to be larger than the incident angle
of the trailing laser beam.

US Pat. No. 9,255,318

HIGH-STEEL GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A galvanized steel sheet comprising: as a chemical composition of steel, on a percent by mass basis, more than 0.015% to
less than 0.10% of C, 0.5% or less of Si, 1.0% to 1.9% of Mn, 0.015% to 0.050% of P, 0.03% or less of S, 0.01% to 0.5% of
sol. Al, 0.005% or less of N, less than 0.30% of Cr, 0.005% or less of B, less than 0.15% of Mo, 0.4% or less of V, less than
0.020% of Ti, and the balance being iron and inevitable impurities, in which 2.2?[Mneq]?3.1, [% Mn]+3.3[% Mo]?1.9, and ([%
Mn]+3.3[% Mo])/(1.3[% Cr]+8[% P]+150B*)<3.5 are satisfied, wherein as a microstructure of the steel comprises ferrite and
a second phase, with a volume fraction of the second phase of 2% to 12% and the second phase includes martensite having a
volume fraction of 1% to 10% and retained ? having a volume fraction of 0% to 5%, wherein a ratio of total volume fraction
of martensite and retained ? to that of the second phase is 70% or more, and a ratio of the volume fraction of the second
phase present at grain boundary triple points to that of the second phase is 50% or more,
where [Mneq] indicates [% Mn]+1.3[% Cr]+8[% P]+150B*+2[% V]+3.3[% Mo], B* indicates [% B]+[% Ti]/48×10.8×0.9+[% Al]/27×10.8×0.025,
[% Mn], [% Cr], [% P], [% B], [Ti], [% Al], [% V], and [% Mo] indicate the contents of Mn, Cr, P, B, Ti, sol. Al, V, and Mo,
respectively, [% B]=0 is represented by B*=0, and B*?0.0022 is represented by B*=0.0022.

US Pat. No. 9,181,609

WELDED STEEL PIPE FOR LINEPIPE HAVING HIGH COMPRESSIVE STRENGTH AND EXCELLENT SOUR GAS RESISTANCE AND MANUFACTURING METHOD THEREOF

JFE Steel Corporation, T...

1. A welded steel pipe for a linepipe having the composition which contains by mass % 0.02 to 0.06% C, 0.01 to 0.5% Si, 0.8
to 1.6% Mn, 0.012% or less P, 0.0008% or less S, 0.01 to 0.08% Al, 0.005 to 0.050% Nb, 0.005 to 0.025% Ti, 0.0005 to 0.0035%
Ca, 0.0020 to 0.0060% N, and Fe and unavoidable impurities as a balance, wherein
C(%)?0.065Nb(%) is 0.025 or more,
a CP value is 0.95 or less,
a Ceq value is 0.28 or more,
Ti/N is a value which falls within a range of 1.5 to 4.0, and
the steel pipe has metal microstructure where a fraction of bainite is 80% or more, a fraction of martensite-austenite constituent
(MA) is 2% or less, and an average grain size of bainite is 5 ?m or less, wherein the CP value is expressed by the formula:

CP=4.46C(%)+2.37Mn(%)/6+{1.18Cr(%)+1.95Mo(%)+1.74V(%)}/5+{1.74Cu(%)+1.7Ni(%)}/15+22.36P(%); and

wherein the Ceq value is expressed by the formula:
Ceq=C(%)+Mn(%)/6+{Cr(%)+Mo(%)+V(%)}/5+{Cu(%)+Ni(%)}/15.

US Pat. No. 9,333,549

PRESS-FORMING MOLD DESIGNING METHOD AND PRESS-FORMING MOLD

JFE STEEL CORPORATION, T...

1. A press-forming mold designing method comprising:
providing a metal sheet workpiece having a sheet thickness t;
determining a minimum curvature radius R0 of a press-forming mold surface, the minimum curvature radius R0 satisfying the following equation:

R0/t?(2R/t+(2R/t+1)?f)/2(1?(1+2R/t)?f)

wherein:
?f is a critical strain for the occurrence of fracture in a plane strain region of an outwardly bent side of the metal sheet
workpiece, and

R is a critical bending radius defined as a minimum bending radius allowing the metal sheet workpiece to be bent without the
occurrence of fracture on an outwardly bent surface of the metal sheet workpiece; and

fabricating a press-forming mold having a punch, wherein a surface of the punch that is configured to contact the metal sheet
workpiece does not have any portion with a radius of curvature less than the minimum curvature radius R0.

US Pat. No. 9,341,599

ULTRASONIC FLAW DETECTION METHOD, ULTRASONIC FLAW DETECTION APPARATUS, AND PIPE MANUFACTURING METHOD

JFE Steel Corporation, (...

1. An ultrasonic flaw detection method to detect flaws on an inner surface of a metallic pipe using ultrasonic waves comprising:
a waveform holding step that acquires and holds waveform data of an echo signal when an ultrasonic probe that generates ultrasonic
signals toward the inner surface and the metallic pipe are moved relative to each other;

a signal analyzing step that calculates a path length up to receiving an echo signal from the inner surface and a change rate
of the path length based on the waveform data held; and

a flaw detecting step that detects flaws on the inner surface based on the path length and the change rate of the path length,wherein
the signal analyzing step further calculates a height of the echo signal from the inner surface based on the waveform data
held, and

the flaw detecting step determines that a flaw is present in a portion satisfying a condition in which the path length is
equal to or smaller than a given path length threshold, or a portion satisfying a condition in which the change rate of the
path length is equal to or greater than a given path-length change rate threshold and the height within a search range preset
with respect to a position of the change rate of the path length being equal to or greater than a given path-length change
rate threshold as a reference position is equal to or smaller than a given height threshold, and the flaw detecting step determines
that no flaw is present in a portion not satisfying the condition.

US Pat. No. 9,273,382

STAINLESS STEEL FOIL AND CATALYST CARRIER FOR EXHAUST GAS PURIFYING DEVICE USING THE FOIL

JFE Steel Corporation, (...

1. A stainless steel foil comprising: in percent by mass, 0.05% or less of C, 0.05 to 2.0% of Si, 1.0% or less of Mn, 0.003%
or less of S, 0.05% or less of P, more than 28% to 35.0% of Cr, 0.05% to 0.30% of Ni, 4.5% to 10.0% of Al, 0.10% or less of
N, 0.02% or less of Ti, 0.02% or less of Nb, 0.02% or less of Ta, 0.005% to 0.05% of Zr, 0.02% or less of Ce, 0.03% to 0.20%
of REM excluding Ce, 0.5% to 6.0% in total of at least one of Mo and W, and the balance being Fe and incidental impurities.
US Pat. No. 9,441,310

TIN-PLATED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A method of manufacturing a tin-plated steel sheet comprising:
forming an Sn-containing plating layer on at least one surface of a steel sheet so that the mass per unit area of Sn is 0.05
to 20 g/m2;

forming a first chemical conversion coating by immersing the steel sheet in a first chemical conversion solution containing
tetravalent tin ions and phosphate ions or cathodically electrolyzing the steel sheet in the first chemical conversion solution;

forming a second chemical conversion coating after forming the first chemical conversion coating without drying the steel
sheet by immersing the steel sheet in a second chemical conversion solution containing 5 to 200 g/L of aluminum phosphate
monobasic and having a pH of 1.5 to 2.4 or cathodically electrolyzing the steel sheet in the second chemical conversion solution;
and

drying the steel sheet.
US Pat. No. 9,284,618

HIGH STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A high strength hot-rolled steel sheet with a tensile strength of not less than 590 MPa which has a chemical composition
comprising, in terms of mass %, C at 0.040 to 0.10%, Si at not more than 0.3%, Mn at 1.7 to 2.5%, P at not more than 0.030%,
S at not more than 0.005%, Al at not more than 0.1% and N at 0.006 to 0.025%, with the balance being represented by Fe and
inevitable impurities, and has a microstructure in which a bainite phase represents not less than 60% on an area ratio basis,
a total of a ferrite phase and a pearlite phase represents not more than 10% on an area ratio basis, and the bainite phase
includes grains among which cementite grains have been precipitated at not less than 1.4×104 grains/mm2 and the cementite grains have an average grain diameter of not more than 1.5 ?m.

US Pat. No. 9,163,305

CONTINUOUS ANNEALING METHOD AND A MANUFACTURING METHOD OF HOT-DIP GALVANIZED STEEL STRIPS

JFE STEEL CORPORATION, T...

1. A continuous annealing method for steel strips, comprising annealing steel strips with a vertical annealing furnace in
which a heating zone for heating the steel strips while the steel strips are being transported upward and downward, a soaking
zone, and a cooling zone are disposed in this order;
wherein an atmosphere gas is supplied from outside of the furnace into the furnace;
wherein a gas in the furnace is discharged from a steel-strip entrance in a lower portion of the heating zone;
wherein a portion of the gas in the furnace is sucked and introduced into a refiner that is disposed outside of the furnace
and includes a deoxidation device and a dehumidification device to decrease a dew point of the gas through removal of oxygen
and water from the gas;

wherein the gas whose dew point has been decreased is returned into the furnace;
wherein the heating zone and the soaking zone are in communication with each other through an upper portion of the furnace;
wherein except for a communication region in the upper portion of the furnace, a partition wall is disposed so as to separate
an atmosphere of the heating zone from an atmosphere of the soaking zone;

wherein a connection part between the soaking zone and the cooling zone is disposed in the upper portion of the furnace;
wherein suction ports through which the gas in the furnace is sucked so as to be introduced into the refiner are disposed
in a portion of the cooling zone near the connection part between the soaking zone and the cooling zone and in an upper portion
of the soaking zone;

wherein feed ports through which the gas whose dew point has been decreased with the refiner is fed to the furnace are disposed
at least in the connection part between the soaking zone and the cooling zone and in a lower portion of the soaking zone;
and

wherein a gas suction rate Qo1 (Nm3/hr) in the portion of the cooling zone near the connection part between the soaking zone and the cooling zone, a gas suction
rate Qo2 (Nm3/hr) in the upper portion of the soaking zone, a gas feed rate Qi1 (Nm3/hr) in the connection part between the soaking zone and the cooling zone, a gas feed rate Qi2 (Nm3/hr) in the lower portion of the soaking zone, a supply rate Qf1 (Nm3/hr) of the atmosphere gas from outside of the furnace into the cooling zone and a zone subsequent to the cooling zone, a
supply rate Qf2 (Nm3/hr) of the atmosphere gas from outside of the furnace into the soaking zone, an internal volume Vs (m3) of the soaking zone, and an average furnace temperature Ts (° C.) of the soaking zone satisfy relationships represented
by formulae (1) to (4) below:

0.3×Qf1
0.5×(Qf2+Qi2+Qf1+Qi1?Qo1)
Qi1>Qo1?0.8×Qf1  (3)

Qi2>5×Vs×273/(273+Ts)  (4).

US Pat. No. 9,157,137

FERRITIC STAINLESS STEEL EXCELLENT IN OXIDATION RESISTANCE

JFE STEEL CORPORATION, T...

1. A ferritic stainless steel having a chemical composition containing, by mass %, C: 0.015% or less, Si: 0.40% or more and
1.00% or less, Mn: 1.00% or less, P: 0.040% or less, S: 0.010% or less, Cr: 15.3% or more and 23.0% or less, N: 0.015% or
less, Nb: 0.30% or more and 0.65% or less, Ti: 0.150% or less, Mo: 0.10% or less, W: 0.10% or less, Cu: less than 1.00%, Al:
0.20% or more and 1.00% or less, while the relationship mass % of Si mass % of Al is satisfied, and the balance being Fe and
inevitable impurities.

US Pat. No. 9,079,239

METHOD FOR MANUFACTURING EASY OPEN END

JFE Steel Corporation, T...

1. A method of manufacturing an easy open end, the method including the steps of using a laminated steel sheet with resin
films formed on both surfaces of the laminated steel sheet, and forming a panel structure and a score,
wherein a score die used for forming the score includes a scoring edge having a cross section in which a tip is a curve and
two sides with the tip interposed therebetween are tangent to the curve,

wherein the tip is the curve having a curvature radius ranging from 0.2 to 0.4 mm, and the two sides have elevation angles
? in a range of 0.3?tan ??1.0 to an end surface,

wherein the panel structure is formed by a motion that is synchronous with a motion in which the score die is pressed to a
surface of the laminated steel sheet during the formation of the score, such that a first time period during which the score
die is in contact with the surface of the laminated steel sheet overlaps with a second time period during which a press for
forming the panel structure is in contact with the surface of the laminated steel sheet, and

wherein the panel structure is formed to have an average distance h from a first surface of the laminated steel sheet to a
second surface of the laminated steel sheet in which the score is formed, with a portion of the panel structure connecting
the first surface and the second surface, and with the first surface and second surface being separated by the average distance
h.

US Pat. No. 9,234,254

HIGH-STRENGTH SEAMLESS STEEL TUBE, HAVING EXCELLENT RESISTANCE TO SULFIDE STRESS CRACKING, FOR OIL WELLS AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A seamless steel tube for oil wells, containing 0.15% to 0.50% C, 0.1% to 1.0% Si, 0.3% to 1.0% Mn, 0.015% or less P, 0.005%
or less S, 0.01% to 0.1% Al, 0.01% or less N, 0.1% to 1.7% Cr, 0.81% to 1.1% Mo, 0.01% to 0.12% V, 0.01% to 0.08% Nb, 0.0005%
to 0.003% B, 0.05% or less Ni, and 0.03% to 0.10% Cu on a mass basis, the remainder being Fe and unavoidable impurities, and
having a microstructure comprising a tempered martensite phase that is a main phase, prior-austenite grains with a grain size
number of 8.5 or more and 0.06% by mass or more of a dispersed M2C precipitate with substantially a particulate shape and Mo-concentrated regions located at boundaries between the prior-austenite
grains and which have a width of 1 nm to less than 2 nm, wherein the content of solute Mo is 0.40% or more on a mass basis
and content a of solute Mo and content ? of the M2C precipitate with substantially a particulate shape, satisfy inequality (1):
0.7??+3??1.2  (1)where ? is the content (mass percent) of solute Mo and ? is the content (mass percent) of the M2C precipitate.
US Pat. No. 9,200,343

HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A high strength steel sheet having a tensile strength of at least 1470 MPa and (tensile strength (TS)×total elongation
(T. EL)) of at least 29000 MPa·%, comprising a composition including by mass %,
C: 0.55% to 0.73%,
Si: 3.0% or less,
Al: 3.0% or less,
Si+Al: at least 0.7%,
Cr: 0.2% to 8.0%,
Mn: 10.0% or less,
Cr+Mn: at least 1.0%,
P: 0.1% or less,
S: 0.07% or less
N: 0.010% or less, and
remainder as Fe and incidental impurities,and having a microstructure satisfying conditions: area ratio of martensite with respect to the entire microstructure of 15%
to 90%; content of retained austenite of 10% to 50%, wherein at least 50% of said martensite is constituted of tempered martensite
and an area ratio of said tempered martensite with respect to the entire microstructure of the steel sheet is at least 10%;
and an area ratio of polygonal ferrite with respect to the entire microstructure of the steel sheet is 10% or less,
wherein average carbon concentration in said retained austenite is at least 0.7mass %.

US Pat. No. 9,194,031

TOOL FOR PIERCING MILL

JFE STEEL CORPORATION, T...

1. A tool for a piercing mill, the tool comprising a scale layer in a surface layer of a substrate steel, wherein the substrate
steel has a composition containing, on a mass % basis:
C: 0.05% to 0.5%,
Si: 0.1% to 1.5%,
Mn: 0.1% to 1.5%,
Cr: 0.1% to 1.5%,
Mo: 0.6% to 3.5%,
W: 0.5% to 3.5%, and
Nb: 0.1% to 1.0%,
and further containing Co: 0.5% to 3.5% and Ni: 0.5% to 4.0% so as to satisfy formula (1) below, with the balance being Fe
and incidental impurities;

wherein the scale layer includes a net structure scale layer that is formed on a substrate steel side, has a thickness of
10 to 200 ?m in a depth direction, and is complicatedly intertwined with a metal; and

wherein a microstructure on the substrate steel side in a range of at least 300 ?m in the depth direction from an interface
between the net structure scale layer and the substrate steel contains a ferrite phase at an area fraction of 50% or more,
the ferrite phase containing 400/mm2 or more of ferrite grains having a maximum length of 1 to 60 ?m,

1.0

US Pat. No. 9,187,798

METHOD FOR MANUFACTURING GRAIN ORIENTED ELECTRICAL STEEL SHEET

JFE STEEL CORPORATION, T...

1. A method for manufacturing a grain oriented electrical steel sheet, comprising the steps of:
subjecting a steel slab to heating and subsequent hot rolling to obtain a hot rolled steel sheet, the steel slab having a
composition containing by mass %, C: 0.020% to 0.15% (inclusive of 0.020% and 0.15%), Si: 2.5% to 7.0% (inclusive of 2.5%
and 7.0%), Mn: 0.005% to 0.3% (inclusive of 0.005% and 0.3%), acid-soluble aluminum: 0.01% to 0.05% (inclusive of 0.01% and
0.05%), N: 0.002% to 0.012% (inclusive of 0.002% and 0.012%), at least one of S and Se by the total content thereof being
0.05% or less, and the balance as Fe and incidental impurities;

subjecting the hot rolled steel sheet to hot-band annealing under conditions of soaking temperature of 800° C. to 1200° C.
(inclusive of 800° C. and 1200° C.) and soaking time of 2 seconds to 300 seconds (inclusive of 2 seconds and 300 seconds);
and

subjecting the hot rolled steel sheet to at least two cold rolling operations, which includes a final cold rolling, with intermediate
annealing therebetween to obtain a cold rolled steel sheet having a final sheet thickness; and

subjecting the cold rolled steel sheet to primary recrystallization annealing and then secondary recrystallization annealing,
wherein a thermal treatment is carried out after the hot-band annealing and prior to at least one of the cold rolling operations
so that the thermal treatment is not carried out immediately prior to the final cold rolling, wherein the thermal treatment
is carried out at a temperature in the range of 500° C. to 750° C. (inclusive of 500° C. and 750° C.) for a period in the
range of 10 minutes to 480 hours (inclusive of 10 minutes and 480 hours).

US Pat. No. 9,183,984

GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A grain oriented electrical steel sheet having a total length of cracks in a film on a steel sheet surface, of 20 ?m or
less per 10000 ?m2 of the film, wherein:
magnetic domain refinement interval D (mm) in a rolling direction of the steel sheet, provided in magnetic domain refinement
through substantially linear introduction of thermal strain from one side of the steel sheet corresponding to a winding outer
peripheral side of a coiled steel sheet at a stage of final annealing in a direction intersecting the rolling direction; and

deflection of 3mm or less per unit length: 500 mm in the rolling direction of the steel sheet,
wherein D satisfies:
0.5/(??/10)?D?1.0/(??/10),

?? (°) represents variation of angle ? (angle formed by <001> axis closest to the rolling direction, of crystal grain, with
respect to the steel sheet surface) per unit length: 10 mm in the rolling direction within a secondary recrystallized grain
of the steel sheet, and ??is 0.4° to 3.3°.

US Pat. No. 9,364,921

METHOD OF MANUFACTURING LASER WELDED STEEL PIPE

JFE STEEL CORPORATION, T...

1. A method of manufacturing a laser welded steel pipe by forming a steel strip into a cylindrical open pipe with forming
rolls and performing laser welding on edges of the open pipe by emitting a laser beam onto the edges of the open pipe while
pressing the edges with squeeze rolls, the method comprising:
emitting two laser beams along the edges from an upper surface side of the open pipe, the two laser beams being transmitted
through different optical fibers and having in-focus spot diameters exceeding 0.3 mm;

emitting the laser beams such that a leading laser beam of the two laser beams and a trailing laser beam of the two laser
beams are each inclined toward a direction in which welding proceeds at an incident angle with respect to a direction perpendicular
to an upper surface of the open pipe, the leading laser beam being ahead of the trailing laser beam on the upper surface of
the open pipe in the direction in which welding proceeds, the trailing laser beam being behind the leading laser beam on the
upper surface of the open pipe in the direction in which welding proceeds;

setting the incident angle of the leading laser beam to be larger than the incident angle of the trailing laser beam; and
setting a gap between a center point of the leading laser beam and a center point of the trailing laser beam on a back surface
of the open pipe to 1 mm or larger.

US Pat. No. 9,321,103

FINISH HEAT TREATMENT METHOD AND FINISH HEAT TREATMENT APPARATUS FOR IRON POWDER

JFE STEEL CORPORATION, T...

1. A finish heat treatment method for an iron powder comprising:
placing a raw iron powder on a continuous moving hearth;
subjecting the raw iron powder to a pretreatment of heating the raw iron powder in an atmosphere of a hydrogen gas and/or
an inert gas; and

then continuously subjecting the pretreated iron powder to at least two treatments selected from decarburization, deoxidation,
and denitrification to obtain a product iron powder, wherein:

the hydrogen gas and/or the inert gas is used as ambient gas in the pretreatment and is introduced separately from ambient
gas used in the at least two treatments, and

the hydrogen gas and/or the inert gas in the pretreatment is introduced from an upstream side of a region where the pretreatment
is performed and released from a downstream side of the region so that the gas flows in the same direction as a moving direction
of the continuous moving hearth.

US Pat. No. 9,044,920

HIGH STRENGTH GALVANIZED STEEL SHEET EXHIBITING EXCELLENT FATIGUE PROPERTY

JFE Steel Corporation, T...

1. A high strength galvanized steel sheet exhibiting excellent fatigue property, the steel sheet having a composition containing
by mass % 0.03 to 0.15% C, 2.00% or less Si, 1.0 to 2.5% Mn, 0.050% or less P, 0.0100% or less S, 0.050% or less Al, 0.0050%
or less N, 0.010 to 0.100% Ti, 0.010 to 0.100% Nb, 0.0010 to 0.0100% Sb, and Fe and unavoidable impurities as a balance, wherein
the microstructure includes a ferrite phase having an average grain diameter of 15 ?m or less and an area fraction of 60%
or more and a martensite phase having an area fraction of 5 to 40%, and

an amount of one or more kinds of oxide selected from a group consisting of Fe, Si, Mn, Al, P, Nb and Ti generated in a surface
layer portion of the steel sheet within a range from a surface of a base steel sheet directly below a galvanized layer to
100 ?m away from the surface in a direction of steel-sheet-side depth, an amount of all of the one or more oxides being less
than 0.060 g/m2 and more than 0g/m2 per one-side surface of the steel sheet.

US Pat. No. 9,321,119

COMBINATION WELDING METHOD USING COMBINATION OF GAS METAL ARC WELDING AND SUBMERGED-ARC WELDING AND COMBINATION ARC WELDING MACHINE

JFE Steel Corporation, T...

1. A combination welding method of performing gas metal arc welding on a butted portion between steel plates and performing
submerged-arc welding behind the gas metal arc welding, the method comprising:
welding a back side of the butted portion;
welding a finishing side of the butted portion by gas metal arc welding, the gas metal arc welding step using:
two or more electrodes;
a wire having a diameter of 1.4 mm or more in a first electrode of the gas metal arc welding; and
a current density of the first electrode from 320 A/mm2 to 700 A/mm2; and

welding the finishing side by submerged-arc welding behind the gas metal arc welding of the finishing side such that a distance
between a last electrode of the gas metal arc welding and a first electrode of the submerged-arc welding is from 40 to 100
mm, and such that the submerged-arc welding is conducted before a melted metal of the gas metal arc welding is completely
solidified,

wherein the heat of the gas metal arc welding is deeply input in the thickness direction of a steel plate, the heat of the
submerged-arc welding is input to a surface layer side thereof, and an upside of weld metal formed by the gas metal arc welding
is melted again by the submerged-arc welding.

US Pat. No. 9,396,872

GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A grain oriented electrical steel sheet comprising: a forsterite film, a tension coating on a surface of the steel sheet,
and linear grooves for magnetic domain refinement on a surface of the steel sheet, wherein
the steel sheet has a sheet thickness of 0.30 mm or less,
the linear grooves are located at intervals of 2 to 10 mm in a rolling direction,
depth of each of the linear grooves is 10 ?m or more,
thickness of the forsterite film at bottom portions of the linear grooves is 0.3 ?m or more,
total tension applied to the steel sheet by the forsterite film and the tension coating is 10.0 MPa or higher in the rolling
direction, and

a proportion of eddy current loss in iron loss W17/50 of the steel sheet is 65% or less when an alternating magnetic field of 1.7 T and 50 Hz is applied to the steel sheet in the
rolling direction.

US Pat. No. 9,260,774

METHOD FOR MANUFACTURING HOT DIP GALVANIZED STEEL SHEET

JFE Steel Corporation, T...

1. A method for manufacturing a hot dip galvanized steel sheet comprising: subjecting a steel sheet to hot dip galvanizing
and subsequent temper rolling; bringing the steel sheet into contact with acidic solution having pH buffering capacity; retaining
the steel sheet for 1 second to 60 seconds after the contact with the acidic solution; and rinsing the steel sheet with water,
to form a zinc oxide layer on a coating surface of the steel sheet, wherein the method further comprising:
carrying out the temper rolling by either rolling the steel sheet first with a dull roll having Ra?2.0 ?m at rolling reduction
rate ?5% and then with a bright roll having R?0.1 ?m at rolling reduction rate ?3% or rolling the steel sheet first with a
bright roll having Ra?0.1 ?m at rolling reduction rate ?3% and then with a dull roll having Ra?2.0 ?m at rolling reduction
rate 5%.

US Pat. No. 9,200,352

HIGH STRENGTH GALVANNEALED STEEL SHEET WITH EXCELLENT APPEARANCE AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A high strength galvannealed steel sheet comprising:
a steel sheet having a recrystallized ferrite phase structure; and
a galvannealed coating on the surface of the steel sheet,
the steel sheet having a composition containing
0.0005% to 0.0040% by mass of C;
0.1% to 1.0% by mass of Si;
1.0% to 2.5% by mass of Mn;
0.01% to 0.20% by mass of P;
0.015% or less by mass of S;
0.01% to 0.10% by mass of Al;
0.0005% to 0.0040% by mass of N;
0.010% to 0.080% by mass of Ti;
0.0005% to 0.0020% by mass of B;
0.05% to 0.50% by mass of Cu;
0.03% to 0.50% by mass of Ni;
0.0030% to 0.0150% by mass of Sb; and
the balance of Fe and incidental impurities,
the composition satisfying Relationships (1) and (2):
[Ti]?(47.9/14)×[N]+(47.9/12)×[C]  (1); and
[Ni]?0.4×[Cu]  (2),
wherein [element] represents content (percent by mass) of the element, and
wherein the high strength galvannealed steel sheet has a tensile strength (TS) of 440 MPa to 490 MPa and a yield strength
(YS) of 306 to 340 MPa.

US Pat. No. 9,387,527

METHOD AND APPARATUS FOR HOT-ROLLING METAL STRIP USING NEAR-INFRARED CAMERA

JFE Steel Corporation, T...

1. A method for detecting a low-temperature portion of a hot-rolled metal strip, the method comprising:
arranging a near-infrared camera at at least one position selected from an entry side of a coiler of a hot-rolling line, a
midway point of a run-out table, and a delivery side of a finishing mill;

arranging a spot thermometer at the at least one position;
measuring a luminance of a portion of a heat source with the near-infrared camera;
measuring a temperature of the portion of the heat source with the spot thermometer;
storing in a computer a luminance-temperature conversion curve showing a relationship between the luminance measured with
the near-infrared camera and the temperature measured with the spot thermometer for the portion of the heat source;

obtaining an image of an entire width of a hot-rolled metal strip with the near-infrared camera at the at least one position;
converting a luminance in the image obtained with the near-infrared camera into a temperature using the luminance-temperature
conversion curve; and

detecting a low-temperature portion of the hot-rolled metal strip based on the converted temperature for downstream removal
of a defective quality portion corresponding to the detected low-temperature portion of the hot-rolled metal strip.

US Pat. No. 9,200,344

HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT BENDABILITY AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A high strength hot rolled steel sheet with excellent bendability, which has a composition comprising, in terms of mass
%, C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.0030%, Al at 0.005
to 0.10%, N at not more than 0.005% and Ti at 0.03 to 0.13%, the balance being represented by Fe and inevitable impurities,
includes surface regions having an area fraction of bainite of less than 80% and an area fraction of a ferrite phase with
a grain diameter of 2 to 15 ?m of not less than 10%, the surface regions extending from front and back surfaces of the steel
sheet each to a depth of 1.5 to 3.0% relative to a total sheet thickness, as well as an inner region other than the surface
regions having an area fraction of a bainite phase of more than 95%, and has a tensile strength of not less than 780 MPa,
wherein the total sheet thickness is from 8.0 mm or less to 1.8 mm or more, and a minimum bending radius without occurrence
of a crack defined as a critical bending radius R in mm, divided by the total sheet thickness t in mm given as an R/t value,
is from 0.5 or less to 0.17 or more.
US Pat. No. 9,169,577

SURFACE-TREATED STEEL SHEET, METHOD FOR MANUFACTURING THE SAME, AND RESIN-COVERED STEEL SHEET USING THE SAME

JFE Steel Corporation, T...

1. A method for manufacturing a surface-treated steel sheet, comprising forming a corrosion-resistant coating comprising at
least one layer selected from a Ni layer, a Sn layer, an Fe—Ni alloy layer, an Fe—Sn alloy layer, and an Fe—Ni—Sn alloy layer
on at least one side of a steel sheet; and forming an adherent coating by cathode electrolytic treatment in an aqueous solution
containing Zr in a concentration of 0.008 to 0.07 mol/L (L: liter) and at least one species selected from phosphoric acids
and phenolic resins in a total molar ratio to Zr of 0.01 to 10 under electrolysis conditions where a current is used that
varies between a current density at which Zr precipitates and a current density at which no Zr precipitates at a period of
0.01 to 0.4 second and that remains within a current density range where no Zr precipitates for 0.02 to 0.05 seconds per period,
and the number of cycles is 10 or more, wherein the upper limit of the current density range where no Zr precipitates depends
on the composition and pH of the aqueous solution used for the cathode electrolytic treatment.

US Pat. No. 9,279,172

HEAT-RESISTANCE FERRITIC STAINLESS STEEL

JFE Steel Corporation, T...

1. A ferritic stainless steel, comprising: C: 0.015 mass % or less, Si: 1.0 mass % or less, Mn: 1.0 mass % or less, P: 0.04
mass % or less, S: 0.010 mass % or less, Cr: 16 to 23 mass %, N: 0.015 mass % or less, Nb: 0.3 to 0.65 mass %, Ti: 0.002 to
0.15 mass %, Mo: 0.1 mass % or less, W: present in an amount up to and including 0.1 mass %, Cu: 1.0 to 2.5 mass %, Al: 0.2
to 1.5 mass %, Ni: 0.05 to 0.5%, V: present in an amount up to 0.5%, and a balance of Fe and inevitable impurities, and having
an oxidation weight gain of 27 g/m2 or less when held for 300 hours in atmospheric air heated to 950° C. in a furnace.

US Pat. No. 9,410,218

METHOD FOR OPERATING A BLAST FURNACE

JFE Steel Corporation, (...

1. A method of operating a blast furnace comprising:
providing two or more lances that inject reducing agents from a tuyere;
injecting a solid reducing agent and a flammable reducing agent from different lances; and
arranging an end of the lance that injects the flammable reducing agent upstream in the tuyere relative to an end of the lance
that injects the solid reducing agent by a distance between more than 0 mm and less than or equal to 50 mm.

US Pat. No. 9,330,839

GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A grain oriented electrical steel sheet comprising a forsterite film formed on a surface thereof, being subjected to strain
introduction by an electron beam and having a magnetic flux density B8 of 1.92 T or higher,
wherein a ratio (Wa/Wb) of a film thickness of the forsterite film on a strain-introduced side of the steel sheet (Wa) to
a film thickness of the forsterite film on a non-strain-introduced side of the steel sheet (Wb) is 0.5 or higher, and

wherein a magnetic domain discontinuous portion in a surface of the steel sheet on the strain-introduced side has an average
width in a direction at right angles to a longitudinal direction of the magnetic domain discontinuous portion of 150 to 300
?m, and a magnetic domain discontinuous portion in a surface of the steel sheet on the non-strain-introduced side has an average
width in a direction at right angles to a longitudinal direction of the magnetic domain discontinuous portion of 250 to 500
?m.

US Pat. No. 9,309,586

HIGH-STRENGTH GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A method for manufacturing a high-strength galvanized steel sheet including a zinc plating layer, having a mass per unit
area of 20 g/m2 to 120 g/m2, disposed on a steel sheet containing 0.01% to 0.18% C, 0.02% to 2.0% Si, 1.0% to 3.0% Mn, 0.001% to 1.0% Al, 0.005% to 0.060%
P, and 0.01% or less S on a mass basis, the remainder being Fe and unavoidable impurities, the method comprising:
annealing and galvanizing the steel sheet in a continuous galvanizing line equipped with an all-radiant tube-type furnace,
wherein the steel sheet is not oxidized prior to annealing, and

setting the temperature of the all-radiant tube-type furnace such that the furnace temperature reaches a temperature region
of A° C. and a temperature region of B° C. during the annealing and galvanizing process,

wherein the annealing and galvanizing is performed at an atmosphere dew-point temperature of ?5° C. or higher when the furnace
temperature is in the regions of A° C. and B° C., and

wherein the atmosphere dew-point temperature is ?50° C. to ?10° C. when the furnace temperature is outside the regions of
A° C. and B° C.,

where 600?A?780 and 800?B?900.

US Pat. No. 9,216,446

DESCALING NOZZLE FOR REMOVING SCALE FROM STEEL SHEET, DESCALING APPARATUS FOR REMOVING SCALE FROM STEEL SHEET, AND DESCALING METHOD FOR REMOVING SCALE FROM STEEL SHEET

JFE STEEL CORPORATION, T...

10. A descaling apparatus for removing scale from a steel sheet, the steel sheet being a material that is rolled in a rolling
process, the descaling apparatus comprising:
a plurality of descaling nozzles disposed above and below the steel sheet, wherein:
the descaling apparatus removes the scale from a surface of the steel sheet that is to be rolled by spraying high pressure
water from the descaling nozzles onto the surface of the steel sheet that is to be rolled, and

each of the descaling nozzles includes:
a discharge section at a distal end of the nozzle, the discharge section including a main flow orifice and a branch flow orifice;
and

a large diameter portion that forms a cylindrical channel, wherein:
the main flow orifice and the branch flow orifice are each commonly connected to the large diameter portion, and
the branch flow orifice is configured to discharge a part of water flow from the large diameter portion so that cavitation
occurs at a boundary between the part of water flow discharged from the branch flow orifice and water flow that is discharged
from the main flow orifice.

US Pat. No. 9,315,887

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND METHOD FOR PRODUCING SAME

JFE Steel Corporation, (...

1. A method for producing a high-strength hot-dip galvanized steel sheet including a steel sheet containing, in percent by
mass, 0.01% to 0.18% of C, 0.02% to 2.0% of Si, 1.0% to 3.0% of Mn, 0.001% to 1.0% of Al, 0.005% to 0.060% of P, 0.01% or
less of S, and the balance being Fe and incidental impurities, and a galvanized coating layer on each surface of the steel
sheet with a coating weight of 20 to 120 g/m2 per surface, the method comprising, when the steel sheet is subjected to annealing and a hot-dip galvanizing treatment in
a continuous hot-dip galvanizing line, controlling a dew point of the atmosphere to ?40° C. or lower in every a region of
the annealing furnace that has a temperature range higher than 780° C.
US Pat. No. 9,073,292

HIGH STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A high strength galvanized steel sheet having excellent formability, comprising a steel sheet which is a base sheet and
a galvanized layer on a surface of the steel sheet, wherein the steel sheet is a high strength steel sheet which has a composition
comprising, by mass %,
0.08 to 0.15% of C, 0.5 to 1.5% of Si,
0.5 to 1.5% of Mn, 0.1% or less of P,
0.01% or less of S, 0.01 to 0.1% of Al,
0.005% or less of N, and
the balance Fe with inevitable impurities, and a microstructure composed of 75 to 90% of a ferrite phase as a main phase and
10 to 25% of a second phase including at least pearlite in terms of an area fraction with respect to the entire microstructure;
an average grain size of the pearlite is 5 ?m or smaller; and the pearlite has an area fraction of 70% or greater with respect
to the total area of the second phase.

US Pat. No. 9,466,411

NON-ORIENTED ELECTRICAL STEEL SHEET

JFE Steel Corporation, (...

1. A non-oriented electrical steel sheet comprising a chemical composition consisting essentially of, in mass %,
C: 0.005% or less, Si: 5% or less, Al: 3% or less, Mn: 5% or less, S: 0.005% or less, P: 0. 2% or less, N: 0.005% or less,
Mo: 0.001 to 0.04%, and one or both of Sb and Sn: 0.001 to 0.1% in total;

optionally one or more of Ca: 0.001 to 0.01%, Mg: 0.0005 to 0.005% and REM: 0.001 to 0,05%:
optionally Cr: 0.4 to 5%:
optionally one or both of Ni: 0.1 to 5% and Co: 0.1 to 5%; and
the balance being iron and incidental impurities,
wherein W19/100 of the non-oriented electrical steel sheet is equal to or lower than 8.60 W/kg.

US Pat. No. 9,365,915

FERRITIC STAINLESS STEEL

JFE Steel Corporation, T...

1. Ferritic stainless steel having a chemical composition containing, by mass %, C: 0.005% to 0.020%, Si: 3.0% or less, Mn:
3.0% or less, P: 0.040% or less, S: 0.030% or less, Cr: 10% to 25%, N: 0.006% to 0.020%, Nb: 0.005% to 0.08%, Al: less than
0.20%, Ti: 5×(C %+N %) to 0.5%, Mo: 0.1% or less, W: 0.1% or less, Cu: 0.55% to 2.0%, B: 0.0002% to 0.0050%, Ni: 0.05% to
1.0%, and the balance being Fe and inevitable impurities, where C % and N % in the expression 5×(C %+N %) respectively represent
the contents (mass %) of the chemical elements C and N, wherein the ferritic stainless steel exhibits a weight gain by oxidation
of less than 50 g/m2.

US Pat. No. 9,429,374

RAIL COOLING METHOD

JFE STEEL CORPORATION, T...

1. A rail cooling method for performing forced cooling on a head and a foot of a hot-rolled rail, the rail cooling method
comprising:
calculating an estimated amount of warp at an ambient temperature, based on a formula, that is a regression value obtained
by regression calculations using temperatures including (1) a head cooling start temperature Th0, (2) a head cooling end temperature Th1, (3) a foot cooling start temperature Tf0, and (4) a foot cooling end temperature Tf1, wherein the formula is expressed as: the estimated amount of warp at the ambient temperature=?1.06Th0+4.02Th1+2.59Tf0?2.86Tf1+constant;

measuring an actual amount of warp of the rail that is a warp that the rail actually has when the rail is cooled to the ambient
temperature after a forced cooling;

calculating, based on a relation between the actual amount of warp and the estimated amount of warp at the ambient temperature,
a target value or a target value range for each of the temperatures Th0, Th1, Tf0, Tf1 such that an amount of warp of the rail at a normal temperature falls within a permissive range; and

setting a cooling condition in accordance with the target value or the target value range to perform the forced cooling on
the head and the foot.

US Pat. No. 9,499,875

CONTINUOUS ANNEALING DEVICE AND CONTINUOUS HOT-DIP GALVANISING DEVICE FOR STEEL STRIP

JFE STEEL CORPORATION, C...

1. A steel strip continuous annealing device that has a vertical annealing furnace in which a heating zone, a soaking zone,
and a cooling zone are arranged in the stated order, and anneals a steel strip passing through the zones in the order while
being conveyed in a vertical direction in the vertical annealing furnace,
wherein adjacent zones communicate with each other through a communicating portion that connects upper parts or lower parts
of the respective zones,

a communicating portion between the heating zone and the soaking zone connects lower parts of the respective zones, and a
communicating portion between the soaking zone and the cooling zone connects upper parts of the respective zones,

a gas delivery port is provided in each of the heating zone, the soaking zone, and the cooling zone, and
the gas delivery port in the heating zone is provided only in an upper part of the heating zone, and the gas delivery port
in each of the soaking zone and the cooling zone is provided only in a position opposite in the vertical direction to a position
of a communicating portion with an immediately preceding zone in the order in which the steel strip passes through.

US Pat. No. 9,470,345

THREADED JOINT FOR PIPES

JFE Steel Corporation, T...

1. A threaded joint for pipes comprising:
a pin including an externally threaded portion and a nose extending from the externally threaded portion toward an end of
a pipe; and

a box including an internally threaded portion and an inner peripheral face of a nose, the internally threaded portion forming
a threaded portion by being threadedly connected with the externally threaded portion, the inner peripheral face of the nose
facing an outer peripheral face of the nose of the pin,

wherein, when the pin and the box are threadedly connected with each other and the outer peripheral face of the nose of the
pin and the inner peripheral face of the nose of the box come into metal-to-metal contact with each other in a radial direction
at a contact portion, the contact portion serves as a seal portion,

wherein a coating including Cu—Sn alloy coating or Cr coating and having a Vickers hardness greater than or equal to 310 and
less than or equal to 700 exists on the threaded portion of the box and an inner face of the box corresponding to the seal
portion, and

wherein a seal interference amount ratio ?/D of the seal portion in a pipe circumferential direction is greater than or equal
to 0.002, where D is a seal diameter defined as an outside diameter of the pin at a seal point that is a point on the outer
peripheral face of the nose of the pin at which the outer peripheral face first comes into contact with the inner peripheral
face of the nose of the box and ? is an interference amount defined as an amount by which the outside diameter at the seal
point is reduced by the box when the pin and the box are threadedly connected with each other.

US Pat. No. 9,394,595

HIGH CARBON THIN STEEL SHEET AND METHOD FOR PRODUCING SAME

JFE STEEL CORPORATION, T...

1. A high carbon steel sheet having a chemical composition containing C: 0.20% to 0.50%, Si: 1.0% or less, Mn: 2.0% or less,
P: 0.03% or less, S: 0.02% or less, sol.Al: 0.08% or less, N: 0.02% or less, and the remainder composed of Fe and incidental
impurities, on a percent by mass basis, and a microstructure composed of ferrite and cementite, wherein the fraction of pro-eutectoid
ferrite, among the ferrite, in the whole steel microstructure is 20% or more and less than 50%, the average grain size dc
of the cementite in the region from the position at one-quarter of the sheet thickness of the steel sheet to the sheet thickness
center is 0.50 to 1.5 ?m, and the average grain size ds of the cementite in the region from the surface of the steel sheet
to the position at one-quarter of the sheet thickness satisfies ds/dc?0.8.
US Pat. No. 9,321,246

COLD ROLLED STEEL SHEET

JFE Steel corporation, T...

1. A cold rolled steel sheet comprising, on a surface thereof, an organic-inorganic composite film containing: an organic
resin; and a crystalline layered material, wherein the organic-inorganic composite film has an average film thickness of 0.10
to 2.0 ?m and contains 0.5 part or more by weight of the crystalline layered material as a solid with respect to 100 parts
by weight of a solid of the organic resin,
wherein the crystalline layered material is a layered double hydroxide represented by [M2+1-xM3+x(OH)2][An?]x/n.zH2O, wherein:

M2+ is one or more of Mg2+, Ca2+, Fe2+, Ni2+, Zn2+, Pb2+, and Sn2+;

M3+ is one or more of Al3+, Fe3+, Cr3+, 3/4Zr4+, and Mo3+; and

An? is one or more of (C2O4)2?, I?, (BrO3)?, (IO3)?, (V10O28)6?, (Si2O5)2?, (ClO4)?, (CH3COO)?, [C6H4(CO2)2]2?, (C6H5COO)?, [C8H16(CO2)2]2?, n(C8H17SO4)?, n(C12H25SO4)?, n(C18H37SO4)?, and SiO44?,

wherein 0 wherein a base material of the cold rolled steel sheet has a strength exceeding 440 MPa.

US Pat. No. 9,551,047

HIGH-STRENGTH ELECTRIC-RESISTANCE-WELDED STEEL PIPE OF EXCELLENT LONG-TERM SOFTENING RESISTANCE IN INTERMEDIATE TEMPERATURE RANGES

JFE Steel Corporation, (...

1. A high strength electric resistance welded pipe having a longitudinally extending seam of an electric resistance weld zone,
a base metal of the pipe having a chemical composition containing, by mass %,
C: 0.025% or more and 0.084% or less, Si: 0.10% or more and 0.30% or less,
Mn: 0.70% or more and 1.90% or less, P: 0.018% or less,
S: 0.0029% or less, Al: 0.01% or more and 0.10% or less,
Nb: 0.001% or more and 0.070% or less, V: 0.001% or more and 0.065% or less,
Ti: 0.001% or more and 0.033% or less, Ca: 0.0001% or more and 0.0035% or less,
N: 0.0050% or less, O: 0.0030% or less
and the balance being Fe and inevitable impurities, in which a condition that Pcm defined by equation (1) below is 0.20 or
less is satisfied, having a microstructure in the base metal portion including, in terms of volume percentage, 90% or more
of a quasi-polygonal ferrite phase as a main phase and the balance being hard phases other than the quasi-polygonal ferrite
phase in which the quasi-polygonal ferrite phase has an average grain diameter of 10 ?m or less, having a microstructure in
an electric resistance weld zone including, in terms of volume percentage, 90% or more of a quasi-polygonal ferrite phase
as a main phase and the balance being hard phases other than the quasi-polygonal ferrite phase, in which the quasi-polygonal
ferrite phase has an average grain diameter of 10 ?m or less, and having a yield strength YS of 450 MPa or more:

Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B  (1),where C, Si, Mn, Cu, Ni, Cr, Mo, V and B represent the contents (mass %) of chemical elements respectively represented by
the corresponding atomic symbols.
US Pat. No. 9,534,136

MAGNETIC STEEL SHEET WITH SEMI-ORGANIC INSULATION COATING

JFE Steel Corporation, (...

1. A magnetic steel sheet having on a surface thereof a semi-organic insulation coating comprising an inorganic component
and an organic resin, wherein the inorganic component of the semi-organic insulation coating comprises a Zr compound, an Si
compound containing a plate-like silica, and a B compound as a ratio in a dry coating of 20-70 mass % of the Zr compound (converted
to ZrO2), 10-50 mass % of the Si compound containing the plate-like silica (converted to SiO2), and 0.1-5 mass % of the B compound (converted to B2O3), and the remainder of the semi-organic insulation coating is the organic resin,
the Zr compound includes at least one of ammonium zirconium carbonate, potassium zirconium carbonate, zirconium acetate, zirconium
sulfate, zirconium nitrate and potassium zirconium hexafluoride,

the B compound is boric acid, and
the organic resin includes at least one of epoxy resin, polyester resin, acryl resin and urethane resin.

US Pat. No. 9,145,594

METHOD FOR MANUFACTURING ULTRA HIGH STRENGTH MEMBER

JFE Steel Corporation, (...

1. A method for manufacturing an ultra high strength member comprising:
heating a steel sheet at a first heating temperature within a temperature range of 700 to 1000° C.;
forming the steel sheet into a shape of a member at the first heating temperature and simultaneously cooling the steel sheet;
after completion of the cooling, shear punching the steel sheet into a desired shape to obtain an ultra high strength member;
after the shear punching, subjecting the ultra high strength member to a first heat treatment including heating the ultra
high strength member at a second heating temperature within a temperature range of 100° C. or higher and 150° C. or lower,
and retaining the member at the second heating temperature for 1 second to 60 minutes;

after the first heat treatment, cooling the ultra high strength member; and
after the cooling, subjecting the ultra high strength member to a second heat treatment including reheating the ultra high
strength member at a third heating temperature within a temperature range of 150° C. or higher, but lower than 300° C. and
retaining the member at the third heating temperature for 1 second to 10 minutes,

wherein the resulting ultra high strength member has a tensile strength of 1180 MPa or more.

US Pat. No. 9,506,132

METHOD FOR MANUFACTURING HEAVY WALL STEEL PIPE

JFE STEEL CORPORATION, T...

1. A method for manufacturing a heavy wall steel pipe, the method comprising:
dipping a steel pipe having a wall thickness of ½ inch or more in water, the steel pipe having been heated to a gamma range,
the dipping including supporting and rotating the steel pipe about an axis of the steel pipe at a circumferential velocity
of pipe of 4 m/s or more;

applying an axial stream comprising a water flow in a direction of the axis of the steel pipe to an inside surface of the
steel pipe under rotation in the water, a pipe flow velocity of the axial stream being 7 m/s or more; and

applying an impinging stream comprising a water flow in a direction of a diameter of the steel pipe impinging on an outer
surface of the steel pipe under rotation in the water, a discharge flow velocity of the impinging stream being 9 m/s or more,

wherein the application of each of the axial stream and the impinging stream are started within 1.1 s after the entire steel
pipe is dipped in the water and continued until the temperature of the steel pipe is decreased to 150° C. or lower, and

the direction of the diameter of the steel pipe is perpendicular to the direction of the axis of the steel pipe.

US Pat. No. 9,506,127

METHOD FOR PRODUCING SINTERED ORE

JFE STEEL CORPORATION, T...

1. A method for producing a sintered ore, the method comprising:
charging a sintering raw material including powder ore and carbon material onto a circularly moving pallet to form a charged
layer;

igniting the carbon material on a surface of the charged layer;
supplying a gaseous fuel from a plurality of gaseous fuel supplying devices installed downstream of an ignition furnace in
a machine length direction, a total amount of supply of the gaseous fuel supplied from the gaseous fuel supplying devices
being set to be constant;

sucking air above the charged layer using a wind box disposed below the pallet and introducing the air into the charged layer,
the air including the gaseous fuel;

increasing or decreasing an amount of supply of the gaseous fuel supplied from each gaseous fuel supplying device depending
on an amount of air sucked into the charged layer in a region in which each gaseous fuel supplying device is installed; and

combusting the gaseous fuel and the carbon material within the charged layer to produce the sintered ore.

US Pat. No. 9,358,581

HOT-DIP GALVANIZED STEEL SHEET AND METHOD FOR PRODUCING THE SAME

JFE Steel Corporation, T...

1. A method for producing a hot-dip galvanized steel sheet, the method comprising:
applying a surface treatment agent with a pH of 4 to 5 to a hot-dip galvanized steel sheet having a Ra of 0.5 to 2.0 ?m and
a PPI of 150 or more; and

drying the surface treatment agent at an ultimate sheet temperature of 50° C. to 180° C. to form a surface treatment coating
film having a coating weight of 0.2 to 1.0 g/m2 on the surface of the steel sheet, the surface treatment agent containing:

(A) a resin compound having a bisphenol skeleton represented by general formula (I) described below (hereinafter referred
to as “resin compound (A)”);

(B) a cationic urethane resin emulsion having at least one cationic functional group selected from primary to tertiary amino
groups and quaternary ammonium bases (hereinafter referred to as “cationic urethane (B)”);

(C) at least one silane coupling agent having at least one reactive functional group selected from an active hydrogen-containing
amino group, an epoxy group, a mercapto group, and a methacryloxy group;

(D) an organic titanium chelate compound;
(E) a tetravalent vanadyl compound; and
(F) water,
wherein the solid content of the cationic urethane (B) is 0.10 to 0.30 in terms of ratio by mass [(b)/{(a)+(b)+(c)}] relative
to the total solid content of the resin compound (A), the cationic urethane (B), and the silane coupling agent (C);

the solid content of the silane coupling agent (C) is 0.60 to 0.85 in terms of ratio by mass [(c)/{(a)+(b)+(c)}] relative
to the total solid content of the resin compound (A), the cationic urethane (B), and the silane coupling agent (C);

the solid content of the silane coupling agent (C) is 50 to 70 in terms of ratio by mass [(c)/Ti] relative to the content
of the organic titanium chelate compound (D) in terms of titanium; and

the content of the tetravalent vanadyl compound (E) in terms of vanadium is 0.30 to 0.50 in terms of ratio by mass (V/Ti)
relative to the content of the organic titanium chelate compound (D) in terms of titanium;

Ra represents arithmetic mean roughness according to JIS B 0601-1994, and PPI represents the number of peaks per 25.4 mm (1
inch) according to SAEJ911 determined from a roughness curve according to JIS B 0601-1994; and

in each of the equations, (a) represents the solid content of the resin compound (A); (b), the solid content of the cationic
urethane (B); (c), the solid content of the silane coupling agent (C); Ti, the content of the organic titanium chelate compound
(D) in terms of titanium; and V, the content of the tetravalent vanadyl compound (E) in terms of vanadium;

wherein in the formula (I), Y1 and Y2 bonded to benzene rings are each independently a hydrogen atom or a Z group represented by general formula (II) or (III) below,
the average number of Z groups substituted per benzene ring is 0.2 to 1.0, and n represents an integer of 2 to 50;
wherein in the formulae (II) and (III), R1, R2, R3, R4, and R5 each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a hydroxyalkyl group having 1
to 10 carbon atoms, and A? represents a hydroxide ion or an acid ion.

US Pat. No. 9,205,475

UOE STEEL PIPE AND STRUCTURE

JFE Steel Corporation, (...

1. A UOE steel pipe used to form a structure by performing butt circumferential welding and having an outside diameter shape
in a waveform in a longitudinal direction, wherein
the outside diameter shape in the waveform is an outer shape with continuous larger-diameter parts and smaller-diameter portions,
and

minimum diameter parts of the smaller-diameter portions are arranged outside a range of 2.26? to 3.86? where ? is an initial
buckling half-wavelength of the UOE steel pipe from both longitudinal end portions of the UOE steel pipe.

US Pat. No. 9,162,272

CLOSED STRUCTURE PARTS, METHOD AND PRESS FORMING APPARATUS FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A method of manufacturing a closed structure part having a closed section using a blank made from a metal plate by pressing
the blank using a press forming die and fixing a pair of joint ends of the blank to each other, the method comprising:
a pre-forming step of processing the blank into an interim part having a cross section corresponding to the closed structure
part;

a closing step of, after the pre-forming step is completed, moving the joint ends of the interim part toward each other and
urging, against one of the joint ends, a concave flange processing portion formed in an upper end portion of one of a pair
of press forming surfaces of the press forming die wherein each of the press forming surfaces is connected to each other at
an edge end adjacent to the other press forming surface and the press forming surfaces extend downward from the connected
edge ends;

wherein the concave flange processing portion linearly extends in the depth direction of the press forming die along a portion
of the one of a pair of press forming surfaces and a bottom surface of the concave flange processing portion is substantially
parallel to and adjacent to the one of a pair of press forming surfaces extending from the lower edge of the flange processing
portion; and

a press joining step of, after the closing step is completed, further moving the press forming die in a pressing direction,
bending the one of the joint ends using a pressing force applied from the flange processing portion so that the joint end
overlaps an outer surface of the other joint end and a latch flange portion that latches the other joint end is formed and,
simultaneously, pressing the blank using the connected pair of press forming surfaces and press-forming outer portions of
the pair of the joint ends of the blank into final predetermined shapes with overlapping joint ends.

US Pat. No. 9,102,892

METHOD FOR PREPARING COAL FOR COKE MAKING

JFE STEEL CORPORATION, T...

1. A method for preparing coal for coke making, the method comprising adjusting a permeation distance of an individual coal
brand to a specified value or less when the coal brand is prepared as a material to be used for coke making by itself or by
being blended with other coal brands.

US Pat. No. 9,858,714

SHAPE OPTIMIZATION ANALYZING METHOD AND APPARATUS THEREFOR

JFE Steel Corporation, T...

1. A method of forming an automotive steel-sheet structure, comprising:
a design-space defining step of defining a design space by eliminating a desired part of plane elements and/or three-dimensional
elements which form a structure model of the automotive steel-sheet structure;

an optimization-block-model generating step of connecting nodes located on a side of the design space with straight lines
to form a reference surface, and extruding the reference surface in a desired direction to generate an optimization block
model in the defined design space to extend along surfaces of the structure model that define the design space in such a manner
that the optimization block model is formed of three-dimensional elements including any of pentahedrons, hexahedrons, heptahedrons,
and octahedrons, each three-dimensional element having multiple pairs of parallel surfaces and being positioned such that
one of the multiple pairs of parallel surfaces having a largest area is oriented parallel to a surface having a largest area
among all surfaces of the design space;

a coupling step of coupling the generated optimization block model with the structure model;
an analyzing step of performing analysis in accordance with input of an analytic condition to calculate an optimal shape of
the optimization block model; and

a structure forming step of forming the automotive steel-sheet structure in accordance with the calculated optimal shape of
the optimization block model.

US Pat. No. 9,845,439

METHOD FOR BLENDING COALS FOR COKEMAKING AND METHOD FOR PRODUCING COKE

JFE STEEL CORPORATION, T...

1. A method for blending coals for cokemaking, comprising:
determining a percentage of each of a plurality of coals to be blended, based on a difference between surface tensions of
semicokes prepared from each of the plurality of coals; and

blending the plurality of coals according to the percentages.
US Pat. No. 9,536,657

GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A grain oriented electrical steel sheet having a forsterite coating on a surface thereof, subjected to magnetic domain
refinement by laser irradiation and having a magnetic flux density B8 of at least 1.91T, wherein a nitrogen content in the forsterite coating is 3.0 mass % or less, and a standard deviation of
forsterite grain size in the forsterite coating is equal to or less than 1.0 time as much as an average of the forsterite
grain size.

US Pat. No. 9,340,740

METHOD FOR EVALUATING THERMAL PLASTICITY OF COALS AND CAKING ADDITIVES, AND METHOD FOR PRODUCING COKE

JFE STEEL CORPORATION, T...

1. A method for evaluating thermal plasticity of coals and caking additives, comprising:
packing a coal or a caking additive into a vessel to prepare a sample,
arranging a through-hole material having through-holes from top to bottom surfaces, onto the sample,
heating the sample while maintaining the sample and the through-hole material in a constant volume,
measuring the permeation distance with which the molten sample has permeated into the through-holes, and
evaluating thermal plasticity of the sample using the measured value.

US Pat. No. 9,214,275

METHOD FOR MANUFACTURING GRAIN ORIENTED ELECTRICAL STEEL SHEET

JFE STEEL CORPORATION, T...

1. A method for manufacturing a grain oriented electrical steel sheet, the method comprising:
preparing a steel slab having a composition comprising:
C: 0.08% or less, by mass %;
Si: 2.0% to 8.0%, by mass %;
Mn: 0.005% to 1.0%, by mass %;
at least one type of inhibitor selected from AlN, in which the composition further comprises Al: 0.01% to 0.065%, by mass
% and N: 0.005% to 0.012%, by mass %, MnS, in which the composition further comprises S: 0.005% to 0.03%, by mass %, and MnSe,
in which the composition further comprises Se: 0.005% to 0.03%, by mass %; and

Fe and incidental impurities;
rolling the steel slab to obtain a steel sheet having a final sheet thickness; and
subjecting the steel sheet to, in order, decarburization annealing, coating with annealing separator mainly composed of MgO,
and final annealing,

wherein the decarburization annealing is carried out as continuous annealing, the continuous annealing comprising:
(1) heating the steel sheet to a temperature in the range of 700° C. to 750° C. at a heating rate of 50° C./second or higher
at least in a temperature range of 500° C. to 700° C. in an atmosphere having oxidation potential P(H2O)/P(H2) equal to or
lower than 0.05;

(2) then cooling the steel sheet to a temperature in the range of 400° C. to below 700° C. in an atmosphere having oxidation
potential P(H2O)/P(H2) equal to or lower than 0.05; and

(3) reheating the steel sheet to a temperature in the range of 800° C. to 900° C. and retaining the steel sheet at the temperature
for soaking in an atmosphere having oxidation potential P(H2O)/P(H2) equal to or higher than 0.3.

US Pat. No. 9,624,563

STAINLESS STEEL FOIL AND CATALYST CARRIER FOR EXHAUST GAS PURIFYING DEVICE USING THE FOIL

JFE Steel Corporation, T...

1. A stainless steel foil comprising, in percent by mass, 0.05% or less of C, 2.0% or less of Si, 1.0% or less of Mn, 0.003%
or less of S, 0.05% or less of P, more than 15.0% and less than 25.0% of Cr, 0.05% or more and 0.30% or less of Ni, 3.0% to
10.0% of Al, 0.03% to 1.0% of Cu, 0.10% or less of N, 0.02% or less of Ti, 0.02% or less of Nb, 0.02% or less of Ta, 0.005%
to 0.20% of Zr, 0.03% to 0.20% of REM excluding Ce, 0.02% or less of Ce, 4.5% to 6.0% of at least one of Mo and W, and the
balance being Fe and incidental impurities.
US Pat. No. 9,352,393

IRON-BASED POWDER FOR POWDER METALLURGY

JFE STEEL CORPORATION, T...

1. Iron-based powder for powder metallurgy, wherein either or both of an alloy component and a cutting ability improving agent
are adhered to a surface of an iron powder for powder metallurgy by a binder with a melting point of 150° C. or lower, carbon
black is adhered to a surface of the binder, and an amount of free binder is 0.02 mass % or less.
US Pat. No. 9,212,411

HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A high-strength steel sheet comprising a composition containing, in mass percent, 0.08% to 0.20% of carbon, 0.2% to 1.0%
of silicon, 0.5% to 2.5% of manganese, 0.04% or less of phosphorus, 0.005% or less of sulfur, 0.05% or less of aluminum, 0.07%
to 0.20% of titanium, and 0.30% to 0.80% of vanadium, the balance being iron and incidental impurities, and having a metallographic
structure comprising 80% to 98% by volume of a ferrite phase and a second phase, wherein a sum of amounts of titanium and
vanadium contained in precipitates having a size of less than 20 nm is 0.150% by mass or more, and a difference (HV??HVS) between hardness (HV?) of the ferrite phase and hardness (HVS) of the second phase is ?300 to 300.
US Pat. No. 9,127,366

ZINC-BASED METAL COATED STEEL SHEET

JFE Steel Corporation, T...

1. A zinc-based metal coated steel sheet comprising:
a surface film arranged on a surface of a zinc-based metal coated layer, the surface film having a two-layer structure including
a first layer and a second layer,

wherein the first layer is formed by applying a surface treatment liquid (A) for a zinc-based metal coated steel sheet to
the surface of the zinc-based metal coated layer and performing drying by heating, the surface treatment liquid (A) containing
a resin emulsion (a) that contains a cationic urethane resin emulsion (a-1) and/or a nonionic acrylic resin emulsion (a-2),
the cationic urethane resin emulsion (a-1) containing at least one cationic functional group selected from primary to tertiary
amino groups and quaternary ammonium salt groups, a tetraalkoxysilane (b), at least one silane coupling agent (c) that contains
at least one reactive functional group selected from active hydrogen-containing amino groups, an epoxy group, a mercapto group,
and a methacryloxy group, a chelating agent (d), a vanadic acid compound (e), a titanium compound (f), and water, the surface
treatment liquid (A) having a pH of 3 to 6 and being adjusted so as to satisfy requirements (I) to (V) described below, wherein
the second layer is formed by applying a surface treatment liquid (B) that contains an organic resin (g) to a surface of the
first layer and performing drying by heating, and wherein the total thickness of the first layer and the second layer on a
side of the steel sheet is in the range of 0.1 to 3.0 ?m:

(I) the proportion of the solid (aS) of the resin emulsion (a) is in the range of 11% to 45% by mass with respect to the total solid of the treatment liquid;

(II) the ratio by mass of the solid of the silane coupling agent (c) to the solid of the resin emulsion (a), i.e., (cS/aS), is in the range of 1.51 to 5.35;

(III) the ratio by mass of the solid of the tetraalkoxysilane (b) to the solid of the chelating agent (d), i.e., (bS/dS), is in the range of 0.15 to 1.49;

(IV) the ratio of the mass (eV) of the vanadic acid compound (e) in terms of V to the mass of the solid (dS) of the chelating agent (d), i.e., (eV/dS), is in the range of 0.03 to 0.23; and

(V) the ratio of the mass (fT) of the titanium compound (f) in terms of Ti to the mass of the solid (dS) of the chelating agent (d), i.e., (fT/dS), is in the range of 0.02 to 0.19.

US Pat. No. 9,657,873

THREADED JOINT FOR PIPES

JFE STEEL CORPORATION, T...

1. A threaded joint for steel pipes, comprising:
a pin that includes an externally threaded portion, a nose extending from the externally threaded portion to a pipe end, and
a shoulder portion provided at a distal end of the nose, the externally threaded portion extending from an original pipe portion
that includes an unprocessed portion having no threads, the unprocessed portion being adjacent to the externally threaded
portion on a side of the externally threaded portion that is opposite the nose; and

a box that includes an internally threaded portion, a sealing surface, and a shoulder portion, wherein:
the pin and the box are configured to be joined together such that the internally threaded portion is attached to the externally
threaded portion to form the threaded joint,

when the internally threaded portion and the externally threaded portion form the threaded joint:
(i) the sealing surface faces an outer circumferential surface of the nose,
(ii) the shoulder portion of the pin is in contact with the shoulder portion of the box, and
(iii) the pin and the box are joined so that the outer circumferential surface of the nose and the sealing surface are in
metal-to-metal contact thereby forming a seal portion, the seal portion including a seal point that is the first portion of
the pin that comes into contact with the sealing surface when the internally threaded portion and the externally threaded
portion are brought together to form the threaded joint,

the outer circumferential surface of the nose has an outward convex curved shape, and the sealing surface has a tapered shape,
the position of the seal point on the pin is set so that a straight line connecting an inside end of the shoulder portion
of the pin and the seal point, in a joint axial cross-sectional view, forms an angle (?) with respect to the joint axis such
that angle (?) is 15 degrees or more and less than 45 degrees,

a cross-sectional area of the pin at the seal point is 35% or more of the cross-sectional area of the unprocessed portion,
and

a distance (x) from a thread distal end to the seal point relative to a length (L) of the nose from the thread distal end
to a distal end of the nose is in the range from 0.2 to 0.8.

US Pat. No. 9,637,826

STEEL SHEET FOR CONTAINERS AND MANUFACTURING METHOD FOR SAME

JFE STEEL CORPORATION, T...

1. A steel sheet for containers providing highly-formed film adhesiveness, having:
a chemical conversion coating which is formed by immersing or electrolytically treating a steel sheet in a solution containing
Zr ions, F ions and P ions, the adhesion amount of which is within a range of 4 mg/m2 to 83 mg/m2 as an amount of metal Zr and 0.01 mg/m2 or less as an amount of F and 1 mg/m2 to 45 mg/m2 as an amount of P; and

a glycolic acid-treated layer which is formed on the chemical conversion coating, and the adhesion amount of which is within
a range of 3 mg/m2 to 45 mg/m2 as an amount of C.

US Pat. No. 9,587,297

FERRITIC STAINLESS STEEL EXCELLENT IN CORROSION RESISTANCE AND CONDUCTIVITY AND METHOD FOR MANUFACTURING THE SAME, SEPARATOR OF PROTON-EXCHANGE MEMBRANE FUEL CELL AND PROTON-EXCHANGE MEMBRANE FUEL CELL

JFE STEEL CORPORATION, T...

1. A ferritic stainless steel having a chemical composition containing, by mass %, C: 0.001% or more and 0.05% or less, Si:
0.001% or more and 0.5% or less, Mn: 0.001% or more and 1.0% or less, Al: 0.001% or more and 0.5% or less, N: 0.001% or more
and 0.05% or less, Cr: 17% or more and 23% or less, Mo: 0.08% or less and the balance being Fe and inevitable impurities,
the ferritic stainless steel comprising a passivation film on a surface of the stainless steel,
wherein the film is obtained by immersing the stainless steel in a solution for an immersion treatment, the solution mainly
containing hydrofluoric acid or a liquid mixture of hydrofluoric acid and nitric acid such that in the solution, the relationship
represented by the following expression (1) is satisfied:

[HF]?[HNO3]  (1)

([HNO3] includes zero)

where [HF] denoted the concentration of hydrofluoric acid (mass %) and [HNO3] denotes the concentration of nitric acid (mass %).

US Pat. No. 9,580,785

HIGH-STRENGTH GALVANNEALED STEEL SHEET HAVING EXCELLENT FORMABILITY AND FATIGUE RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A method for manufacturing a 700 MPa or more high-strength galvannealed steel sheet having excellent formability and fatigue
resistance, the method comprising:
hot-rolling a slab to produce a hot-rolled sheet having a microstructure in which a total area ratio of bainite and martensite
is 80% or more, the slab having, by % by mass, C: 0.05% to 0.3%, Si: 0.5% to 2.5%, Mn: 1.0% to 3.5%, P: 0.003% to 0.100%,
S: 0.02% or less, Al: 0.010% to 0.1%, and the balance including iron and unavoidable impurities;

cold-rolling the hot-rolled sheet to produce a cold-rolled steel sheet;
continuously annealing the cold-rolled steel sheet by heating to 750° C. to 900° C. at an average heating rate of 8° C./s
or more from 500° C. to an A1 transformation point, holding the steel sheet for 10 seconds or more, and then cooling the steel sheet to a temperature region
of 300° C. to 530° C. at an average cooling rate of 3° C. is or more from 750° C. to 530° C.;

galvanizing the steel sheet; and
further coating-alloying the steel sheet in a temperature region of 540° C. to 600° C. for 5 to 60 seconds.

US Pat. No. 9,512,331

SURFACE TREATMENT AGENT FOR ZINC OR ZINC ALLOY COATED STEEL SHEET, ZINC OR ZINC ALLOY COATED STEEL SHEET, AND METHOD OF PRODUCING THE STEEL SHEET

JFE STEEL CORPORATION, T...

1. A surface treatment agent for a zinc or zinc alloy coated steel sheet, comprising:
(A) resin compound having a bisphenol skeleton represented by general formula (I) below;
(B) cationic urethane resin emulsion having at least one type of cationic functional group selected from primary amine, secondary
amine, tertiary amine or quaternary ammonium salt;

(C) at least one type of silane coupling agent having at least one type of reactive functional group selected from active
hydrogen-containing amino group, epoxy group, mercapto group armor methacryloxy group;

(D) organic titanium chelate compound;
(E) quadrivalent vanadyl compound;
(F) molybdic acid compound; and
(G) water,such that conditions (1) to (5) below are satisfied, pH of the surface treatment agent being in the range of 4 to 5,
wherein: (1) [(Bs)/{(As)+(Bs)+(Cs)}] as a mass ratio of solid content (Bs) of the cationic urethane resin emulsion (B) with respect to total solid content {(As)+(Bs)+(Cs)} of the resin compound (A), the cationic urethane resin emulsion (B) and the silane coupling agent (C) is in the range of
0.1 to 0.3;

(2) [(Cs)/{(As)+(Bs)+(Cs)}] as a mass ratio of solid content (Cs) of the silane coupling agent (C) with respect to total solid content {(As)+(Bs)+(Cs)} of the resin compound (A), the cationic urethane resin emulsion (B) and the silane coupling agent (C) is in the range of
0.6 to 0.85;

(3) {(Cs)/(DTi)} as a mass ratio of solid content (Cs) of the silane coupling agent (C) with respect to mass content (DTi) in terms of titanium of the organic titanium chelate compound (D) is in the range of 50 to 70;

(4) {(EV)/(DTi)} as a mass ratio of mass content (EV) in terms of vanadium of the quadrivalent vanadyl compound (E) with respect to mass content (DTi) in terms of titanium of the organic titanium chelate compound (D) is in the range of 0.3 to 0.5;

(5) [(FMo)/{(As)+(Bs)+(Cs)}] as a mass ratio of mass content (FMo) in terms of molybdenum of the molybdic acid compound (F) with respect to total solid content {(As)+(Bs)+(Cs)} of the resin compound (A), the cationic urethane resin emulsion (B) and the silane coupling agent (C) is in the range of
0.003 to 0.03;

in formula (I), Y1 and Y2 bonded to benzene rings, respectively, are each independently hydrogen or group z represented by general formula (II) or (III)
below, the average substitution number of the group z per benzene ring is in the range of 0.2 to 1.0, and n represents integer
in the range of 2 to 50:
in formula (II) and formula (III), R1, R2, R3, R4 and R5 each independently represent hydrogen atom, C1-10 alkyl group or C1-10 hydroxyalkyl group, and A? represents hydroxyl ion or acid ion.

US Pat. No. 9,493,868

ALUMINUM OR ALUMINUM ALLOY-COATED STEEL MATERIAL AND METHOD OF MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. An aluminum alloy-coated steel material, comprising:
base steel; and
a coating layer formed on a surface of the base steel and consisting of by mass % Mg: 6% to 10%, Si: 3% to 7%, Fe: 0.2% to
2%, Mn: 0.02% to 2%, and the balance as Al and incidental impurities,

wherein molar ratios Mg/Si, Mn/Fe, and Mg2Si/Al of the coating layer satisfy 1.7?Mg/Si?2.3, 0.1?Mn/Fe?1.0, and Mg2Si/Al?1, respectively, and

the coating layer has pseudoternary eutectic microstructures of ?Al—Mg2Si—(Al—Fe—Si—Mn) and an area ratio of the pseudoternary eutectic microstructures in the coating layer is at least 30%.

US Pat. No. 9,396,850

GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A grain oriented electrical steel sheet having a forsterite coating, tension coating and magnetic flux density B8 of 1.91T or more and subjected to magnetic domain refinement by laser irradiation, wherein:
(1) a content of Cr mixed into the grain oriented electrical steel sheet is 0.01 mass % or more and 0.1 mass % or less;
(2) a coating weight of the forsterite coating, in terms of basis weight of oxygen therein, is at least 3.0 g/m2, an anchor portion is formed as a lower portion of the forsterite coating, biting a base metal of the grain oriented electrical
steel sheet, and thickness of the anchor portion is 0.2 ?m or more and 1.5 ?m or less; and

(3) a magnitude of deflection due to the forsterite coating of the grain oriented electrical steel sheet is at least 10 mm
and a magnitude of deflection due to the forsterite coating and the tension coating of the grain oriented electrical steel
sheet is at least 20 mm, when the grain oriented electrical steel sheet has length: 280 mm.

US Pat. No. 9,243,334

METHOD AND APPARATUS FOR MANUFACTURING SI-CONTAINING COLD ROLLED STEEL SHEETS

JFE STEEL CORPORATION, T...

1. A method for manufacturing Si containing cold rolled steel sheets with excellent chemical conversion properties, comprising
steps of:
cold rolling a steel sheet containing 0.5 to 3.0 mass % Si, continuously annealing the cold rolled steel sheet, pickling a
surface of the continuously annealed cold rolled steel sheet, and repickling the surface of the pickled steel sheet with a
non-oxidative acid,

wherein the repickling is performed such that:
a repickling solution is sampled continuously or periodically;
an acid concentration in the sampled solution is measured; and
the acid concentration in the repickling solution is regularly controlled within a prescribed concentration range.

US Pat. No. 9,234,680

SOLAR LIGHT REFLECTING PLATE AND LIGHT COLLECTING/HEAT COLLECTING DEVICE

JFE Steel Corporation, (...

6. A light condensing and heat collecting device including a solar light reflecting plate having a bent to a predetermined
curvature radius and reflecting and condensing solar light and a heat collecting tube positioned on the focal point that receives
the solar light condensed by the solar light reflecting plate and is heated by the condensed solar light, wherein
(1) the solar light reflecting plate comprises at least a rolled substrate,
(2) in the solar light reflecting plate, surface roughness of a solar light reflecting surface that is an outermost surface
and that reflects the solar light is from 0.02 ?m to 1.0 ?m range in terms of arithmetic mean roughness Ra, and

(3) the solar light reflecting plate is disposed so that an angle between a rolling direction of the substrate and a longitudinal
direction of the heat collecting tube is from 80° to 100° range.

US Pat. No. 9,170,052

LOWER VESSEL OF RH DEGASSER

JFE STEEL CORPORATION, T...

1. A lower vessel of an RH degasser where a bottom portion having two circulating flow tubes is lined with a plurality of
bottom part refractories, and an inner surface of a side wall is lined with a plurality of side-wall refectories, wherein:
the plurality of bottom part refractories include center part refractories which are arranged at a center part sandwiched
between two circulating flow tubes, arrangement refractories which are contiguously arranged with the center part refractories,
and are arranged along an intersecting direction which intersects a line which passes the center part and connects two circulating
flow tubes in a horizontal cross-sectional view of the bottom part, connection refractories which are arranged at positions
where at least a portion of each of the connection refractories overlaps with a vertically downward projection view of the
side-wall refractories, and other bottom part refractories which are arranged at other bottom portion positions,

of the connection refractories, at least the connection refractories which are arranged contiguously with the arrangement
refractories are formed of two or more force transmission refractories per row, which are arranged toward the arrangement
refractories from the side-wall refractories, and

the force transmission refractories are configured such that, to convert a load in the vertical direction from the side wall
refractories into a force in the lateral direction, opposedly facing surfaces of the force transmission refractories at least
at a position between the neighboring force transmission refractories in a row are inclined such that upper portions of the
opposedly facing surfaces are positioned more inside of the bottom portion than lower portions of the opposedly facing surfaces
are positioned.

US Pat. No. 9,945,015

HIGH-TENSILE STEEL PLATE GIVING WELDING HEAT-AFFECTED ZONE WITH EXCELLENT LOW-TEMPERATURE TOUGHNESS, AND PROCESS FOR PRODUCING SAME

JFE Steel Corporation, T...

1. A high-tensile steel plate giving welding heat-affected zone with excellent low-temperature toughness, the high-tensile steel plate comprising a chemical composition containing, by mass, C: 0.05% to 0.14%, Si: 0.01% to 0.30%, Mn: 0.3% to 2.3%, P: 0.008% or less, S: 0.005% or less, Al: 0.22% to 0.1%, Ni: 0.5% to 4%, B: 0.0003% to 0.003%, N: 0.001% to 0.008%, Ceq (=[C]+[Mn]/6+[Cu+Ni]/15+[Cr+Mo+V]/5, each element symbol represents the content (mass %) of the element)?0.80, a center-segregation zone hardness index HCS satisfying Expression (1), and the balance being Fe and inevitable impurities, wherein the hardness of a center-segregation zone in the steel plate satisfies Expression (2),HCS=5.5[C]4/3+15[P]+0.90[Mn]+0.12[Ni]+0.53[Mo]?2.5  (1)
where each [M] represents the content (mass %) of the element,
HVmax/HVave?1.35+0.006/C?t/750  (2)where HVmax represents a maximum Vickers hardness of the center-segregation zone, HVave represents an average Vickers hardness of a portion that does not include the center-segregation zone and that does not include regions extending from both surfaces to ¼ of the thickness of the steel plate, C represents the content (mass %) of carbon, and t represents a thickness (mm) of the steel plate.
US Pat. No. 9,809,869

THICK-WALLED HIGH-STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT HYDROGEN INDUCED CRACKING RESISTANCE AND MANUFACTURING METHOD THEREOF

JFE Steel Corporation, T...

1. A method of manufacturing a thick-walled high-strength hot rolled steel sheet having surface layer hardness of 230HV or
less in terms of Vickers hardness, wherein in manufacturing a hot rolled steel sheet by applying hot rolling consisting of
rough rolling and finish rolling to a raw steel material having a composition which contains by mass % 0.02 to 0.08% C, 1.0%
or less Si, 0.50 to 1.85% Mn, 0.03% or less P, 0.005% or less S, 0.1% or less Al, 0.02 to 0.10% Nb, 0.001 to 0.05% Ti, 0.0005%
or less B, and Fe and unavoidable impurities as a balance, such that the composition satisfies the following formula: (Ti+Nb/2)/C<4,
where Ti, Nb, and C are contents of the respective elements by mass %, and after the finish rolling is finished, a first cooling
step in which the hot rolled steel sheet is cooled by accelerated cooling at an average surface cooling rate of 30° C./s or
more until a surface temperature becomes 500° C. or below, a second cooling step in which the hot rolled steel sheet is cooled
by air cooling for 10 s or less after the first cooling step is finished, and a third cooling step in which the hot rolled
steel sheet is cooled by accelerated cooling to a temperature which falls within a temperature range from 350° C. or above
to a temperature below 600° C. at the center of a sheet-thickness at an average cooling rate of 10° C./s or more at the center
of the sheet-thickness are applied to the hot rolled steel sheet, and the hot rolled steel sheet is coiled in a coil shape
after the third cooling step is finished.

US Pat. No. 9,505,362

SHOCK-ABSORBING MEMBER

JFE STEEL CORPORATION, T...

1. A shock-absorbing member comprising:
a tubular main body portion having an outer surface, an inner surface opposite the outer surface, and a hollow interior cavity
defined by the inner surface;

a bent portion that is formed continuous with the main body portion; and
a flange provided at a proximal end of the main body portion via the bent portion,
wherein the main body portion is configured to undergo eversion deformation by a shock power acting on a distal end of the
main body portion so that a shock energy is absorbed,

wherein the main body portion has a regular polygonal cross-section orthogonal to an axial direction, and has a tapered shape
that an area of the cross-section orthogonal to the axial direction decreases toward the distal end

wherein the main body portion has linear grooves extending in the axial direction provided in side walls of the main body
portion at regular intervals, the linear grooves being indented to a depth from the outer surface of the main body portion
into the hollow interior cavity of the main body portion, and

the depth of the linear grooves decreases continuously from the proximal end of the main body portion toward the distal end
of the main body portion.

US Pat. No. 9,506,131

STEEL SHEET FOR AEROSOL CAN BOTTOM HAVING HIGH PRESSURE RESISTANCE AND EXCELLENT WORKABILITY AND METHOD FOR PRODUCING SAME

JFE STEEL CORPORATION, T...

1. A steel sheet for the bottom of aerosol cans with high resistance to pressure and high formability, the steel sheet having
a chemical composition containing, by mass %, C: 0.02% or more and 0.10% or less, Si: 0.01% or more and 0.5% or less, P: 0.001%
or more and 0.100% or less, S: 0.001% or more and 0.020% or less, N: 0.007% or more and 0.025% or less, Al: 0.01% or more
and {?4.2×N (%)+0.11}% or less and {3.0×N (%)}% or less, and Nf is 0.65 or more where Nf is defined by equation Nf={N?N as
AlN}/N, where N in the equation denotes the N content (mass %) in the steel and N as AlN denotes the content (mass %) of N
which is present in the steel in the form of AlN, Mnf: 0.10% or more and less than 0.30% where Mnf is defined by equation
Mnf=Mn?1.71×S, where Mn and S in the equation respectively denote the contents (mass %) of Mn and S in the steel, and the
balance being Fe and inevitable impurities,
wherein the steel sheet has a thickness of 0.35 mm or less, has a product of a lower yield point (N/mm2) of the steel sheet and the thickness (mm) that is 160 (N/mm) or less, and has a product of a upper yield point (N/mm2) of the steel sheet which is observed after performing an aging treatment at room temperature under conditions of a temperature
of 25° C. and a duration of 10 days after giving a tensile prestrain of 10% to the steel sheet and a square of the thickness
(mm) that is 52.0 (N) or more.

US Pat. No. 9,498,810

METHOD FOR MANUFACTURING WARM PRESSED-FORMED MEMBERS

JFE Steel Corporation, T...

1. A method for manufacturing warm press-formed members, comprising heating a steel sheet to a temperature in the range from
200 to 800° C. and warm press-forming the steel sheet at a temperature in the above range of temperatures, the steel sheet
having a lower coating layer and a Zn—Ni alloy coating layer in this order on the surface of the steel sheet, the lower coating
layer including not less than 60 mass % Ni and the balance being Zn and inevitable impurities and having a coating weight
of 0.01 to 5 g/m2, the Zn—Ni alloy coating layer including 10 to 25 mass % Ni and the balance being Zn and inevitable impurities and having
a coating weight of 10 to 90 g/m2.
US Pat. No. 9,290,834

HIGH-STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND CRASHWORTHINESS

JFE Steel Corporation, T...

1. A high-strength galvanized steel sheet having excellent formability and crashworthiness, comprising a substrate and a galvanized
layer provided on a surface of the substrate, wherein the substrate has a composition containing, by mass %,
C: 0.05% or more and 0.5% or less, Si: 0.01% or more and 2.5% or less, Mn: 0.5% or more and 3.5% or less, P: 0.003% or more
and 0.100% or less, S: 0.02% or less, Al: 0.010% or more and 0.5% or less, B: 0.0002% or more and 0.005% or less, Ti: 0.05%
or less, a relationship of Ti>4N being satisfied, and the balance comprising Fe and inevitable impurities, and a microstructure
containing 60% or more and 95% or less of tempered martensite in terms of area ratio and 5% or more and 20% or less of retained
austenite in terms of area ratio, the tempered martensite having an average grain diameter of 5 ?M or less.

US Pat. No. 9,821,407

FRICTION STIR WELDING METHOD FOR STRUCTURAL STEEL AND METHOD OF MANUFACTURING JOINT FOR STRUCTURAL STEEL

JFE Steel Corporation, (...

1. A friction stir welding method for structural steel comprising:
inserting a rotational tool into an unwelded portion of steel sheets or plates, the rotational tool comprising a shoulder
and a pin disposed on the shoulder and sharing an axis of rotation with the shoulder, at least the shoulder and pin being
made of a material harder than the steel sheets or plates as working materials;

moving the rotational tool in a welding direction while rotating the tool so that the steel sheets or plates are softened
by frictional heat generated between the rotational tool and the steel sheets or plates, and a plastic flow is generated by
the softened part being stirred by the rotational tool, and the steel sheets or plates are welded; and

heating at least one of the steel sheets or plates with a heating unit provided ahead of the rotational tool moving in the
welding direction, wherein

when a part of the steel sheets or plates with a temperature Ts (° C.) of a surface of the steel sheets or plates satisfying
TS?0.8×TA1, where TA1 is represented by Formula (1), due to the heating is defined as a heating region,

a minimum distance between a heating region and the rotational tool in the surface of the steel sheets or plates is equal
to or smaller than the diameter of the shoulder of the rotational tool,

an area of the heating region in the surface of the steel sheets or plates is equal to or smaller than a cross-sectional area
of a maximum diameter part of the pin of the rotational tool, and

60% or more of the area of the heating region is positioned between a welding center line and a straight line parallel to
the welding center line, the welding center line being a straight line passing through the axis of rotation of the rotational
tool in the surface of the steel sheets or plates and is parallel to the welding direction and the straight line parallel
to the welding center line being separated from the welding center line toward an advancing side by a distance corresponding
to the maximum radius of the pin of the rotational tool,

TA1(° C.)=723?10.7[% Mn]?16.9[% Ni]+29.1[% Si]+16.9[% Cr]+290[% As]+6.38[% W]  (1)

wherein the content of the element is in the steel sheets or plates as working materials.

US Pat. No. 9,809,884

METHOD FOR MANUFACTURING GALVANIZED STEEL SHEET

JFE STEEL CORPORATION, T...

1. A method for manufacturing a galvanized steel sheet that includes an oxide layer on the surface thereof, comprising:
an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution for 1 to 60 seconds,
and then washing the galvanized steel sheet with water; and

a neutralization treatment step of bringing a surface of an oxide layer, formed in the oxide layer forming step, into contact
with an alkaline aqueous solution for 0.5 seconds or more, washing the surface of the oxide layer with water, and drying the
surface of the oxide layer;

wherein the alkaline aqueous solution contains 0.01 g/L or more of P ions and 0.01 g/L or more of colloid dispersed particles.
US Pat. No. 9,617,614

METHOD FOR MANUFACTURING HIGH STRENGTH STEEL SHEET HAVING EXCELLENT FORMABILITY

JFE Steel Corporation, (...

1. A method of manufacturing a high strength steel sheet having excellent formability comprising:
preparing a steel slab having a chemical composition containing C: 0.03% to 0.35%, Si: 0.5% to 3.0%, Mn: 3.5% to 10.0%, P:
0.100% or less, S: 0.02% or less, and the remainder comprising Fe and incidental impurities on a percent by mass basis;

hot-rolling the steel slab;
subjecting the hot rolled steel sheet to a heat treatment in which an achieved temperature of Ac1 to Ac1+100° C. is held for 3 minutes or more;

cold-rolling the steel sheet subjected to the heat treatment at a rolling reduction of 20% or more; and
subjecting the cold rolled steel sheet to annealing in which an achieved temperature of Ac1?30° C. to Ac1+100° C. is held for 1 minute or more.

US Pat. No. 9,574,254

HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME

JFE Steel Corporation

1. A hot rolled steel sheet having a chemical composition including, by mass %, C: 0.060% to 0.120%; Si: 0.10% to 0.70%; Mn:
1.00% to 1.80%; P: 0.10% or less; S: 0.010% or less; Ai: 0.01% to 0.10%; N: 0.010% or less; Nb: 0.010% to 0.100%, wherein
Nb is included so that content of solute Nb is 25% or more relative to the total Nb content; and the balance including Fe
and incidental impurities,
the steel sheet further having a microstructure with complex phase wherein ferrite with an average crystal grain diameter
within a range of not less than 3 pm to not more than 15 pm is contained at a volume fraction of not less than 75%, the balance
comprising low-temperature-induced phases.

US Pat. No. 9,506,152

RESIN COATED METAL SHEET

JFE Steel Corporation, (...

1. A resin coated metal sheet comprising:
a metal sheet;
a first resin coating layer formed on one main surface of the metal sheet and formed of a resin material whose difference
between a heat quantity of crystallization and a heat quantity of fusion after being laminated to the metal sheet is 6 J/g
to 20 J/g on a unit weight basis; and

a second resin coating layer formed on another main surface of the metal sheet, wherein
the first and the second resin coating layers are formed of a resin material containing 90 mol % or more ethylene terephthalate
unit, and

a melting point of the first resin coating layer is 240° C. to 254° C.

US Pat. No. 9,493,854

CONVERTER STEELMAKING METHOD

JFE Steel Corporation, (...

1. A converter steelmaking method of producing molten steel by supplying gaseous oxygen from a top blowing lance into a converter
to perform decarburization refining of molten iron while adding a CaO-containing powdery dephosphorizing agent to simultaneously
decarburize and dephosphorize the molten iron, comprising:
joining the dephosphorizing agent and the gaseous oxygen together in the same lance;
supplying the dephosphorizing agent to a bath surface of the molten iron together with at least one gas jet from the top blowing
lance; and

controlling a dynamic pressure determined from formulae (1)-(4) including an increasing amount of dynamic pressure due to
a kinetic energy of the dephosphorizing agent when a gas jet including the gaseous oxygen accompanied by the dephosphorizing
agent blown from respective lance nozzles of the top blowing lance impinges onto the bath surface of the molten iron to be
not less than 0.10 kgf/cm2 and not more than 0.50 kgf/cm2:

P=3.13×10?11×?g×(U0×de×P0/Lh)2  (1)

U0=740(1?(1.033/P0)2/7)1/2  (2)

P0=Fj/(0.456×dt2)  (3)

?g=?j+Vp/(Fj/60)  (4),
wherein
P: dynamic pressure at a center of the jet exerted on the bath surface of the molten iron by the gas jet blown from the lance
nozzle [kgf/cm2]

?g: density of the gas jet [kg/Nm3]

U0: velocity of the gas jet blown from the lance nozzle [m/sec]

de: outlet diameter of the lance nozzle [mm]
P0: pressure at nozzle inlet of the gas blown from the lance nozzle [kgf/cm2]

Lh: lance height [m]
Fj: supply rate of the gas blown from the lance nozzle [Nm3/hr]

dt: throat diameter of the lance nozzle [mm]
?j: density of the gas blown from the lance nozzle [kg/Nm3]

Vp: supply rate of the powdery dephosphorizing agent [kg/min].

US Pat. No. 9,493,865

THICK-WALLED HIGH-STRENGTH HOT ROLLED STEEL SHEET WITH EXCELLENT LOW-TEMPERATURE TOUGHNESS AND METHOD OF PRODUCING SAME

JFE Steel Corporation, (...

1. A method of producing a thick-walled high-strength hot rolled steel sheet comprising:
heating a steel material containing, on a mass percent basis,
0.02%-0.08% C, 0.01%-0.50% Si,
0.5%-1.8% Mn, 0.025% or less P,
0.005% or less S, 0.005%-0.10% Al,
0.01%-0.10% Nb, 0.001%-0.05% Ti,
the balance being Fe, and incidental impurities, C, Ti, and Nb being contained to satisfy expression (1):
(Ti+(Nb/2))/C<4  (1);
performing hot rolling including rough rolling and finish rolling;
performing accelerated cooling at an average cooling rate of 100° C./s or more at a position 1 mm from a surface of the steel
sheet in the thickness direction and at an average cooling rate of 10° C./s or more at a middle position of the steel sheet
in the thickness direction to a cooling stop temperature of BFS or lower at a middle position of the steel sheet in the thickness
direction, wherein BFS is defined by expression (2):

BFS (° C.)=770?300C?70Mn?70Cr?170Mo?40Cu?40Ni?1.5CR  (2);
and
performing coiling at a coiling temperature of BFS0 or lower at the middle position of the steel sheet in the thickness direction,
the BFS0 being defined by expression (3):

BFS0 (° C.)=770?300C?70Mn?70Cr?170Mo?40Cu?40Ni  (3)
where in expressions (1), (2), and (3), C, Ti, Nb, Mn, Cr, Mo, Cu, and Ni each represent a proportion (percent by mass) thereof,
and CR represents a cooling rate (° C./s) at the middle position of the steel sheet in the thickness direction.

US Pat. No. 9,487,849

FERRITIC STAINLESS STEEL

JFE STEEL CORPORATION, T...

1. A ferritic stainless steel comprising, by mass %, C: 0.001 to 0.030%, Si: more than 0.3 to 0.55%, Mn: 0.05 to 0.50%, P:
not more than 0.05%, S: not more than 0.01%, Cr: 19.0 to 28.0%, Ni: 0.01 to less than 0.30%, Mo: 0.2 to 3.0%, Al: more than
0.08 to 1.2%, V: 0.02 to 0.50%, Cu: less than 0.1%, Nb: 0.005 to 0.50%, Ti: 0.05 to 0.50%, and N: 0.001 to 0.030%, the balance
being Fe and inevitable impurities, the ferritic stainless steel satisfying the following equations (1) and (2):
0.6?Si+Al+Ti?1.8  (1)
Nb+1.3Ti+0.9V+0.2Al>0.55  (2)
wherein the chemical symbols in the expressions represent the contents (mass %) of the respective elements; and
wherein the ferritic stainless steel sheet has a pitting potential of 0 mVolt or above.

US Pat. No. 9,475,147

METHOD OF RESISTANCE SPOT WELDING OF HIGH TENSILE STRENGTH STEEL SHEET AND WELDING JOINT MANUFACTURED BY THE METHOD

JFE STEEL CORPORATION, T...

1. A method of resistance spot welding a sheet set of two or more lapped steel sheets by welding the sheet set while clamping
and pressing the sheet set between a pair of welding electrodes, the method sequentially comprising:
a first welding step of applying an weld current Im (kA) and forming a nugget having a nugget diameter d (mm) that satisfies
the following inequality (1);

a cooling step (A), subsequent to the first welding step, of cooling the sheet set while continuing to press the sheet set;
and

a second welding step of performing two-step welding of applying weld currents that satisfy the following inequalities (2)
and (3),

3×?tm?d?6×?tm  (1),

where tm is the thickness (mm) of the thinnest one of the two or more steel sheets,

Im
I22
where I21 and I22 are respectively the weld currents (kA) of a pre-step and a post-step of the two-step welding.

US Pat. No. 9,309,578

BLAST FURNACE OPERATING METHOD AND TUBE BUNDLE-TYPE LANCE

JFE STEEL CORPORATION, T...

1. A method of operating a blast furnace, the method comprising:
blowing at least a solid reducing material into an inside of the furnace from a lance via a tuyere that is located downstream
from the lance,

wherein the lance includes a plurality of blowing tubes bundled side-by-side and housed in a main tube of the lance,
wherein the lance is used when only the solid reducing material or two kinds of the solid reducing material and a combustible
gas or three kinds of the solid reducing material, the combustible gas and a gaseous reducing material are blown in the inside
of the furnace, and

wherein the solid reducing material, the combustible gas and the gaseous reducing material are blown through respective blowing
tubes of the plurality of blowing tubes.

US Pat. No. 9,297,052

HIGH STRENGTH COLD ROLLED STEEL SHEET WITH EXCELLENT DEEP DRAWABILITY AND MATERIAL UNIFORMITY IN COIL AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A high strength cold rolled steel sheet with excellent deep drawability and uniformity of mechanical property in a coil,
the steel sheet having a chemical composition containing, by mass %, C: 0.010% or more and 0.060% or less, Si: more than 0.5%
and 1.5% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.100% or less, S: 0.010% or less, sol.Al: 0.005%
or more and 0.500% or less, N: 0.0100% or less, Nb: 0.010% or more and 0.100% or less, Ti: 0.015% or more and 0.150% or less,
and the balance comprising Fe and inevitable impurities, wherein expressions (1), (2), and (3) below are satisfied, a microstructure
includes, in area fraction, 70% or more of a ferrite phase and 3% or more of a martensite phase, and a tensile strength is
440 MPa or more and an average r value is 1.20 or more:
(Nb/93)/(C/12)<0.20  (1),
0.005?C*?0.025  (2),
(Nb/93+Ti*/48)/(C/12)?0.150  (3),
where, atomic symbol M represents the content (mass %) of the chemical element represented by the symbol M in relational expressions
(1), (2), and (3), where C*=C?(12/93)Nb?(12/48)Ti* and where Ti*=Ti?(48/14)N?(48/32)S, in which Ti?(48/14)N?(48/32)S=0 in
the case where Ti?(48/14)N?(48/32)S?0.

US Pat. No. 9,234,267

HOT-DIP AL—ZN COATED STEEL SHEET

JFE Steel Corporation, T...

1. A hot-dip Al—Zn coated steel sheet that includes an Al—Zn coating layer having an Al content in the range of 20% to 95%
by mass on a surface of the steel sheet, wherein the Al—Zn coating layer contains 0.01% to 10% by mass of Ca, the coating
layer having equal parts in a thickness direction with one part nearer an outer surface of the coating layer and one part
nearer the steel sheet, wherein the Ca is present in a greater amount in the part of the coating layer nearer the outer surface
of the coating layer, and wherein a steel sheet surface layer within 100 ?m from a surface of the base steel sheet directly
under the Al—Zn coating layer contains less than 0.060 g/m2 per surface of an oxide of at least one selected from Fe, Si, Mn, Al, P, B, Nb, Ti, Cr, Mo, Cu, and Ni in total.

US Pat. No. 9,862,014

METHOD FOR ELECTRIC RESISTANCE WELDED STEEL TUBE

JFE Steel Corporation, (...


with Ti and N satisfying (N/14)<(Ti/47.9) as well as Fe and unavoidable impurities as the balance;
forming an electric resistance welded steel tube by bonding lengthwise ends of the open pipe to each other by electric resistance
welding with heat input controlled so that the bond width will fall within the range of 30 to 65 ?m;

heating the electric resistance welded steel tube to a temperature equal to or higher than the Ac3 transformation temperature; and

diameter-reducing rolling the heated electric resistance welded steel tube with rolling reduction expressed by an outer diameter
ratio being (1?25/the bond width before diameter-reducing rolling (?m))×100% or greater such that the bond width will be 25
?m or less.

US Pat. No. 9,646,749

GRAIN-ORIENTED ELECTRICAL STEEL SHEET

JFE STEEL CORPORATION, T...

1. A grain-oriented electrical steel sheet, comprising:
periodic linear strain in a rolling direction of the steel sheet, the linear strain extending in a direction that forms an
angle of 30° or less with a direction orthogonal to the rolling direction of the steel sheet,

iron loss W17/50 being 0.720 W/kg or less,

a magnetic flux density B8 being 1.930 T or more, and a volume fraction ? of a closure domain occurring in the strain portion being 1.00% or more and
3.00% or less of a total magnetic domain volume in the steel sheet,

wherein the volume fraction ? is defined by following formula (A) using a magnetic strain constant ?100 in [100] orientation, 23×10?6, and a difference ?P-P between the maximum and minimum of the magnetic strain measurement with an alternating magnetic field under saturated flux
density


US Pat. No. 9,406,437

GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A grain oriented electrical steel sheet comprising: a forsterite film, tension coating on a surface of the steel sheet;
and grooves for magnetic domain refinement on the surface of the steel sheet,
wherein 1) a thickness of the forsterite film at bottom portions of the grooves is 0.3 ?m or more, 2) groove frequency is
20% or less, the groove frequency being a ratio of the number of grooves, each groove having crystal grains directly beneath
itself, each crystal grain having an orientation deviating from a Goss orientation by 10° or more and a grain size of 5 ?m
or more to the number of all grooves, and 3) total tension exerted on the steel sheet in a rolling direction by the forsterite
film and the tension coating is 10.0 MPa or more, a total tension exerted on the steel sheet in a direction perpendicular
to the rolling direction by the forsterite film and the tension coating is 5.0 MPa or more, and total tensions satisfy:

1.0?A/B?5.0,

where
A is total tension exerted in the rolling direction by the forsterite film and the tension coating, and
B is total tension exerted in a direction perpendicular to the rolling direction by the forsterite film and the tension coating.

US Pat. No. 10,072,318

RAPID HEATING APPARATUS OF CONTINUOUS ANNEALING LINE

JFE STEEL CORPORATION, T...

1. A method for rapid heating in a continuous annealing line provided with a rapid heating apparatus, the method comprising forming an electrical steel sheet that includes a final cold-rolled material having Si: 8.0 mass % or less by:heating the steel sheet at a heating rate of not less than 50° C./s using two or more induction heating devices arranged in series in a front half portion of a heating zone; and
adjusting a temperature of the heating zone in a heating rate adjusting region provided between two of the two or more induction heating devices by holding temperature constant or slow heating the steel sheet at a heating rate in a range of more than 0° C./s and 10° C./s or less,
wherein the heating rate adjusting region has a length in a range of 1 m to 30 m.

US Pat. No. 9,850,441

METHOD FOR BLENDING COALS, AND METHOD FOR PRODUCING COKE

JFE STEEL CORPORATION, T...

1. A method for blending coals for coke production, the method comprising:
a) determining surface tensions for semi-cokes prepared from each of a plurality of coals by heating the coals to a temperature
in a range of 350° C. to 800° C. and then cooling;

b) setting the relative amounts of two or more coals selected from said plurality of coals, based on surface tension data
from the corresponding semi-cokes; and

c) blending the two or more coals.

US Pat. No. 9,833,856

CIRCUMFERENTIAL WELDED JOINT OF LINE PIPE, METHOD OF FORMING CIRCUMFERENTIAL WELDED JOINT OF LINE PIPE, AND LINE PIPE

JFE STEEL CORPORATION, T...

1. A circumferential welded joint of a line pipe, comprising:
steel pipes having a yield strength not smaller than 555 N/mm2, the steel pipes serving as a base material of the circumferential welded joint, being butted against each other at butted
end portions, and including a base material heat affected zone; and

a weld metal located at the butted end portions along a circumferential direction, wherein a weld material and weld conditions
are selected such that:

a joint strength ratio ?match=(TS-w/TS-b)·(YS-w/YS-b) represented by a product of a ratio (TS-w/TS-b) between a tensile strength TS-w of the weld metal
and a tensile strength TS-b of the base material and a ratio (YS-w/YS-b) between a yield strength YS-w of the weld metal and
a yield strength YS-b of the base material, and a critical equivalent plastic strain ?p-cri [%] for ductile crack generation in the base material heat affected zone satisfy Equation (1), and

the yield strength YS-w of the weld metal and the yield strength YS-b of the base material satisfy Equation (2)
?match>4.85?p-cri?0.31  (1)

YS-w/YS-b?1.0  (2).

US Pat. No. 9,708,682

PRODUCTION METHOD FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET

JFE STEEL CORPORATION, T...

1. A production method for a grain-oriented electrical steel sheet, the method comprising: subjecting a steel slab to hot
rolling, without re-heating or after re-heating, to obtain a hot rolled sheet, the steel slab having a composition containing,
by mass % or mass ppm, C: 0.08% or less, Si: 2.0% to 4.5% and Mn: 0.5% or less, S: less than 50 ppm, Se: less than 50 ppm,
O: less than 50 ppm, sol.Al: 80 ppm or less, N in a range satisfying [sol.Al]×(14/27) ppm?N?80 ppm, and the balance being
Fe and incidental impurities; then subjecting the hot rolled sheet to annealing and cold rolling to obtain a cold rolled sheet
of final sheet thickness; then subjecting the cold rolled sheet to primary recrystallization annealing; then applying an annealing
separator thereon; and then subjecting the cold rolled sheet to secondary recrystallization annealing,
wherein after cold rolling and before the start of secondary recrystallization annealing, the cold rolled sheet is subjected
to nitriding treatment to obtain a nitrogen content of 50 mass ppm or more and 1000 mass ppm or less,

the annealing separator contains 50 mass % or more of MgO and a total content of 0.2 mass % to 15 mass % of a sulfide and/or
sulfate, and

a staying time in the temperature range of 300° C. to 800° C. in the heating stage of the secondary recrystallization annealing
of 5 hours or more is secured.

US Pat. No. 9,631,250

HIGH-STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A high-strength cold-rolled steel sheet having a chemical composition containing by mass %:
C: 0.12% to 0.22%;
Si: 0.8% to 1.8%;
Mn: 2.2% to 3.2%;
P: 0.020% or less;
S: 0.0040% or less;
Al: 0.005% to 0.08%;
N: 0.008% or less;
Ti: 0.001% to 0.040%;
B: 0.0001% to 0.0020%; and
the remainder being Fe and incidental impurities,
wherein the steel sheet has a microstructure including ferrite phase: 40% to 60% by volume fraction, bainite phase: 10% to
30% by volume fraction, tempered martensite phase: 20% to 40% by volume fraction, and retained austenite phase: 5% to 20%
by volume fraction, and satisfying a condition that a ratio of tempered martensite phase having major axis length ?5 ?m to
a total volume fraction of the tempered martensite phase is 80% to 100%.

US Pat. No. 9,630,238

METHOD AND APPARATUS THAT FORMS A CLOSED CROSS-SECTIONAL STRUCTURE

JFE Steel Corporation, (...

1. A method of forming a plate-shaped workpiece into a closed cross-sectional structure, the structure including a bottom
portion formed in a central part thereof in a width direction and extends in a longitudinal direction, left and right side
wall portions located on both sides of the bottom portion in the width direction and rise in a height direction, and a pair
of flange portions formed at ends of the left and right side wall portions in the height direction, comprising:
a first step of press-forming the plate-shaped workpiece into a shape having first bend lines that extend in a longitudinal
direction and portions that are separated by the first bend lines to correspond to the bottom portion, the left and right
side wall portions, and the pair of flange portions such that the portion corresponding to the bottom portion includes a first
bottom portion and a second bottom portion that incline in the height direction toward a second bend line that extends in
the longitudinal direction along a boundary between the first and second bottom portions;

a second step of bending the workpiece, which has been formed in the first step so that the portions corresponding to the
left and right side wall portions face each other by clamping the portion corresponding to the first and second bottom portions
between a first punch and a pad having a support surface in a plate-thickness direction to bend the plate-shaped workpiece
along the second bend line to cause the first and second bottom portions to reverse the direction of the incline of the first
and second bottom portions to incline in a direction opposite to the height direction toward the second bend line; and

a third step of:
pushing a pair of pressure cams having respective pressing surfaces inwardly, while the portion of the workpiece corresponding
to the bottom portion formed in the second step is placed on the support surface of the pad, to move the portions corresponding
to the left and right side wall portions closer to each other so that the portions corresponding to the pair of flange portions
are butted against each other and to define a die cavity having the same shape as a final shape of the closed cross-sectional
structure with the support surface of the pad and the pressing surfaces of the pair of pressure cams; and

pressing the portions corresponding to the bottom portion and the left and right side wall portions against the support surface
and the pressing surfaces that form the die cavity by further bending the workpiece at the first bend lines to depress the
portions corresponding to the pair of flange portions toward the cavity using a depressing portion of a second punch disposed
above the pair of flange portions.

US Pat. No. 9,340,859

METHOD FOR MANUFACTURING HIGH STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT STABILITY OF MECHANICAL PROPERTIES, FORMABILITY, AND COATING APPEARANCE

JFE Steel Corporation, (...

1. A method of manufacturing a high strength galvanized steel sheet having excellent stability of mechanical properties, formability,
and coating appearance, comprising:
applying a first heating step to a steel sheet containing C: 0.04% or more and 0.13% or less, Si: 0.7% or more and 2.3% or
less, Mn: 0.8% or more and 2.0% or less, P: 0.1% or less, S: 0.01% or less, Al: 0.1% or less, N: 0.008% or less, and the remainder
composed of Fe and incidental impurities, on a percent by mass basis, in which, in a former part, heating is performed in
an atmosphere containing O2: 0.1 to 20 percent by volume and H2O: 1 to 50 percent by volume at a temperature of 400° C. to 750° C. and, in a latter part, heating is performed in an atmosphere
containing O2: 0.01 to less than 0.1 percent by volume and H2O: 1 to 20 percent by volume at a temperature of 600° C. to 850° C.;

applying a second heating step to the resultant steel sheet, in which holding is performed in an atmosphere containing H2: 1 to 50 percent by volume and having a dew point of 0° C. or lower at a temperature of 750° C. to 900° C. for 15 to 600
s, cooling to a temperature of 450° C. to 550° C. is performed, and holding is performed at a temperature of 450° C. to 550°
C. for 10 to 200 s; and

applying a galvanization treatment,
wherein the galvanized steel sheet includes 75% or more of ferrite phase, 1.0% or more of bainitic ferrite phase, and 1.0%
or more and 10.0% or less of pearlite phase, on an area ratio basis, the area ratio of martensite phase is 1.0% or more and
less than 5.0%, and the area ratio of the martensite phase/(area ratio of bainitic ferrite phase+area ratio of pearlite phase)<0.6
is satisfied.

US Pat. No. 9,200,165

SURFACE TREATMENT LIQUID FOR ZINC OR ZINC ALLOY COATED STEEL SHEET, ZINC OR ZINC ALLOY-COATED STEEL SHEET, AND METHOD FOR MANUFACTURING THE SAME

JFE STEEL CORPORATION, T...

1. A surface treatment liquid for a zinc or zinc alloy-coated steel sheet comprising:
(A) a resin compound having a bisphenol skeleton represented by general formula (I) below;
(B) a cationic urethane resin emulsion having at least one type of cationic functional group selected from the group consisting
of primary to tertiary amino groups and a quaternary ammonium base;

(C) at least one type of silane coupling agent having at least one type of reactive functional group selected from the group
consisting of active hydrogen-containing amino group, epoxy group, mercapto group, and methacryloxy group;

(D) an organic titanium chelate compound;
(E) a quadrivalent vanadyl compound;
(F) a molybdate compound;
(G) a fluorine compound; and
(H) water,
pH of said surface treatment liquid is in the range of 4 to 5, and
wherein the components satisfy the following conditions (1) to (6):
(1) a solid mass ratio [(Bs)/{(As)+(Bs)+(Cs)}], which is a ratio of solid mass content (Bs) of said cationic urethane resin emulsion (B) with respect to the total solid mass content {(As)+(Bs)+(Cs)} of said resin compound (A), said cationic urethane resin emulsion (B), and said silane coupling agent (C), is in the range
of 0.10 to 0.30;

(2) a solid mass ratio [(Cs)/{(As)+(Bs)+(Cs)}], which is a ratio of solid mass content (Cs) of said silane coupling agent (C) with respect to the total solid mass content {(As)+(Bs)+(Cs)} of said resin compound (A), said cationic urethane resin emulsion (B), and said silane coupling agent (C), is in the range
of 0.60 to 0.85;

(3) a mass ratio {(Cs)/(DTi)}, which is a ratio of solid mass content (Cs) of said silane coupling agent (C) with respect to mass content (DTi) in terms of titanium standard of said organic titanium chelate compound (D), is in the range of 50 to 70;

(4) a mass ratio {(Ev)/(DTi)}, which is a ratio of mass content (Ev) in terms of vanadium standard of said quadrivalent vanadyl compound (E) with respect to mass content (DTi) in terms of titanium standard of said organic titanium chelate compound (D), is in the range of 0.30 to 0.50;

(5) a mass ratio [(FMo)/{(As)+(Bs)+(Cs)}], which is a ratio of mass content (FMo) in terms of molybdenum standard of said molybdate compound (F) with respect to the total solid mass content {(As)+(Bs)+(Cs)} of said resin compound (A), said cationic urethane resin emulsion (B), and said silane coupling agent (C), is in the range
of 0.003 to 0.03; and

(6) a mass ratio [(GF)/{(As)+(Bs)+(Cs)}], which is a ratio of mass content (GF) in terms of fluorine standard of said fluorine compound (G) with respect to the total solid mass content {(As)+(Bs)+(Cs)} of said resin compound (A), said cationic urethane resin emulsion (B), and said silane coupling agent (C), is in the range
of 0.01 to 0.1;


wherein in general formula (I), Y1 and Y2 respectively bonded to benzene rings independently represent a hydrogen atom or a Z group represented by general formula (II)
or (III) below; the average number of substituent Z groups per benzene ring is in the range of 0.2 to 1.0; and “n” is an integer
in the range of 2 to 50;


and wherein in general formula (II) or (III), R1, R2, R3, R4, and R5 independently represent a hydrogen atom, a C1-C10 alkyl group, or a C1-C10 hydroxyalkyl group; and A? represents a hydroxide ion or an acid ion.

US Pat. No. 9,089,919

WELDED STEEL PIPE FOR LINEPIPE WITH HIGH COMPRESSIVE STRENGTH AND MANUFACTURING METHOD THEREOF

JFE Steel Corporation, C...

1. A welded steel pipe for a linepipe having a composition which contains by mass % 0.03 to 0.10% C, 0.15% or less Si, 1.50
to 2.00% Mn, 0.015% or less P, 0.003% or less S, 0.080% or less Al, 0.005 to 0.035% Nb, 0.005 to 0.020% TI, and Fe and unavoidable impurities as a balance, wherein
C(%)—0.065Nb(%) is 0.025 or more, and
a Ceq value is 0.36 or more, and
the steel pipe has metal microstructure where an area fraction of bainite is 60% or more, an area fraction of rolled ferrite
is 5% or less, an area fraction of M-A constituent (MA) is 0.6 to 3%, an average grain size of MA is 2?m or less, and an aspect
ratio of MA is 5 or less,

wherein the Ceq value is expressed by the formula:
Ceq=C(%)+Mn(%)/6+{Cr(%)+Mo(%)+V(%)}/5+{(Cu(%)+NI(%)}/15.
US Pat. No. 9,068,238

HIGH TENSILE STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

JFE STEEL CORPORATION, T...

1. A high tensile strength hot rolled steel sheet having tensile strength of at least 980 MPa and excellent formability, comprising:
a composition including by mass %,
C: 0.07% to 0.13% (inclusive of 0.07% and 0.13%),
Si: 0.3% or less,
Mn: 0.5% to 2.0% (inclusive of 0.5% and 2.0%),
P: 0.025% or less,
S: 0.005% or less,
N: 0.0060% or less,
Al: 0.06% or less,
Ti: 0.08% to 0.14% (inclusive of 0.08% and 0. 14%),
V: 0.15% to 0.30% (inclusive of 0.15% and 0. 30%),
solute V: 0.04% to 0.1% (inclusive of 0.04% and 0.1%),
solute Ti: 0.05% or less, and
remainder consisting of Fe and incidental impurities;
the total content, by mass %, of the solute V and the solute Ti being at least 0.07%;
microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average
particle diameter of less than 10 nm, as well as volume ratio with respect to the entire microstructure of at least 0.007;
and

matrix as ferrite phase having area ratio with respect to the entire microstructure of at least 97%, wherein contents of C,
Ti, V, S and N satisfy formula (1) and formula (2):

Ti?0.08+(N/14×48+S/32×48)  (1)
0.8?(Ti/48+V/51)/(C/12)?1.2   (2)where C, Ti, V, S, and N represent contents (mass %) of corresponding elements, respectively.
US Pat. No. 10,041,160

STEEL FOR SPRING, AND METHOD FOR PRODUCING SPRING

JFE STEEL CORPORATION, T...

1. Steel for springs, the steel comprising a chemical composition containingC: 0.45 mass % or more and less than 0.65 mass %,
Si: 0.15 mass % or more and 0.70 mass % or less,
Mn: 0.10 mass % or more and 1.00 mass % or less,
Cr: 0.20 mass % or more and 1.50 mass % or less,
P: 0.025 mass % or less,
S: 0.025 mass % or less,
O: 0.0015 mass % or less,
Sb: 0.010 mass % or more and less than 0.030 mass %,
Sn: 0.010 mass % or more and 0.030 mass % or less, and
the balance being Fe and incidental impurities, and an A value calculated by Formula (1) being 0.65 or more and 3.50 or less, a B value calculated by Formula (2) being 3.10 or more and 34.00 or less, and a C value calculated by Formula (3) being 0.020 mass % or more and 0.050 mass % or less:
A=[C]/([Si]+[Sb]+[Sn])  (1),
B=[Si]/([Sn]+[Sb])  (2),
C=[Sb]+[Sn]  (3),
where brackets represent content in mass % of an element enclosed in the brackets.

US Pat. No. 9,857,350

COAL-TO-COAL ADHESIVENESS EVALUATION METHOD

JFE STEEL CORPORATION, T...

1. A coal-to-coal adhesiveness evaluation method for evaluating an adhesiveness between first and second kinds of coals that
are to be carbonized in contact with each other, the method comprising:
evaluating the adhesiveness based on a value of interfacial tension between first and second kinds of semicokes obtained by
heat treating the first and second kinds of coals in a temperature range of between 350° C. and 800° C.,

wherein the value of interfacial tension is calculated according to Equation (3) below from measured values of surface tension
of the first and second kinds of semicokes:
[Math. 3]
?AB=?A+?B?2??{square root over (?A?B)}  (3)

 wherein
?A: the surface tension of the first kind of semicokes,

?B: the surface tension of the second kind of semicokes,

?AB: the interfacial tension between the first and second kinds of semicokes, and

?: an interaction parameter.

US Pat. No. 9,841,124

HIGH-STRENGTH THICK-WALLED ELECTRIC RESISTANCE WELDED STEEL PIPE HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS AND METHOD OF MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A high-strength thick-walled electric resistance welded steel pipe having excellent low-temperature toughness and excellent
HIC resistance comprising:
a base metal composition consisting of, on a mass percent basis,
C: 0.025% to 0.084%, Si: 0.10% to 0.30%,
Mn: 0.70% to 1.80%, P: 0.001% to 0.018%,
S: 0.0001% to 0.0029%, Al: 0.01% to 0.10%,
Nb: 0.001% to 0.065%, V: 0.001% to 0.065%,
Ti: 0.001% to 0.033%, Ca: 0.0001% to 0.0035%,
N: 0.0050% or less, O: 0.0030% or less, and
optionally, one or more selected from the group consisting of B: 0.0030% or less, Cu: 0.001% to 0.350%, Ni: 0.001% to 0.350%,
Mo: 0.001% to 0.350%, and Cr: 0.001% to 0.700% and the remainder being Fe and incidental impurities,

wherein Pcm defined by formula (1) is 0.20 or less,
Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B  (1)
wherein C, Si, Mn, Cu, Ni, Cr, Mo, V, and B denote amounts (mass %) of corresponding elements,a microstructure which includes 90% by area or more of quasi-polygonal ferrite having a grain size of 10 ?m or less in each
of a base steel portion and an electric resistance welded portion of the steel pipe,a yield strength YS of 400 MPa or more,andan absorbed energy vE?50 of 150 J or more at ?50° C. in a Charpy impact test,wherein the electric resistance welded steel pipe is formed by rounding a steel strip having the base metal composition to
form a butt joined seam by electronic resistance welding.
US Pat. No. 9,752,216

HIGH-STRENGTH HOT ROLLED STEEL SHEET WITH EXCELLENT BENDABILITY AND LOW-TEMPERATURE TOUGHNESS, AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A high-strength hot rolled steel sheet with excellent bendability and low-temperature toughness comprising a chemical composition
including, in mass %,
C: 0.08 to 0.25%, Si: 0.01 to 1.0%,
Mn: 0.8 to 2.1%, P: not more than 0.025%,
S: not more than 0.005% and Al: 0.005 to 0.10%,
the balance comprising Fe and inevitable impurities, and a microstructure having a bainite phase and/or a tempered martensite
phase as a main phase, the average grain diameter of prior austenite grains being not more than 20 ?m as measured with respect
to a cross section parallel to a rolling direction and not more than 15 ?m as measured with respect to a cross section perpendicular
to the rolling direction,

wherein the microstructure has an X-ray plane intensity {223}<252> of not more than 5.0.

US Pat. No. 9,666,350

ULTRATHIN ELECTROMAGNETIC STEEL SHEET

JFE Steel Corporation, (...

1. An ultra-thin electrical steel sheet having a component composition including, by mass %:
C: 0.007% or less,
Si: 4% to 10%, and
Mn: 0.005% to 1.0%,
the balance being Fe and incidental impurities,wherein the electrical steel sheet has a sheet thickness of 0.01 mm or more to 0.10 mm or less, and a profile roughness Pa,
defined as an arithmetic mean deviation of an assessed profile according to JIS B 0601 (2001), of 1.0 ?m or less.

US Pat. No. 9,598,744

METHOD FOR PRODUCING HOT-PRESSED MEMBER

JFE Steel Corporation, T...

1. A method for producing a hot-pressed member comprising heating a coated steel sheet, which includes, on a surface thereof,
a Zn—Ni alloy coating layer containing 10% by mass or more and less than 13% by mass of Ni at a coating weight of over 50
g/m2 per side of the steel sheet, in a temperature region of an Ac3 transformation point to 1200° C. at an average heating rate of 12° C./second or more; and then hot-pressing the steel sheet.
US Pat. No. 9,598,755

HIGH STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT DEEP DRAWABILITY AND STRETCH FLANGEABILITY AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A high-strength galvanized steel sheet comprising: on a mass percent basis, C: 0.010% or more and 0.06% or less, Si: more
than 0.5% and 1.5% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.1% or less, S: 0.01% or less, sol.Al:
0.005% or more and 0.5% or less, N: 0.01% or less, Nb: 0.010% or more and 0.090% or less, and Ti: 0.015% or more and 0.15%
or less, the Nb and C contents % by mass of the steel satisfying the relation of (Nb/93)/(C/12)<0.20, C* given by the following
formula (1) satisfying 0.005?C*?0.025, and the remainder being Fe and incidental impurities without addition of V, wherein
ferrite constitutes 70% by area ratio or more, martensite constitutes 3% by area ratio or more, the average r-value Lankford
value is 1.2 or more, and the hole expansion ratio ? is 80% or more:
C*=C?(12/93)Nb?(12/48){Ti?(48/14)N}  (1)
wherein C, Nb, Ti, and N denote the C, Nb, Ti, and N contents % by mass of the steel, respectively, provided that if Ti?(48/14)N?0,
then Ti?(48/14)N=0.

US Pat. No. 9,534,269

HIGH STRENGTH COLD ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A method of manufacturing a cold rolled steel sheet comprising:
hot-rolling and cold-rolling a steel slab having a composition comprising, in percent by mass, more than 0.015% to less than
0.100% of carbon, less than 0.40% of silicon, 1.0% to 1.9% of manganese, more than 0.015% to 0.05% of phosphorus, 0.03% or
less of sulfur, 0.01% to 0.3% of soluble aluminum, 0.005% or less of nitrogen, less than 0.30% of chromium, 0.0050% or less
of boron, less than 0.15% of molybdenum, 0.4% or less of vanadium, 0.02% or less of titanium, and 0.18% or less of copper,
and satisfying formula (1):

0.6[% Si]+[% Cr]+2[% Mo]<0.35  (1)wherein [% A] is content (% by mass) of alloying element A, the balance being iron and incidental impurities to form a steel
sheet;
annealing the steel sheet at an annealing temperature of 750° C. to 830° C.;
subjecting the steel sheet to first cooling at an average cooling rate of 3° C./sec to 40° C./sec in a temperature range from
the annealing temperature to 480° C.;

subjecting the steel sheet to second cooling at an average cooling rate of 8° C./sec to 80° C./sec in a temperature range
from 480° C. to Tc (° C.) given by formula (6):

Tc=435?40×[% Mn]?30×[% Cr]?30×[% V]  (6)wherein [% A]is the content (% by mass) of alloying element A; and
subjecting the steel sheet to third cooling at an average cooling rate of 0.3° C./sec to less than 1° C./sec in a temperature
range from Tc (° C.) to 200° C.,

wherein at least one of the first, second and third cooling rates is different from the other cooling rates and the third
cooling rate is lower than the second cooling rate, and the second cooling rate is greater than the first cooling rate.

US Pat. No. 9,492,888

WELDING POSITION DETECTING APPARATUS AND WELDING POSITION DETECTING METHOD FOR LASER BEAM WELDING

JFE STEEL CORPORATION, T...

1. A welding position detecting apparatus for laser beam welding, the welding position detecting apparatus comprising:
an imaging device that captures, at a predetermined time interval, images of an irradiated portion of a welding material irradiated
with a welding laser beam, and a surrounding area thereof, of a welding material;

an image processing device that identifies a position of the irradiated portion irradiated with the welding laser beam by
performing image processing calculating, from two or more images acquired by the imaging device, a direction and an amount
of parallel movement of points in the images; and

a display device that displays the position of the irradiated portion irradiated with the welding laser beam, the position
being identified by the image processing device.

US Pat. No. 9,321,084

DESCALING NOZZLE FOR REMOVING SCALE FROM STEEL SHEET, DESCALING APPARATUS FOR REMOVING SCALE FROM STEEL SHEET, AND DESCALING METHOD FOR REMOVING SCALE FROM STEEL SHEET

JFE STEEL CORPORATION, T...

1. A descaling nozzle for removing scale from a steel sheet by spraying water onto a surface of the steel sheet, the descaling
nozzle comprising:
a spray section which is at an end of the descaling nozzle and which includes:
a taper portion that is continuous with a large diameter portion forming a cylindrical channel;
a first orifice that is formed on an outlet side of the taper portion; a resonant chamber that is continuous with an outlet
side of the first orifice and that has a dimension in a radial direction that is greater than an outer diameter of the first
orifice; and a second orifice formed on an outlet side of the resonant chamber, wherein the resonant chamber has a rectangular
cross-sectional shape and has non-curved wall surfaces, wherein all of the non-curved wall surfaces of the resonant chamber
are flat.

US Pat. No. 9,074,275

GALVANIZED STEEL SHEET

JFE STEEL CORPORATION, T...

1. A galvanized steel sheet comprising:
a basal steel sheet containing elements C: 0.01 to 0.15%, Si: 0.001 to 2.0%, Mn: 0.1 to 3.0%, Al: 0.001 to 1.0%, P: 0.005
to 0.060%, and S?0.01%, all in percent by mass, and Fe and unavoidable impurities as the balance;

a zinc plating layer formed on both sides of the basal steel sheet with an amount of plating per side in a range of 20 to
120 g/m2;

a steel sheet superficial portion, located in direct contact with each zinc plating layer and extending from each surface
of the basal steel sheet to a depth of 100 ?m, with a total amount of the oxides per side in a range of 0.01 to 0.5 g/m2, the oxides being at least one oxide selected from the group consisting of Fe, Si, Mn, Al, and P oxides; and

a Si and Mn containing crystalline complex oxide region extending from each surface of the basal steel sheet to a depth of
10 ?m, which is also located in direct contact with the zinc plating layer, the crystalline complex oxide comprising Fe crystal
grains within which Si and Mn atoms are distributed throughout a region from a grain boundary to a depth of 1 ?m inside the
Fe crystal grain,

wherein Si and Mn atoms are prevented from diffusing inside basal iron grains and accordingly are prevented from concentrating
at surfaces of the basal steel sheet.

US Pat. No. 9,863,023

FERRITIC STAINLESS STEEL AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A ferritic stainless steel having a composition containing, by mass %, C: 0.001% to 0.030%, Si: 0.03% to 0.30%, P: 0.05%
or less, S: 0.01% or less, Cr: more than 22.0% to 28.0%, Mo: 0.2% to 3.0%, Al: 0.01% to 0.15%, Ti: more than 0.30% to 0.80%,
V: 0.001% to 0.080%, and N; 0.001% to 0.050%; Mn: 0.05% to 0.30% and Ni: 0.01% to 5.00%, or Mn: 0.05% to 2.00% and Ni: 0.01%
to 0.30%; Nb: 0.001% to 0.033%; and the balance being Fe and inevitable impurities, and
having a surface where TiN having a grain diameter of 1 ?m or more is distributed at a density of 30 particles/mm2 or more.

US Pat. No. 9,862,017

METHOD AND APPARATUS THAT FORMS A CLOSED CROSS-SECTIONAL STRUCTURE

JFE Steel Corporation, (...

1. An apparatus that forms a closed cross-sectional structure by bending a plate-shaped workpiece at positions of a plurality
of bend lines extending in a longitudinal direction, the structure including a bottom portion formed in a central part of
the workpiece in a width direction and left and right side wall portions located on both sides of the bottom portion in the
width direction, comprising:
a pressing die including an upper die and a lower die that press-forms the plate-shaped workpiece into a shape including portions
corresponding to the bottom portion and the left and right side wall portions such that the plurality of bend lines are formed
at boundaries therebetween and to provide bend-facilitating lines at the plurality of bend lines;

a bending die that bends the workpiece, which has been formed using the pressing die, in a direction that the portions corresponding
to the left and right side wall portions approach each other by pressing a punch into a space between a pair of dies while
clamping the portion corresponding to the bottom portion between the punch and a pad in a plate thickness direction; and

a final-closed-cross-section bending die including a plug, a pair of pressure cams and support pad, the plug having an outer
peripheral shape the same as a final shape of the closed cross-sectional structure and disposed on the portion of the workpiece
corresponding to the bottom portion, which has been formed using the bending die, the support pad supporting the portion of
the workpiece corresponding to the bottom portion, the pair of pressure cams being disposed outside of the plug in the width
direction, the final-closed-cross-section die bending the portions corresponding to the bottom portion and the left and right
side wall portions along the bend-facilitating lines by pressing the portions corresponding to the bottom portion and the
left and right side wall portions against an outer periphery of the plug using the support pad and the pair of pressure cams,

wherein each of the bend-facilitating lines is a portion of the workpiece where a groove is formed in one surface thereof
and a protrusion having a substantially U-shape corresponding to the groove is formed on the other surface thereof, wherein
a depth of the groove is greater than or equal to 0.05 times and less than or equal to 0.3 times a plate thickness of the
workpiece and wherein a width of the groove is greater than or equal to 0.2 mm and less than or equal to 3.0 mm.

US Pat. No. 9,855,590

STEEL-SHEET SNAKING PREVENTING DEVICE AND STEEL-SHEET SNAKING PREVENTING METHOD FOR VERTICAL LOOPER

JFE Steel Corporation, (...

1. A steel-sheet snaking preventing device for a vertical looper, the device comprising:
a jack mechanism provided at each of at least two corners of a looper carriage and coupled via a metal fitting to a chain
or a wire rope that pulls the looper carriage;

a tilt meter configured to detect an amount of tilt of the looper carriage;
a level meter configured to detect a height of the looper carriage;
a signal detection receiver configured to receive detection signals from the tilt meter and the level meter; and
a controller configured to determine the amount of tilt of the looper carriage at which the amount of snaking of a steel sheet
becomes zero based on the detection signal from the level meter, send the determined amount of tilt of the looper carriage
as a command to the jack mechanism, and control the amount of tilt of the looper carriage by the jack mechanism.

US Pat. No. 9,708,680

HOT ROLLED STEEL SHEET FOR SQUARE COLUMN FOR BUILDING STRUCTURAL MEMBERS

JFE Steel Corporation, (...

1. A hot rolled steel sheet for a square column for building structural members, the hot rolled steel sheet having a composition
of, in terms of % by mass,
C: 0.07 to 0.17%, Mn: 0.3 to 1.5%,
P: 0.03% or less, S: 0.015% or less,
Al: 0.01 to 0.06%, N: 0.006% or less,
and the balance being Fe and unavoidable impurities, and having a microstructure that includes a primary phase constituted
of ferrite and a second phase constituted of pearlite or pearlite and bainite, wherein a second phase frequency defined by
equation (1) below is 0.20 to 0.42 and a mean crystal grain diameter of the primary phase and the second phase together is
7 to 15 ?m

Second phase frequency=(Number of second phase grains intersecting line segments of a length)/(Number of primary phase grains
and second phase grains intersecting line segments of the same length)  (1).

US Pat. No. 9,657,382

HIGH-STRENGTH HOT ROLLED STEEL SHEET

JFE Steel Corporation, (...

1. A high-strength hot rolled steel sheet with a yield strength of not less than 530 MPa, the steel sheet having a chemical
composition including, by mass %:
C: more than 0.010% and not more than 0.06%,
Si: not more than 0.3%,
Mn: not more than 0.48%,
P: not more than 0.03%,
S: not more than 0.02%,
Al: not more than 0.1%,
N: not more than 0.01% and Ti: 0.05 to 0.10%,
the balance comprising Fe and inevitable impurities, the steel sheet comprising a metal microstructure including a ferrite
phase with an area ratio of not less than 95%, the ferrite crystal grains having an average grain size of not less than 1
?m, the ferrite crystal grains containing TiC precipitate particles dispersed in the crystal grains, the TiC precipitate particles
having an average particle size of not more than 7 nm, and the steel sheet having a ?YS of 20 MPa or less.

US Pat. No. 9,605,331

BATCH ANNEALING FURNACE FOR COILS

JFE STEEL CORPORATION, T...

1. A batch annealing furnace for coils configured to anneal a coil in which a steel sheet is wound, the batch annealing furnace
comprising:
a coil support base on which an end face of the coil is mounted and that supports the coil with an axis of the coil being
upright;

an inner cover that covers an entire body of the coil mounted on the coil support base; and
a cooling pipe that extends downward from an upper part of the inner cover to a cavity of an inner peripheral part of the
coil mounted on the coil support base and cools the coil from an inner surface side by passing a coolant through inside of
the cooling pipe,

wherein the cooling pipe comprises a double pipe comprising a cylindrical inner pipe and a cylindrical outer pipe that surrounds
the inner pipe, the inner pipe serves as an introduction pipeline that introduces the coolant from the upper part of the inner
cover toward the coil support base, and an area between the outer pipe and the inner pipe serves as a return pipeline that
returns the coolant from the coil support base toward the upper part of the inner cover, and

wherein at a location where a direction of flow of the coolant passing through the introduction pipeline and the return pipeline
changes, a bottom plate having a semispherical shape convex downward whose diameter is half the radius of the outer pipe or
more reverses the direction.

US Pat. No. 9,594,191

SOLAR REFLECTOR PLATE

JFE Steel Corporation, (...

1. A solar reflector plate comprising:
a substrate;
a reflective layer provided onto the substrate; and
a protective layer provided onto the reflective layer,
wherein the solar reflector plate has a laminated structure in which the substrate, the reflective layer and the protective
layer are stacked in this order and are co-extensive with each other, and

the protective layer contains silicon in an amount of 10% by mass to 60% by mass in terms of SiO2 and an organic substance, and has 1.5 to 3.2 oxygen atoms on average that form a chemical bond with silicon.

US Pat. No. 9,514,868

GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A grain oriented electrical steel sheet having a forsterite coating and tension coating on a surface thereof and having
plastic strain extending in a direction inclined by 45° to 90° with respect to the rolling direction, wherein:
the forsterite coating is formed by coating a surface of the steel sheet with 10.0 g/m2 to 20.0 g/m2 of annealing separator;

total tension in a rolling direction imparted to the steel sheet by the forsterite coating and the tension coating is equal
to or higher than 15 MPa,

total tension in a direction orthogonal to the rolling direction imparted to the steel sheet by the forsterite coating and
the tension coating is equal to or higher than 5.0 MPa; and

the total tension in the rolling direction and the total tension in the direction orthogonal to the rolling direction satisfy
1.0?A/B?5.0
A: the total tension in rolling direction imparted to the steel sheet by forsterite coating and tension coating, andB: the total tension in a direction orthogonal to the rolling direction imparted to the steel sheet by forsterite coating
and tension coating.

US Pat. No. 10,073,928

METHOD AND DEVICE FOR ANALYSIS OF SHAPE OPTIMIZATION

JFE Steel Corporation, (...

1. A method for analysis of shape optimization comprising optimizing a part of a structural body model including a movable portion, by combining a multi-body dynamics analysis and an optimization analysis and using two-dimensional elements or three-dimensional elements, the optimizing includes:a design space setting step of setting, as a design space, a portion to be optimized in the movable portion;
an optimization block model generating step of generating, in the set design space, an optimization block model formed of three-dimensional elements and is to be subjected to analysis processing of optimization;
a connection processing step of connecting the generated optimization block model with the structural body model including the movable portion;
a material property setting step of setting a material property for the optimization block model;
an optimization analysis condition setting step of setting an optimization analysis condition to determine an optimum shape of the optimization block model;
a multi-body dynamics analysis condition setting step of setting a multi-body dynamics analysis condition including a centrifugal force, a reaction force and an inertial force to perform multi-body dynamics analysis on the structural body model including the movable portion with which the optimization block model has been connected;
an optimum shape analyzing step of executing, based on the set multi-body dynamics analysis condition, the multi-body dynamics analysis on the structural body model including the movable portion incorporating the optimization block model; executing, based on the set optimization analysis condition, the optimization analysis; and finding the optimum shape of the optimization block model, and
utilizing the analysis of shape optimization for configuring optimization of the movable portion of the structural body configured of a thin sheet; and
displaying the structural body model including the moveable portion based on the optimum shape analyzing step;
wherein
the optimization block model is generated by:
setting nodes in a portion connected with the two-dimensional elements or three-dimensional elements forming the structural body model; and
stacking the three-dimensional elements along a plane including the nodes set in the connected portion.

US Pat. No. 9,995,669

ROUND BAR TENSILE TEST SPECIMEN FOR SULFIDE STRESS CORROSION CRACKING TEST OF A STEEL, TEST METHOD FOR SULFIDE STRESS CORROSION CRACKING OF STEEL, AND SEAMLESS STEEL PIPE HAVING EXCELLENT RESISTANCE TO SULFIDE STRESS CORROSION CRACKING

JFE STEEL CORPORATION, T...

1. A round bar tensile test specimen for a sulfide stress corrosion cracking test of a steel, the specimen comprising:a parallel section;
a grip section; and
a shoulder section disposed between the parallel section and the grip section, a sectional shape of the shoulder section being formed by a single continuous curve having two or more radii of curvature,
wherein a radius of curvature R1 (mm) of a portion of the curve adjacent to the parallel section is 15 mm or more,
the radius of curvature R1 (mm) satisfies formula (1) below in terms of load stress ? (MPa) of the sulfide stress corrosion cracking test:
(0.22??119)?R1?100  (1)
a length X1 (mm) of the portion of the curve having the radius of curvature R1 in a longitudinal direction of the test specimen satisfies formula (2) below:
X1??{(r/8)×(R1?r2/4)}  (2)
r: radius (mm) of the tensile test specimen in the parallel section, and
other radii of curvature of the curve are smaller than the radius of curvature R1.

US Pat. No. 9,920,390

METHOD FOR PRELIMINARY TREATMENT OF MOLTEN IRON

JFE STEEL CORPORATION, T...

1. A method for preliminary treatment of molten iron by conducting desiliconization and dephosphorization of molten iron with
a converter container, the method comprising:
charging untreated molten iron tapped from a blast furnace into the converter container to conduct a first desiliconization;
then retaining the molten iron and a part of a slag after the first desiliconization in the converter container to conduct
intermediate slag removal;

subsequently adding a lime-based flux solvent to the molten iron and slag retained in the converter container after the first
desiliconization while blowing oxygen to conduct a first dephosphorization of the molten iron, not less than 30 mass % of
a slag having a slag basicity of not less than 1.2 after the first dephosphorization is retained in the converter container,

then charging more untreated molten iron into the converter container containing the slag after the first dephosphorization
to conduct a second desiliconization, and adjusting a basicity of the slag during the second desiliconization such that the
basicity is in the range of 0.8 to 1.5, silicon concentration of molten iron at the end of the second desiliconization is
not more than 0.2 mass %, a basicity of the slag after the second desiliconization is in the range of 0.5 to 1.5 and a temperature
of the molten iron is in the range of 1240° C. to 1400° C.;

thereafter conducting a second intermediate slag removal of discharging not less than 40 mass % of the slag after the second
desiliconization from the converter container; and

subsequently conducting a second dephosphorization in the converter container, wherein
the basicity of the slag during the second desiliconization is obtained by dividing a numerical value obtained by adding an
amount of CaO contained in the slag after the first dephosphorization with a CaO amount generated, with a numerical value
obtained by adding a SiO2 amount in a residual dephosphorized slag with a SiO2 amount generated,

the CaO amount generated is calculated by multiplying (i) a CaO content in an auxiliary material, (ii) a retention time of
the auxiliary material in a furnace, and (iii) a dissolution rate of the auxiliary material in the furnace, and

the SiO2 amount generated is calculated by multiplying (i) an oxygen feeding rate in blowing, (ii) the molecular weight of SiO2 divided by the atomic weight of Si and further divided by a theoretical Si amount burnt by oxygen of 1 Nm3, (iii) an oxygen efficiency for desiliconization in blowing, and (iv) a total amount of molten iron and scrap.

US Pat. No. 9,873,164

ELECTRIC RESISTANCE WELDED STEEL PIPE OR STEEL TUBE HAVING EXCELLENT HIC RESISTANCE AND LOW-TEMPERATURE TOUGHNESS IN ELECTRIC RESISTANCE WELDED PART, AND METHOD FOR MANUFACTURING THE SAME

JFE STEEL CORPORATION, T...

1. An electric resistance welded steel pipe or steel tube including an electric resistance welded part, the steel pipe or
steel tube having a chemical composition comprising:
C: 0.03 to 0.59%, by mass %;
Si: 0.10 to 0.50%, by mass %;
Mn: 0.40 to 2.10%, by mass %;
Al: 0.01 to 0.35%, by mass %;
Ca: 0.0001 to 0.0040%, by mass %; and
remaining Fe and unavoidable impurities as a balance, the Si content and the Mn content being such that Mn/Si (mass ratio)
is in the range of 6.0 to 9.0,

wherein the steel pipe or steel tube has a tensile strength TS of not less than 434 MPa, and
in the electric resistance welded part the total amount of silicon, manganese, aluminum, calcium and chromium present in inclusions
having an equivalent circle diameter of 8 ?m or more is not more than 16 ppm in terms of mass % relative to the total mass
of a 2 mm wide portion of the electric resistance welded part including base iron.

US Pat. No. 9,833,826

PRESS FORMING METHOD

JFE STEEL CORPORATION, T...

1. A shrink-flanging press forming method of pressing and forming a formed part,
the formed part including:
a top portion having a projecting outer edge that projects outward, and
a flange portion that extends from the projecting outer edge and that is formed by bending the projecting outer edge,
the press forming method comprising:
a first forming step of forming a preformed part from a blank material, the preformed part including:
at least a portion of the projecting outer edge,
a vertical wall portion that extends from the at least a portion of the projecting outer edge, and
a trough portion that extends from the vertical wall portion, the trough portion being bent outward from the vertical wall
portion and being recessed on a side of the top portion, and

a second forming step of bending a region of the preformed part that includes the trough portion to form the flange portion
such that the vertical wall portion forms a part of the flange portion.

US Pat. No. 9,748,028

METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

JFE STEEL CORPORATION, T...

1. A method of producing a grain-oriented electrical steel sheet, the method comprising:
hot rolling a steel slab to form a hot rolled steel sheet, the steel slab having a chemical composition comprising:
C: 0.001 to 0.10, by mass %;
Si: 1.0 to 5.0, by mass %;
Mn: 0.01 to 0.5, by mass %;
Al: less than 0.0100, by mass %;
each of S, Se, O and N: not more than 0.050, by mass %; and
the remainder being Fe and inevitable impurities;
optionally hot band annealing the steel sheet;
subjecting the hot rolled sheet to a final thickness by (i) single cold rolling or (ii) two or more cold rollings including
an intermediate annealing therebetween;

primary recrystallization annealing the cold rolled steel sheet by heating at a heating rate of not more than 10° C./s for
a period of 1 to 7 seconds within a temperature zone in a range of 250° C. to less than 550° C. and rapidly heating at an
average heating rate in a range of 40 to 200° C./s at a temperature in a range of 550° C. to 700° C.; and

thereafter applying an annealing separator to perform final annealing.

US Pat. No. 9,732,395

INGOT FOR BEARING AND PRODUCTION PROCESS

JFE STEEL CORPORATION, T...

1. An ingot material for bearings comprising a chemical composition containing:
C: 0.56 mass % or more and 0.70 mass % or less;
Si: 0.15 mass % or more and less than 0.50 mass %;
Mn: 0.60 mass % or more and 1.50 mass % or less;
Cr: 0.50 mass % or more and 1.10 mass % or less;
Mo: 0.05 mass % or more and 0.5 mass % or less;
P: 0.025 mass % or less;
S: 0.025 mass % or less;
Al: 0.005 mass % or more and 0.500 mass % or less;
O: 0.0015 mass % or less;
N: 0.0030 mass % or more and 0.015 mass % or less; and
the balance including Fe and incidental impurities, wherein a degree of segregation defined by the following formula (1) is
2.8 or less, and a predicted value of the maximum diameter of inclusions present in 30000 mm2 of the ingot, as calculated by extreme value statistics, is 60 ?m or less:

CMo(max)/CMo(ave)?2.8  (1)

where CMo(max) represents a maximum value of Mo intensity and CMo(ave) represents an average value of Mo intensity.

US Pat. No. 9,683,838

ULTRASONIC MEASUREMENT METHOD AND ULTRASONIC MEASUREMENT APPARATUS

JFE STEEL CORPORATION, T...

1. An ultrasonic measurement method comprising:
a measuring point setting step of setting an arbitrary measuring point near a weld portion inside of steel material and assuming
a virtual reflecting surface that includes the measuring point and is parallel to a weld line direction;

a focused beam setting step of transmitting ultrasonic waves of a shear wave mode satisfying Expression 1 and focusing onto
the measuring point via a coupling medium at a predetermined incident angle with respect to the virtual reflecting surface;

a detecting step of detecting reflected waves of the transmitted ultrasonic waves at a boundary between a base metal portion
and the weld portion; and

an evaluating step of evaluating a shape of the weld portion based on the reflected waves:

where VT (mm/s) is sound velocity of the coupling medium,

VR (mm/s) is sound velocity of shear waves at the base metal portion of the steel material as a test subject,

D (mm) is a transmitting unit width in a direction orthogonal to the weld line direction,
F (mm) is a focal length in coupling medium conversion, and
?Hlim (degrees) is a deviation angle upper limit between the assumed reflecting surface and an actual reflecting surface.

US Pat. No. 9,534,271

HOT ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, (...

1. A method of manufacturing a hot rolled steel sheet comprising subjecting a semi-manufactured steel material to heating,
hot rolling including rough rolling and finish rolling, cooling after the completion of finish rolling, and coiling, thereby
producing a hot rolled steel sheet, wherein
the semi-manufactured steel material has a chemical composition including, by mass%,
C: 0.055% to 0.15%, Si: not more than 0.2%,
Mn: not more than 1.3%, P: not more than 0.03%,
S: not more than 0.007%, Al; not more than 0.1%,
N: not more than 0.01%, and Ti: 0.14% to 0.30%,
the contents of carbon, sulfur, nitrogen and titanium satisfying the inequality (1) below, the contents of niobium and boron
as impurities being Nb: less than 0.03% and B: less than 0.0005%, the balance comprising Fe and inevitable impurities,

the heating is performed at a heating temperature T (° C.) of not less than 1150°C., the heating temperature satisfying the
inequality (2) below, the semi-manufactured steel material being held at the temperature range of not less than 1150°C. for
15 minutes or more,

the hot rolling is performed with a total reduction ratio in a temperature range of 980°C. or below of not more than 40%,
the finish rolling is performed at a finish rolling temperature of not less than 880°C.,
the cooling is started within 3 seconds after the completion of finish rolling and is performed at an average cooling rate
of 40°C/sec, to 200°C/sec., and

the coiling is performed at a coiling temperature of 500°C. to 680°C.,
wherein:
1.0?([C]/12)/([Ti*]/48)  (1)
[Ti*]<10{?7000/(T+273)+2.75}/[C]  (2)

[Ti*]=[Ti]?3.4×[N]?1.5 ×[S]
T: heating temperature (° C.) for the semi-manufactured steel material ([C], [S], [N] and [Ti]: contents (mass %) of the respective
elements).

US Pat. No. 9,499,914

METHOD FOR MANUFACTURING ZINC OR ZINC ALLOY COATED STEEL SHEET AND ZINC OR ZINC ALLOY COATED STEEL SHEET MANUFACTURED BY THE METHOD

JFE STEEL CORPORATION, T...

1. A method for manufacturing a zinc or zinc alloy coated steel sheet, comprising:
preparing a surface-treatment liquid for a zinc or zinc alloy coated steel sheet, comprising components, by blending the components
such that solid mass contents calculated from respective masses of the components satisfy conditions (I) to (V), where the
surface-treatment liquid has a pH in the range of 3 to 6, the components including: (A) a resin emulsion formed of (A-1) a
cationic urethane resin emulsion having at least one type of cationic functional group selected from the group consisting
of primary to tertiary amino groups and quaternary ammonium group and/or (A-2) a non-ionic acrylic resin emulsion; (B) a tetraalkoxysilane;
(C) at least one type of silane coupling agent having at least one type of reactive functional group selected from the group
consisting of an active hydrogen-containing amino group, epoxy group, mercapto group, and methacryloxy group; (D) a chelating
agent; (E) a vanadate compound; (F) a titanium compound; and water; and

applying by coating the surface-treatment liquid to a surface of a zinc or zinc alloy coated steel sheet, heating and drying
the surface of the zinc or zinc alloy coated steel sheet such that a coating amount per surface is in the range of 200 to
1,000 mg/m2 to form a surface treatment coating film on the surface,

wherein the conditions (I) to (V) are as follows:
(I) solid content (AS) of the resin emulsion (A) with respect to the total solid content of the surface-treatment liquid is 10 to 45 mass %;

(II) solid mass ratio (CS/AS) of solid content (CS) of the s lane coupling agent (C) with respect to solid content (AS) of the resin emulsion (A) is 1.51 to 5.89;

(III) solid mass ratio (BS/DS) of solid content (BS) of the tetraalkoxysilane (B) with respect to solid content (DS) of the chelating agent (D) is 0.15 to 1.49;

(IV) solid mass ratio (EV/DS) of content (EV) of the vanadate compound (E) in terms of V with respect to solid content (DS) of the chelating agent (D) is 0.03 to 0.23; and

(V) solid mass ratio (FT/DS) of content (FT) of the titanium compound (F) in terms of Ti with respect to solid content (DS) of the chelating agent (D) is 0.02 to 0.19.

US Pat. No. 9,435,034

MANUFACTURING METHOD FOR STEEL SHEETS FOR CONTAINERS

JFE STEEL CORPORATION, T...

1. A method of manufacturing a steel sheet for containers which has a chemical conversion coating formed on the steel sheet
and containing 1 to 100 mg/m2 of zirconium metal and up to 0.1 mg/m2 of fluorine, the method comprising:
forming the chemical conversion coating on the steel sheet by subjecting the steel sheet to immersion in a treatment solution
containing zirconium ions, phosphate ions, phenolic resin and fluorine ions or to electrolytic treatment using the treatment
solution;

washing the steel sheet having the chemical conversion coating formed thereon with water at a temperature of 80° C. or more
but not more than 95° C.; and

drying the steel sheet.

US Pat. No. 9,873,934

HOT-DIP GALVANIZED STEEL SHEETS AND GALVANNEALED STEEL SHEETS THAT HAVE GOOD APPEARANCE AND ADHESION TO COATING AND METHODS FOR PRODUCING THE SAME

JFE Steel Corporation, T...

1. A hot-dip galvanized steel sheet having a base steel sheet and a galvanized layer, the base steel sheet having a composition
comprising, on a mass basis: C: 0.20% to 0.50%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%,
and S: 0.200% or less, a remainder being Fe and incidental impurities,
wherein the base steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having
a thickness of 0.6 ?m or more and 4 ?m or less on a ferrite side from an interface between ferrite and a galvanized layer,
the decarburized layer having a thickness of 3 ?m or more and 16 ?m or less on the ferrite side from the interface between
the ferrite and the galvanized layer, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing
Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.

US Pat. No. 9,840,749

HIGH STRENGTH GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

JFE Steel Corporation, T...

1. A high strength galvanized steel sheet, composed of a steel sheet having a chemical composition comprising, by mass %,
C: 0.02% or more and 0.30% or less, Si: 0.01% or more and 2.5% or less, Mn: 0.1% or more and 3.0% or less, P: 0.003% or more
and 0.08% or less, S: 0.01% or less, Al: 0.001% or more and 0.20% or less, Ti: 0.03% or more and 0.40% or less and the balance
being Fe and inevitable impurities, the steel sheet comprising a base steel sheet which is a hot-rolled steel sheet and a
zinc-coated layer on both surfaces of the base steel sheet, the zinc-coated layer having a coating weight per surface of 20
g/m2 or more and 120 g/m2 or less, wherein the concentration ratio of C to Ti (C/Ti) in a portion within 10 ?m from the surface of the base steel sheet
immediately under the zinc-coated layer is, in terms of atomic ratio, 0.8 or more and 1.5 or less, wherein the total amount
of oxides of one or more selected from Fe, Si, Mn, P, Al and Ti formed in a portion within 100 ?m from the surface of the
base steel sheet immediately under the zinc-coated layer is, in terms of oxygen amount, 0.05 g/m2 or less per side, and wherein a solid solution Ti concentration in a portion within 10 ?m from the surface of the base steel
sheet immediately under zinc-coated layer is, by mass %, 0.05% or less.

US Pat. No. 9,708,558

METHOD FOR PREPARING COAL FOR COKE MAKING

JFE STEEL CORPORATION, T...

1. A method for preparing coal for coke making, in which an individual brand of coal or caking additive is prepared at a time
prior to arrival at a coke plant, the individual brand of coal or caking additive being used alone or in mixture with another
coal as a raw material for coke making,
wherein, when the individual brand of coal or caking additive has a permeation distance of 15 mm or more, a size of particles
of the individual brand of coal or caking additive is controlled at the time prior to arrival at the coke plant so that a
content of particles having a diameter of 6 mm or more in the individual brand of coal or caking additive reaches 30% by mass
or less, the permeation distance being measured by a method including the following steps (A) to (D):

(A) crushing the individual brand of coal or caking additive until a content of particles having a diameter of 2 mm or less
reaches 100% by mass and then packing a vessel with the individual brand of coal or caking additive that has been crushed
at a bulk density of 0.8 g/cm3 and at a thickness of 10 mm to prepare a sample;

(B) arranging glass beads having a diameter of 2 mm on the sample at a thickness of the permeation distance or more;
(C) while applying a load of 50 kPa to an upper portion of the glass beads, performing heating in an inert gas atmosphere
from room temperature to 550° C. at a heating rate of 3° C./min; and

(D) measuring a permeation distance of the softened sample that has permeated a layer composed of the glass beads.

US Pat. No. 9,617,615

GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME

JFE Steel Corporation, T...

1. A grain-oriented electrical steel sheet before or after subjection to non-heat resistant magnetic domain refining treatment,
the grain-oriented electrical steel sheet comprising:
a steel sheet substrate formed by rolling;
a forsterite base film formed on a surface of the steel sheet substrate; and
an insulating tension coating formed on the forsterite base film, wherein
contents by mass % of Ti, Al, and Fe in the forsterite base film, obtained through quantitative analysis by applying correction
with a ZAF method to results of fluorescent X-ray analysis on the surface of the forsterite base film after removing the insulating
tension coating are each specified as FX(Ti), FX(Al), and FX(Fe), the following formulas (1) and (2) are satisfied,

FX(Ti)/FX(Al)?0.15  (1)
FX(Ti)/FX(Fe)?0.004  (2)
a frequency of crystal boundaries of secondary recrystallized grains in the steel sheet substrate in a width direction and
orthogonal to a rolling direction of the steel sheet substrate is 20 grain boundaries/100 mm or less,

a mean thickness of the forsterite base film is specified as t(Fo), and a thickness of the insulating tension coating is specified
as t(C), the following formula (3) is satisfied:

t(Fo)/t(C)?0.37  (3),

a coating amount M2of the insulating tension coating per steel sheet surface is 4.5 g/m2 or more, and

in the ZAF method, “Z” refers to a correction of fluorescent X-ray yield by an atomic number, “A” refers to a correction of
X-ray absorption of an observed wavelength by a coexistent element, and “F” refers to secondary excitation correction by a
fluorescent X-ray of a coexistent element.

US Pat. No. 9,593,393

RAIL HEAT TREATMENT DEVICE AND RAIL HEAT TREATMENT METHOD

JFE STEEL CORPORATION, T...

1. A rail heat treatment device comprising:
a cooling header that jets a cooling medium to a rail to be cooled;
an oscillation mechanism that relatively reciprocates the rail and the cooling header along a longitudinal direction of the
rail; and

a control system that performs oscillation control of the oscillation mechanism, the control system comprising:
a storage unit that stores therein at least information required for the oscillation control; and
a control unit that obtains a permissible range of required cooling time for the rail that satisfies a permissible range of
hardness of the rail based on a correlation expression representing a correlation between the cooling time for the rail with
the cooling header and the hardness of the rail after cooling, determines the required cooling time within the obtained permissible
range of required cooling time, controls a stroke and a speed of relative reciprocation of the rail and the cooling header
based on the determined required cooling time, and causes the oscillation mechanism to perform reciprocation by the stroke
and at the speed,

wherein the correlation expression is expressed by the following expression (1):
HV(h)=K×t+HV(n)  (1),

where:
HV(h): hardness of the rail after cooling with the cooling medium from the cooling headers,
HV(n): hardness of the rail after natural cooling without the cooling medium,
t: cooling time for the rail with the cooling medium from the cooling headers, and
K: a constant determined according to a type of the rail.
US Pat. No. 9,540,717

HIGH STRENGTH HOT-ROLLED STEEL SHEET FOR WELDED STEEL LINE PIPE HAVING EXCELLENT SOURING RESISTANCE, AND METHOD FOR PRODUCING SAME

JFE Steel Corporation, T...

1. A thick high-strength hot-rolled steel sheet for electric resistance welded line pipe having excellent sour resistance,
the thick high-strength hot-rolled steel sheet having a composition containing 0.01% to 0.07% C, 0.40% or less Si, 0.5% to
1.4% Mn, 0.015% or less P, 0.003% or less S, 0.1% or less Al, 0.01% to 0.15% Nb, 0.1% or less V, 0.03% or less Ti, 0.3% or
less Mo, 0.5% or less Cu, 0.5% or less Ni, and 0.008% or less N on a mass basis, the remainder being Fe and inevitable impurities;
Nb, V, and Ti satisfying the following inequality (1); Cm defined by the following equation (2) satisfying 0.12 or less; the
thick high-strength hot-rolled steel sheet having a microstructure containing a bainite phase or bainitic ferrite phase at
an area fraction of 95% or more, a thickness-wise maximum hardness of 220 HV or less, and a yield strength of 450 MPa or more:
Nb+V+Ti<0.15  (1)
Cm=C+Si/30+(Mn+Cu)/30+Ni60+Mo/7+V/10  (2)

where Nb, V, Ti, C, Si, Mn, Cu, Ni, Mo, and V are the content (mass percent) of each element.
US Pat. No. 9,528,187

STEEL SHEET FOR CONTAINERS AND MANUFACTURING METHOD FOR SAME

JFE STEEL CORPORATION, T...

1. A steel sheet for containers providing highly-formed film adhesiveness having a Zr compound film which is formed on a steel
sheet by immersing or electrolytically treating the steel sheet in a solution containing Zr ions, F ions and a glycolic acid,
wherein the adhesion amount of the Zr compound film is within a range of 0.1 mg/m2 to 100 mg/m2 as an amount of metal Zr, and is within a range of 0.1 mg/m2 or less as an amount of F, and is within 1.5 mg/m2 to 50 mg/m2 as an amount of C of a glycolic acid precipitate, and

after the formation of the Zr compound film, washing the resultant steel sheet with water having a temperature of 80° C. or
higher,

wherein said highly-formed film adhesiveness may be evaluated by laminating said steel sheet with resin-coat, manufacturing
the resin-coated steel sheet to a can body by drawing and ironing, and necking the neck portion of the can body to obtain
a peeled area ratio of 0% for the resin film at the neck portion of the can drum in a peeling test after a retort treatment
conducted at 120° C. for 30 minutes.

US Pat. No. 9,476,111

HOT DIP GALVANIZED STEEL SHEET

JFE Steel Corporation, (...

1. A hot dip galvanized steel sheet, comprising:
a steel sheet having a chemical composition containing, by mass %, C: 0.03% or more and 0.07% or less, Si: 0.10% or less,
Mn: 0.5% or more and 0.9% or less, P: 0.020% or more and 0.050% or less, S: 0.010% or less, Nb: 0.010% or more and 0.035%
or less, N: 0.005% or less, Al: 0.10% or less, and the balance being Fe and inevitable impurities,

a hot dip galvanizing layer containing 0.3 mass % or more and 0.6 mass % or less of Al which is formed on the surface of the
steel sheet, and

an intermetallic compound layer containing 0.12 gm?2 or more and 0.22 gm?2 or less of Al and Fe2Al5 having an average grain diameter of 1 ?m or less, the intermetallic compound being present between the steel sheet and the
hot dip galvanizing layer,

wherein a yield stress (YS) is 340 MPa or more and 420 MPa or less.
US Pat. No. 10,093,998

ABRASION RESISTANT STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS AND METHOD FOR MANUFACTURING THE SAME

JFE STEEL CORPORATION, T...

11. A method for manufacturing an abrasion resistant steel plate, the method comprising:casting a steel slab;
hot rolling the steel slab into a steel plate having a prescribed plate thickness; and
reheating the steel plate to a temperature of Ac3 transformation point or above and subsequently quenching the steel plate by water cooling at a temperature of not less than Ar3 transformation point to a temperature of not more than 250° C.,
wherein the steel slab has a chemical composition comprising:
C: 0.10 to less than 0.20%, by mass %;
Si: 0.05 to 0.5%, by mass %;
Mn: 0.5 to 1.5%, by mass %;
Cr: 0.05 to 1.20%, by mass %;
Nb: 0.01 to 0.08%, by mass %;
B: 0.0005 to 0.003%, by mass %;
Al: 0.01 to 0.08%, by mass %;
N: 0.0005 to 0.008%, by mass %;
P: not more than 0.05%, by mass %;
S: not more than 0.005%, by mass %;
O: not more than 0.008%, by mass %; and
remaining Fe and unavoidable inevitable impurities as a balance.
US Pat. No. 10,087,500

METHOD FOR MANUFACTURING HIGH-STRENGTH GALVANNEALED STEEL SHEET

JFE STEEL CORPORATION, T...

1. A method for manufacturing a galvannealed steel sheet, the method comprising:providing a steel sheet having a chemical composition comprising:
C: 0.01 or more and 0.20 or less, by mass %;
Si: 0.5 or more and 2.0 or less, by mass %;
Mn: 1.0 or more and 3.0 or less, by mass %; and
Fe and unavoidable impurities;
performing a first oxidation treatment on the steel sheet in a first zone having an atmosphere with an oxygen concentration in the range of more than 0 vol % and less than 1 vol % under conditions that an average heating rate of the steel sheet is in the range of 20° C./sec or more and a temperature T1 in the first zone is in the range of 400° C. to 500° C.;
thereafter performing a second oxidation treatment on the steel sheet in a second zone having an atmosphere with an oxygen concentration in the range of 1 vol % or more under conditions that an average heating rate of the steel sheet is in the range of less than 10° C./sec and a temperature T2 in the second zone is in the range of 600° C. to 780° C.;
thereafter reduction annealing and galvanizing the steel sheet to form a galvanized steel sheet; and
further performing an alloying treatment by heating the galvanized steel sheet at a temperature in the range of 460° C. to 600° C. for a duration in the range of 10 seconds to 60 seconds.