US Pat. No. 10,588,249

ELECTROMAGNETIC WAVE ABSORBING BODY AND METHOD FOR MANUFACTURING ELECTROMAGNETIC WAVE ABSORBING BODY

DAIDO STEEL CO., LTD., N...

1. An electromagnetic wave absorbing body comprising a sheet-like electromagnetic wave absorbing body in which particles comprising a soft magnetic material are dispersed in a matrix comprising a non-metal material,wherein the electromagnetic wave absorbing body satisfies a relationship: ???, in which ? is a parameter given by Equation (1):
?=Ad(??)0.5/(??+???/?)  (1)in which d is a thickness of the electromagnetic wave absorbing body, ?, ??, ?, and ?? are a permittivity of the electromagnetic wave absorbing body, a loss term of ?, a permeability of the electromagnetic wave absorbing body, and a loss term of ?, respectively, and A is equal to 8×104/?(?/m),wherein the electromagnetic wave absorbing body is configured to attenuate electromagnetic waves whose frequency is higher than or equal to 1 GHz and lower than or equal to 100 GHz, and
wherein a direction of the electromagnetic waves, to be absorbed by the electromagnetic wave absorbing body, is approximately parallel to a sheet surface of the electromagnetic wave absorbing body.
US Pat. No. 9,506,125

AIRCRAFT ENGINE SHAFT COMPRISING A MARAGING STEEL HAVING A TENSILE STRENGTH OF 2300MPA OR MORE

DAIDO STEEL CO., LTD., A...

1. An aircraft engine shaft comprising a maraging steel having a tensile strength of 2,300 MPa or more, an elongation of 7%
or more, and a Low Cycle Fatigue (LCF) fracture life of 17×104 cycle or more, and comprising:
0.10?C?0.30 mass %,
6.0?Ni?9.4 mass %,
11.0?Co?20.0 mass %,
1.0?Mo?6.0 mass %,
2.0?Cr?6.0 mass %,
0.5?Al?1.3 mass %, and
Ti?0.1 mass %,
with the balance being Fe and unavoidable impurities, and satisfying the following formula (1):
1.00?A?1.08  (1)
wherein A=0.95+0.35×[C]?0.0092×[Ni]+0.011×[Co]?0.02×[Cr]?0.001×[Mo],
in which [C] indicates a content of C in mass %, [Ni] indicates a content of Ni in mass %, [Co] indicates a content of Co
in mass %, [Cr] indicates a content of Cr in mass %, and [Mo] indicates a content of Mo in mass %, respectively.

US Pat. No. 9,199,402

PERMANENT MAGNET PRODUCTION METHOD

DAIDO STEEL CO., LTD., A...

1. A method for producing a plurality of permanent magnets, comprising:
with a mandrel inserted in a through hole formed in an extrusion die, extruding a preform filled in the through hole into
a filling space defined between an inner surface of the through hole and an outer surface of the mandrel by pressing the preform
with a pressing punch, thereby forming a cylindrical extruded form in which at least more than two stress concentration portions
extending in parallel along an extruding direction are formed so as to be spaced apart from each other in a circumferential
direction; and

applying an external force to the cylindrical extruded form obtained at two oppositely facing stress concentration portions
to thereby divide the extruded form at the stress concentration portions into more than two permanent magnets;

wherein said extruded form, which is formed so that a radial thickness T1 of the stress concentration portion is in a range of ?T0

US Pat. No. 9,196,413

REACTOR AND COMPOUND USED IN SAME

DAIDO STEEL CO., LTD., N...

1. A reactor comprising:
a core comprising a coil and a molded body,
wherein the coil comprises a wound electric wire,
wherein the molded body comprises a material for the core containing a soft magnetic powder, a resin binder, and a thermally
conductive fibrous filler having a higher thermal conductivity than that of the soft magnetic powder, mixed in a proportion
represented by following expression (1),

wherein the coil is embedded in an inner portion of the molded body without an interval to configure the reactor,
X·(soft magnetic powder)+Y·(thermally conductive filler)+(100-X-Y)·(resin binder). . .   expression (1)
wherein X is 83% to 96% by mass and Y is 0.2% to 6.8% by mass, and
wherein the soft magnetic powder comprises Si in a range from 0.2% to 9.0% by mass.

US Pat. No. 9,449,758

POWDER-FILLING SYSTEM

INTERMETALLICS CO., LTD.,...

1. A sintered magnet production method, comprising:
1) a powder-filling step for filling a container with alloy powder to be used as a material of a sintered magnet, the powder-filling
step including substeps of:

a) attaching a hopper for holding the alloy powder to the container in a removable and hermetically closable fashion with
a sieve member interposed between the hopper and the container, the hopper having an opening so that the hopper communicates
with the container at the opening for supplying the alloy powder to the container, the sieve member having a smaller openings
in a region near a side wall of the hopper than in a central region of the hopper;

b) supplying the alloy powder to the hopper;
c) supplying compressed inert gas in a pulsed form to the hopper, with the hopper attached to the container in a hermetically
closed fashion; and

2) an orienting step for orienting the alloy powder by applying a magnetic field to the alloy powder while holding the alloy
powder in the container without applying a mechanical pressure; and

3) a sintering step for sintering the alloy powder by heating the alloy powder while holding the alloy powder in the container
without applying a mechanical pressure.

US Pat. No. 9,384,890

POWDER-FILLING SYSTEM

INTERMETALLICS CO., LTD.,...

1. A system for filling a container with powder, including:
a) a hopper for holding the powder, the hopper having an opening configured to be attached to the container in a removable
and hermetically closable fashion so that the hopper communicates with the container at the opening for supplying the powder
to the container;

b) a powder supplier for supplying the powder to the hopper;
c) a gas supplier for repeatedly supplying compressed gas in a pulsed form to the hopper, with the hopper attached to the
container in a hermetically closed fashion; and

d) a sieve member provided at the opening, the sieve member having a smaller openings in a region near a side wall of the
hopper than in a central region of the hopper.

US Pat. No. 9,324,485

MATERIAL FOR ANISOTROPIC MAGNET AND METHOD OF MANUFACTURING THE SAME

DAIDO STEEL CO., LTD., A...

1. A hot plastically deformed anisotropic magnet having aligned axes of easy magnetization of crystal grains of the magnet,
the anisotropic magnet comprising:
(1) a T-based composition consisting of R, B, Ga, and a balance of T and inevitable impurities, wherein R is Pr or Pr that
is optionally substituted with at least one element selected from the group consisting of Nd, Dy, and Tb;

wherein an amount of R is 12.5 to 15 atomic percent;
an amount of B is 4.5 to 6.5 atomic percent; and
an amount of Ga is 0.1 to 0.7 atomic percent;
wherein T is Fe or Fe partially substituted with Co, and having
(2) a degree of magnetic alignment of 0.92 or more, wherein the degree of magnetization is defined by remanence (Br) / saturation
magnetization (Js), wherein the remanence (Br) is 1.20 T or more, and a coercivity is 1600 kA/m or more; and

(3) flattened crystal grains having a crystal grain diameter of 1 ?m or less, and wherein R contains at least 50 atomic percent
of Pr.

US Pat. No. 9,365,913

HIGH-HARDNESS HARDFACING ALLOY POWDER

DAIDO STEEL CO., LTD., A...

1. A high-hardness hardfacing alloy powder, comprising:
1.18?C?3.0 mass %,
0.5?Si?5.0 mass %,
10.0?Cr?30.0 mass %, and
16.0 40.0?Mo+Cr?70.0 mass % anda matrix of the high-hardness facing powder has both a Laves phase and a Cr-based carbide.

US Pat. No. 9,416,436

STEEL FOR STEAM TURBINE BLADE WITH EXCELLENT STRENGTH AND TOUGHNESS

DAIDO STEEL CO., LTD., A...

1. A steel for steam turbine blades which contains, in terms of % by mass,
0.02-0.10% of C,
up to 0.25% of Si,
0.001-0.10% of Mn,
up to 0.010% of P,
up to 0.010% of S,
8.8%-10% of Ni,
10.5-13.0% of Cr,
2.0-2.5% of Mo,
0.001-0.010% of N,
1.15-1.50% of Al,
less than 0.10% of Cu,
up to 0.20% of Ti, and
the remainder being incidental impurities and Fe, and which satisfies the following expression (1), expression (2), and expression
(3):

6.0?Ni/Al?8.0  expression (1)
9.0?Nieq?11.0  expression (2)
17.0?Creq?19.0  expression (3)wherein
Nieq=[Ni]+0.11[Mn]?0.0086([Mn]2)+0.44[Cu]+18.4[N]+24.5[C]

Creq=[Cr]+1.21[Mo]+0.48[Si]+2.2[Ti]+2.48[Al]
(wherein the atomic symbols in expression (1) and in the equations defining Nieq and Creq represent the contents in % by mass
of the respective elements).

US Pat. No. 9,202,618

INJECTION-MOLDED REACTOR AND COMPOUND USED IN SAME

DAIDO STEEL CO., LTD., N...

1. An injection-molded reactor, wherein a substance obtained by adding a low-melting-point resin B that has a melting point
of 150° C. or lower and has a lower melting point than that of a base resin A to the base resin A that is a highly heat-resistant
resin with a melting point of 150° C. or higher and that accounts for most of a thermoplastic resin is used as the thermoplastic
resin forming a resin binder; a compound for a core is obtained by mixing the base resin A and the low-melting-point resin
B with a soft magnetic powder in a proportion represented by the following expression (1); and the core is injection-molded
by using the compound in a state where a coil in which a electric wire is wound is embedded in an inner portion without an
interval to configure the injection-molded reactor,
X·(soft magnetic powder)+(100?X)·((100?Y)·(base resin A)+Y·(low-melting-point resin B))  expression (1)

wherein X is 83 to 96% by mass and Y is 2 to 40% by mass.

US Pat. No. 9,281,106

MATERIAL FOR ANISOTROPIC MAGNET AND METHOD OF MANUFACTURING THE SAME

DAIDO STEEL CO., LTD., A...

1. A hot plastically deformed anisotropic magnet having aligned axes of easy magnetization of crystal grains of the magnet,
the anisotropic magnet comprising:
(1) a T-based composition consisting of R, B, Ga, and a balance of T and inevitable impurities, wherein R is Pr or Pr that
is optionally substituted with at least one element selected from the group consisting of Nd, Dy, and Tb;

wherein an amount of R is 12.5 to 15 atomic percent;
an amount of B is 4.5 to 6.5 atomic percent; and
an amount of Ga is 0.1 to 0.7 atomic percent;
wherein T is Fe or Fe partially substituted with Co, and having
(2) a degree of magnetic alignment of 0.92 or more, wherein the degree of magnetization is defined by remanence (Br) / saturation
magnetization (Js), wherein the remanence (Br) is 1.20 T or more, and a coercivity is 1600 kA/m or more; and

(3) flattened crystal grains having a crystal grain diameter of 1 ?m or less, and wherein R contains at least 50 atomic percent
of Pr.

US Pat. No. 9,145,600

PRECIPITATION HARDENED HEAT-RESISTANT STEEL

DAIDO STEEL CO., LTD., N...

1. A heat-resistant bolt consisting essentially of, in terms of % by mass:
from 0.005 to 0.2% of C,
not more than 2% of Si,
from 1.8 to 3.55% of Mn,
15% or more and less than 20% of Ni,
from 10 to 15.50% of Cr,
more than 2% and up to 4% of Ti,
from 0.1 to 2% of Al, and
from 0.001 to 0.02% of B,
and optionally at least one of:
not more than 5% of Cu,
from 0.008 to 0.05% of N,
not more than 0.03% of Mg, and
not more than 0.03% of Ca,
with the balance being Fe and inevitable impurities,
wherein a ratio (Ni/Mn) of an amount of Ni to an amount of Mn is from 4.23 to 10,
wherein a total amount of Ni and Mn (Ni+Mn) is 18% or more and less than 25%, and
wherein a ratio (Ti/Al) of an amount of Ti to an amount of Al is from 2 to 20.

US Pat. No. 9,182,173

ARC FURNACE

DAIDO STEEL CO., LTD., A...

1. An arc furnace, comprising:
a furnace body having a bottomed cylindrical shape;
a furnace lid that openably closes an opening of the furnace body;
an electrode that is provided at the furnace lid and melts a metal material supplied into the furnace body by electric discharge;
a tilting floor that is tiltable within a plane substantially perpendicular to the tilting floor; and
a rotator that is provided on the tilting floor inward from an outer circumference of the furnace body to support a bottom
wall of the furnace body, and rotates the furnace body around a cylinder axis thereof,

the rotator comprises:
a ring body provided at an outer circumferential portion of a bottom wall of the furnace body,
a connecting portion formed on an inner circumferential surface of the ring body;
a bearing member that is provided at a necessary part of a bottom surface of the ring body to support the ring body rotatably
around a center thereof; and

a driver that is provided on the tilting floor inward of the ring body and has an output portion connected to the connecting
portion,

the ring body comprises a circular-ring-shaped support frame, and a gear body fixed to a bottom surface of an inner circumferential
portion of the support frame,

the connecting portions comprise tooth profiles formed on the entire circumference of the inner circumferential portion of
the support frame,

the gear body comprises:
the tooth profiles,
an outer circumferential intermediate portion protruding outward as a rectangular section and providing an inner ring portion
of the bearing member, and

an outer ring portion with a U-shaped section wrapping the inner ring portion,
a roller bearing interposed between a concave surface of the outer ring portion, top and bottom surfaces, and an outer peripheral
edge surface of the inner ring portion, and

the outer ring portion having a bottom surface fixed to the tilting floor.

US Pat. No. 9,368,277

METHOD FOR PRODUCING RFEB-BASED MAGNET

DAIDO STEEL CO., LTD., A...

1. A method for producing an RFeB-based magnet, the method comprising:
disposing a nozzle so as to be opposed to an attachment surface of a base material, which is held by a base material holding
unit so that the attachment surface faces upward, which has an upwardly convex arc shape in a cross-section, and which is
a sintered magnet or hot-plastic worked magnet composed of an RFeB-based magnet containing a light rare earth element RL that is at least one element selected from the group consisting of Nd and Pr, Fe, and B;

transporting the base material holding unit using a base material transporting unit so that the base material holding unit
is immediately below a nozzle head of the nozzle;

extruding a mixture, which is obtained by mixing an organic solvent, which is a silicone grease or flowable paraffin, and
an RH-containing powder containing a heavy rare earth element RH that is at least one element selected from the group consisting of Dy, Tb and Ho, from the nozzle, by moving a valve element
or a piston or by pressure when receiving an electrical signal, while moving the nozzle with respect to the attachment surface
so as to attach the mixture to the attachment surface;

transporting the base material holding unit away from immediately below the nozzle head of the nozzle using the base material
transporting unit;

transporting, using the base material transporting unit, a subsequent base material holding unit, which holds base material
that has an attachment surface facing upward, so that the subsequent base material holding unit is immediately below the nozzle
head of the nozzle and so that the mixture is attached to an attachment surface of a plurality of base materials; and

heating the base material together with the mixture.

US Pat. No. 9,738,965

RFEB SYSTEM SINTERED MAGNET PRODUCTION METHOD AND RFEB SYSTEM SINTERED MAGNET

INTERMETALLICS CO., LTD.,...

1. A method for producing an RFeB system sintered magnet, comprising:
preparing a paste by mixing an organic matter having a molecular structure including an oxygen atom and a metallic powder
containing a heavy rare-earth element RH which is at least one element selected from a group of Dy, Ho and Tb, and applying the paste to a surface of an RFeB system
sintered compact composed of crystal grains whose main phase is R2Fe14B containing, as a main rare-earth element R, a light rare-earth element RL which is at least one element selected from a group of Nd and Pr;

performing a heating process for a grain boundary diffusion treatment, with the paste in contact with the surface; and
leaving a protective layer containing an oxide of the light rare-earth element RL that is formed on the surface of the RFeB system sintered compact by the heating process.

US Pat. No. 9,738,953

HOT-FORGEABLE NI-BASED SUPERALLOY EXCELLENT IN HIGH TEMPERATURE STRENGTH

DAIDO STEEL CO., LTD., A...

1. A hot-forgeable Ni-based superalloy, comprising, in terms of % by mass:
C: more than 0.001% and less than 0.100%,
Cr: 11.0% or more and less than 19.0%,
Co: 6.5% or more and less than 22.0%,
Fe: 0.5% or more and less than 10.0%,
Si: less than 0.1%,
Mo: more than 2.0% and less than 5.0%,
W: more than 1.0% and less than 5.0%,
Mo+½W: 2.5% or more and less than 5.5%,
S: 0.010% or less,
Nb: 0.3% or more and less than 2.0%,
Al: more than 3.00% and less than 6.50%, and
Ti: 0.20% or more and less than 2.49%,
with the balance being Ni and unavoidable impurities,wherein (Ti/Al)×10 is 0.2 or more and less than 4.0 in terms of atomic ratio,wherein Al+Ti+Nb is 8.5% or more and less than 13.0% in terms of atomic %; andwherein
the hot-forgeable Ni-based superalloy has a ?? amount of from 34 mol % to 45 mol %; and
the hot-forgeable Ni-based superalloy has a solid solution temperature of ?? of from 1,020° C. to 1,080° C.

US Pat. No. 10,001,324

METHOD OF OPERATING ELECTRIC ARC FURNACE

DAIDO STEEL CO., LTD., A...

1. A method of operating an electric arc furnace,wherein the electric arc furnace comprises:
(a) a furnace shell that includes a cylindrical circumferential wall portion, a furnace bottom portion and a tapping hole;
(b) a furnace roof that has a plurality of electrodes provided so as to face downwards; and
(c) a rotating apparatus that rotates the furnace shell around a vertical axis relative to the electrodes,
wherein the method comprises:
a charging step of, above the furnace shell, opening an opening-and-closing door on a bottom portion of a scrap bucket, which contains a metal material, to form an opening, and falling the metal material into the furnace shell via the opening, and
a melting step of melting the metal material, and
wherein the furnace shell is rotated by the rotating apparatus until achieving a positional relationship in which a direction of a line connecting a center of the furnace shell to a center of the tapping hole intersects an extension direction of a seam at a closing side of the opening-and-closing door of the scrap bucket, then the opening-and-closing door of the scrap bucket is opened in this positional relationship, and the metal material is charged.
US Pat. No. 9,745,649

HEAT-RESISTING STEEL FOR EXHAUST VALVES

DAIDO STEEL CO., LTD., A...

1. A heat-resistant steel for exhaust valves, consisting of:
0.45?C<0.60 mass %,
0.30 19.0?Cr<23.0 mass %,
5.0?Ni<9.0 mass %,
8.5?Mn<10.0 mass %,
2.5?Mo<4.0 mass %,
0.01?Si<0.50 mass %, and
0.01?Nb<0.30 mass %,
with the balance being Fe and unavoidable impurities;
the heat-resistant steel for exhaust valves satisfying 0.02?Nb/C?0.61 and 4.5?Mo/C?8.0.

US Pat. No. 9,593,404

NITROCARBURIZED CRANKSHAFT AND METHOD OF MANUFACTURING THE SAME

DAIDO STEEL CO., LTD., A...

2. A method of manufacturing a nitrocarburized crankshaft which is obtained by
subjecting a bainitic microalloyed steel to a forging and a machining, and
further subjecting the bainitic microalloyed steel to at least a strain releasing heat treatment and
a subsequent nitrocarburizing treatment,
the bainitic microalloyed steel containing, as essentially added elements, in terms of mass %:
0.16% to 0.40% of C;
0.13% to 1.0% of Si;
1.0% to 2.0% of Mn;
0.05% to 0.40% of Mo; and
0.05% to 0.30% of V, and the bainitic microalloyed steel optionally further containing, as arbitrarily added elements, in
terms of mass %:

0.01% to 0.1% of S;
0.005% to 0.2% of Ti;
0.001% to 0.03% of Al;
0.50% or less of Cr;
0.5% or less of Cu; and
0.5% or less of Ni,
with the balance being Fe and unavoidable impurities,
wherein at least a content of P as one of the unavoidable impurities is suppressed to be 0.025% or less,
wherein the microalloyed steel is selected so as to satisfy:
[C]+0.27[Mn]+0.32[Cr]+0.27[Mo]+0.38[V]?0.72,
[C]+0.01[Si]+0.09[Mn]+0.13[Cr]+0.12[Mo]+0.28[V]<0.65, and
[C]+0.11[Si]+0.11[Mn]+0.09[Cr]+0.21[Mo]+0.60[V]?0.54,
in which [M] represents a content of element M in terms of % by mass, and
wherein the strain releasing heat treatment is performed to satisfy the following expressions regarding a holding temperature
T (° C.) and a holding time t (hr):

21.6+14.2[C]+1.5[Si]+2.6[Mn]+6.5[Cr]+2.7[Mo]+1.6[V]+10?7×?h12?3.7×10?3×?h1<0.70,

and
?h1=(T+273)×(20+Log(t).

US Pat. No. 9,738,954

TURBINE WHEEL OF AUTOMOTIVE TURBOCHARGER AND METHOD FOR PRODUCING THE SAME

DAIDO STEEL CO., LTD., A...

1. A turbine wheel of an automotive turbocharger, comprising a Ni-based alloy having a composition which contains, in terms
of mass %:
C: 0.08 to 0.20%;
Mn: 0.25% or less;
Si: 0.01 to 0.50%;
Cr: 12.0 to 14.0%;
Mo: 3.80 to 5.20%;
Nb+Ta: 1.80 to 2.80%;
Ti: 0.50 to 1.00%;
Al: 5.50 to 6.50%;
B: 0.005 to 0.015%;
Zr: 0.05 to 0.15%; and
Fe: 0.01 to 2.5%,
with the remainder being Ni and unavoidable impurities,
wherein the turbine wheel comprises a wing part and a shaft part, and
a size of ?? phase in each site of from a tip of the wing part to the shaft part is structure-controlled so as to fall within
a range of from 0.4 to 0.8 ?m.

US Pat. No. 9,670,787

TI—AL-BASED HEAT-RESISTANT MEMBER

DAIDO STEEL CO., LTD., A...

1. A Ti—Al-based heat-resistant member comprising a Ti—Al-based alloy which comprises:
28.0 mass % to 35.0 mass % of Al;
1.0 mass % to 15.0 mass % of at least one selected from the group consisting of Nb, Mo, W and Ta;
0.1 mass % to 5.0 mass % of at least one selected from the group consisting of Cr, Mn and V; and
0.1 mass % to 1.0 mass % of Si,
with the balance being Ti and unavoidable impurities,
wherein a whole or a part of a surface of the Ti—Al-based heat-resistant member includes a hardened layer as a surface layer,
said hardened layer having a higher hardness than an inside of the Ti—Al-based heat-resistant member, and

the Ti—Al-based heat-resistant member has a hardness ratio represented by the following expression (a) of 1.4 to 2.5:
Hardness ratio=HVS/HVI  (a)

in which HVS is a hardness of the surface layer and is a Vickers hardness measured at a site located at a distance of 0.02 mm±0.005 mm
from the surface of the Ti—Al-based heat-resistant member (load: 0.98 N), and

HVI is a hardness of the inside of the Ti—Al-based heat-resistant member and is a Vickers hardness measured at a site located
at a distance of 0.50 mm±0.10 mm from the surface of the Ti—Al-based heat-resistant member (load: 0.98 N).

US Pat. No. 9,595,635

POINT SOURCE LIGHT-EMITTING DIODE

DAIDO STEEL CO., LTD., N...

1. A point source light-emitting diode comprising:
a support substrate, a metal layer, a first conduction-type layer, an active layer, a second conduction-type layer containing
a current-narrowing structure, and a topside electrode having an aperture, stacking in this order,

wherein the metal layer has a metal reflection face by which a light generated in the active layer is reflected towards the
aperture side,

wherein the point source light-emitting diode further comprises a light-reflection reduction face having a lower reflectivity
and/or a higher absorptivity than the metal reflection face, provided around the metal reflection face,

wherein the metal reflection face is provided locally in an area corresponding to the aperture,
wherein a first portion of light rays directed towards the support substrate from a region of the active layer is reflected
by the metal reflection face, and

wherein a second portion of light rays directed towards the support substrate is absorbed by the light-reflection reduction
face without being reflected.

US Pat. No. 10,119,182

NI-BASED SUPERALLOY FOR HOT FORGING

DAIDO STEEL CO., LTD., N...

1. An Ni-based superalloy for hot forging, having a component composition consisting of, in terms of % by mass,C: more than 0.001% and less than 0.100%,
Cr: 11% or more and less than 19%,
Co: more than 5% and less than 25%,
Fe: 0.1% or more and less than 4.0%,
Mo: more than 2.0% and less than 5.0%,
W: more than 1.0% and less than 5.0%,
Nb: more than 2.6% and less than 3.2%,
Al: more than 3.0% and less than 5.0%, and
Ti: more than 1.0% and less than 3.0%,
with the balance being unavoidable impurities and Ni,
wherein, when a content of an element M in terms of atomic % is represented by [M], the component composition satisfies the following two relationships:
5.0?([Ti]+[Nb])/[Al]×10<6.5 and
10.1?[Al]+[Ti]+[Nb]?11.6.

US Pat. No. 10,101,089

ELECTRIC ARC FURNACE

DAIDO STEEL CO., LTD., A...

1. An electric arc furnace, comprising:a furnace shell;
an electrode;
a furnace shell moving mechanism that supports the furnace shell so as to be movable on an installation surface, the furnace shell moving mechanism comprising:
a first part being fixed with respect to the installation surface;
a second part being fixed to the furnace shell and being movable with respect to the first part; and
the first part being electrically connected to the second part;
a first insulation that electrically insulates between the furnace shell and the furnace shell moving mechanism; and
a connecting wire that electrically connects between the first part and the second part of the furnace shell moving mechanism;
the connecting wire having a length capable of following an entire movable range of the second part.

US Pat. No. 9,903,653

MELTING FURNACE

DAIDO STEEL CO., LTD., A...

1. A melting furnace, comprising:
a furnace shell;
a furnace shell moving mechanism that supports the furnace shell so as to be movable on an installation surface;
a pipe or a wiring that has one end fixed to the furnace shell and has at least partially a flexible portion; and
a stand that comprises a supporting part that supports a halfway portion of the pipe or the wiring, and a stand moving part
that is coupled to the supporting part, the stand moving part comprising a wheel that moves the supporting part on the installation
surface with movement of the furnace shell, wherein the stand is mounted on the installation surface so as to be movable in
an up-down direction with respect to the furnace shell, and

a coupler comprising a furnace shell side-coupler fixed to the furnace shell, a stand side-coupler fixed to the stand, and
a coupling shaft directly connecting the furnace shell side-coupler and the stand side-coupler.

US Pat. No. 9,771,643

CARBURIZED PART, METHOD FOR MANUFACTURING THEREOF, AND STEEL FOR CARBURIZED PART

HONDA MOTOR CO., LTD., T...

1. A carburized part comprising a carburized layer formed by performing a carburizing treatment to an outer surface of steel,
the steel consisting of, in terms of % by mass:
0.15% to 0.25% of C,
0.15% or less of Si,
0.4% to 1.1% of Mn,
0.8% to 1.4% of Cr,
0.25% to 0.55% of Mo,
0.015% or less of P,
0.035% or less of S, and
a remainder of Fe and unavoidable impurities,and the steel satisfying the following relation:
0.10?[Mo]/(10[Si]+[Mn]+[Cr])?0.40
wherein [M] represents a content of element M in terms of % by mass,
wherein, in the carburized part, a maximum C content of the carburized layer in terms of % by mass is within a range of 0.61%
to 0.75%, and

wherein
a hardness HVd=25 ?m at a depth of 25 ?m below the outer surface of the steel is 650 Hv or higher,

a hardness HVd=50 ?m at a depth of 50 ?m below the outer surface of the steel is 750 Hv or lower,

a difference between the hardness HVd=25 ?m and the hardness Hvd=50 ?m is 50 Hv or smaller, and

the hardness HVd=25 ?m is less than the hardness Hvd=50 ?m.

US Pat. No. 9,773,590

RFEB-BASED MAGNET AND METHOD FOR PRODUCING RFEB-BASED MAGNET

DAIDO STEEL CO., LTD., A...

1. A combined RFeB-based magnet, comprising:
a first unit magnet;
a second unit magnet; and
an interface material that bonds the first unit magnet and the second unit magnet,
wherein the first unit magnet and the second unit magnet are RFeB-based magnets containing a light rare earth element RL that is at least one element selected from the group consisting of Nd and Pr, Fe, and B,

wherein the interface material contains at least one compound selected from the group consisting of a carbide, a hydroxide,
and an oxide of the light rare earth element RL, and

wherein an amount of a heavy rare earth element RH that is at least one element selected from the group consisting of Dy, Tb and Ho in the first unit magnet is 0% by mass to
less than 2.0% by mass and an amount of the heavy rare earth element RH in the second unit magnet is 2.0% by mass to 5% by mass,

wherein a squareness ratio Hk/Hcj that is a ratio of a magnetic field Hk corresponding to 90% of a residual magnetic flux density Br to a coercive force Hcj in a second quadrant of a magnetization curve is 90% or more, and

wherein a volume ratio of the second unit magnet to the combined RFeB-based magnet is 35% or less.
US Pat. No. 10,260,137

METHOD FOR PRODUCING NI-BASED SUPERALLOY MATERIAL

DAIDO STEEL CO., LTD., N...

1. A method for producing a precipitation strengthened Ni-based superalloy material having a component composition consisting of, in terms of % by mass:C: more than 0.001% and less than 0.100%,
Cr: 11% or more and less than 19%,
Co: more than 5% and less than 25%,
Fe: 0.1% or more and less than 4.0%,
Mo: more than 2.0% and less than 5.0%,
W: more than 1.0% and less than 5.0%,
Nb: 2.0% or more and less than 4.0%,
Al: more than 3.0% and less than 5.0%,
Ti: more than 1.0% and less than 2.5%, and
with the balance being unavoidable impurities and Ni,
wherein, when a content of an element M in terms of atomic % is represented by [M], a value of ([Ti]+[Nb])/[Al]×10 is 3.5 or more and less than 6.5, and a value of [Al]+[Ti]+[Nb] is 9.5 or more and less than 13.0,
the method comprising:
a blooming forging step of performing a forging at a temperature range of from a solvus temperature Ts that is a solid solution temperature of the ?? phase to a melting point Tm, and performing an air cooling to form a billet having an average crystal grain size of #1 or more,
an overaging thermal treatment step of heating and holding the billet at a temperature range of from Ts to Ts+50° C. and then slowly cooling it to a temperature Ts? that is Ts or lower so that ??-phase grains are allowed to precipitate and grow and to increase an average interval thereof, and
a crystal grain fining forging step of performing another forging at a temperature range of from Ts?150° C. to Ts and performing another air cooling,
wherein Ts is from 1,030° C. to 1,100° C., and
wherein crystal growth is suppressed by the ??-phase grains resulting from the overaging thermal treatment to result in an overall average crystal grain size of #8 or more after the crystal grain fining forging step.
US Pat. No. 10,227,669

MARAGING STEEL

DAIDO STEEL CO., LTD., N...

1. A maraging steel consisting of:as essential components,
0.20 mass %?C5.1?0.35 mass %,
9.0 mass %?Co?20.0 mass %,
1.0 mass %?(Mo+W/2)?2.0 mass %,
1.0 mass %?Cr?4.0 mass %, and
a certain amount of Ni, and
as optional components,
Al?0.10 mass %,
Ti?0.10 mass %,
S?0.0010 mass %,
N?0.0020 mass %,
V+Nb?0.60 mass %,
B?0.0050 mass %, and
Si?1.0 mass %,
with a balance being Fe and inevitable impurities,
wherein, in a case where contents of V and Nb satisfy V+Nb?0.020 mass %, an amount of Ni is:
6.0 mass %?Ni?9.4 mass %, and
wherein, in a case where the contents of V and Nb satisfy0.020 mass %

US Pat. No. 10,119,186

MARAGING STEEL EXCELLENT IN FATIGUE CHARACTERISTICS

DAIDO STEEL CO., LTD., A...

1. A maraging steel, consisting of, in terms of % by mass:C: ?0.015%,
Ni: 12.0 to 20.0%,
Mo: 3.0 to 6.0%,
Co: 5.0 to 13.0%,
Al: 0.01 to 0.3%,
Ti: 0.2 to 2.0%,
O: ?0.0020%,
N: 0.0005 to 0.0020%,
Zr: from 0.001 to 0.02%, and optionally one or more of:
B: from 0.0010 to 0.010%,
Mg: ?0.003%, and
Ca: ?0.003%
with the balance being Fe and unavoidable impurities,
wherein the maraging steel comprises at least one TiN or TiCN inclusion with ZrO2 present in a center part thereof.

US Pat. No. 9,976,808

METHOD OF OPERATING ELECTRIC ARC FURNACE

DAIDO STEEL CO., LTD., A...

1. A method of operating an electric arc furnace,wherein the electric arc furnace comprises:
(a) a furnace shell that includes a cylindrical circumferential wall portion, a furnace bottom portion and a tapping hole;
(b) a furnace roof that has a plurality of electrodes provided so as to face downwards; and
(c) a rotating apparatus that rotates the furnace shell around a vertical axis relative to the electrodes,
wherein the method comprises:
a charging step of, above the furnace shell, opening an opening-and-closing door on a bottom portion of a scrap bucket, which contains a metal material, to form an opening, and falling the metal material into the furnace shell via the opening, and
a melting step of melting the metal material, and
wherein the furnace shell is rotated by the rotating apparatus until achieving a positional relationship in which a direction of a line connecting a center of the furnace shell to a center of the tapping hole intersects an extension direction of a seam at a closing side of the opening-and-closing door of the scrap bucket, then the opening-and-closing door of the scrap bucket is opened in this positional relationship, and the metal material is charged.
US Pat. No. 9,903,981

LAMINATED BODY

DAIDO STEEL CO., LTD., A...

1. A laminated body comprising at least:
(a) a transparent substrate,
(b) a first metal layer that is overlaid on the substrate and forms an electrode, and
(c) a second metal layer having a light reflectance of 20% or less, wherein the second metal layer is overlaid on the surface
of the first metal layer opposite to the substrate or between the first metal layer and the substrate by sputtering using
a reactive sputtering gas,

wherein the second metal layer is constituted by an oxide or nitride of a Cu alloy comprising at least Zn.

US Pat. No. 9,818,513

RFEB-BASED MAGNET AND METHOD FOR PRODUCING RFEB-BASED MAGNET

DAIDO STEEL CO., LTD., A...

1. A combined RFeB-based magnet, comprising:
a first unit magnet;
a second unit magnet; and
an interface material that bonds the first unit magnet and the second unit magnet,
wherein the first unit magnet and the second unit magnet are RFeB-based magnets containing a light rare earth element RL that is at least one element selected from the group consisting of Nd and Pr, Fe, and B,

wherein the interface material contains at least one compound selected from the group consisting of a carbide, a hydroxide,
and an oxide of the light rare earth element RL, and

wherein an amount of a heavy rare earth element RH that is at least one element selected from the group consisting of Dy, Tb and Ho in the first unit magnet is 0% by mass to
less than 2.0% by mass and an amount of the heavy rare earth element RH in the second unit magnet is 2.0% by mass to 5% by mass,

wherein a squareness ratio Hk/Hcj that is a ratio of a magnetic field Hk corresponding to 90% of a residual magnetic flux density Br to a coercive force Hcj in a second quadrant of a magnetization curve is 90% or more, and

wherein a volume ratio of the second unit magnet to the combined RFeB-based magnet is 35% or less.

US Pat. No. 10,617,046

ELECTROMAGNETIC WAVE ABSORBING BODY AND METHOD FOR MANUFACTURING ELECTROMAGNETIC WAVE ABSORBING BODY

DAIDO STEEL CO., LTD., N...

1. An electromagnetic wave absorbing body comprising a sheet-like electromagnetic wave absorbing body in which particles comprising a soft magnetic material are dispersed in a matrix comprising a non-metal material,wherein the electromagnetic wave absorbing body satisfies a relationship: ???, in which ? is a parameter given by Equation (1):
?=Ad(??)0.5/(??+???/?)  (1)in which d is a thickness of the electromagnetic wave absorbing body, ?, ??, ?, and ?? are a permittivity of the electromagnetic wave absorbing body, a loss term of ?, a permeability of the electromagnetic wave absorbing body, and a loss term of ?, respectively, and A is equal to 8×104/?(?/m),wherein the electromagnetic wave absorbing body is configured to attenuate electromagnetic waves whose frequency is higher than or equal to 1 GHz and lower than or equal to 100 GHz, and
wherein a direction of the electromagnetic waves, to be absorbed by the electromagnetic wave absorbing body, is approximately parallel to a sheet surface of the electromagnetic wave absorbing body.

US Pat. No. 10,173,258

STEEL FOR MOLD, AND MOLD

DAIDO STEEL CO., LTD., A...

1. A steel for a mold, having a composition comprising, on a % by mass basis:0.28%?C<0.38%,
0.01% 0.92% 0.8% 0.8% 0.31%?V<0.58%,
with the balance being Fe and inevitable impurities,
having a coefficient of thermal conductivity at 25° C., evaluated by a laser flash method, of 28 W/m/K or higher, and being used as a material for manufacturing a mold by additive manufacturing.

US Pat. No. 10,234,206

ELECTRIC ARC FURNACE

DAIDO STEEL CO., LTD., A...

1. An electric arc furnace, comprising:a furnace shell;
an electrode;
a furnace shell moving mechanism that supports the furnace shell so as to be movable on an installation surface, the furnace shell moving mechanism comprising:
a first part being fixed with respect to the installation surface;
a second part being fixed to the furnace shell and being movable with respect to the first part; and
the first part being electrically connected to the second part;
a first insulation that electrically insulates between the furnace shell and the furnace shell moving mechanism; and
a connecting wire that electrically connects between the first part and the second part of the furnace shell moving mechanism;
the connecting wire having a length capable of following an entire movable range of the second part.
US Pat. No. 10,260,119

MARAGING STEEL

DAIDO STEEL CO., LTD., N...

1. A maraging steel consisting of:as essential components,
0.20 mass %?C5.1?0.35 mass %,
9.0 mass %?Co?20.0 mass %,
1.0 mass %?(Mo+W/2)?2.0 mass %,
1.0 mass %?Cr?4.0 mass %, and
a certain amount of Ni, and
as optional components,
Al?0.10 mass %,
Ti?0.10 mass %,
S?0.0010 mass %,
N?0.0020 mass %,
V+Nb?0.60 mass %,
B?0.0050 mass %, and
Si?1.0 mass %,
with a balance being Fe and inevitable impurities,
wherein, in a case where contents of V and Nb satisfy V+Nb?0.020 mass %, an amount of Ni is:
6.0 mass %?Ni?9.4 mass %, and
wherein, in a case where the contents of V and Nb satisfy0.020 mass %

US Pat. No. 10,508,327

MOLD STEEL AND MOLD

DAIDO STEEL CO., LTD., A...

1. A mold steel having a composition comprising, in terms of mass %:0.220%?C?0.360%;
0.65%?Si<1.05%;
0.43%?Mn?0.92%;
0.43%?Ni?0.92%;
0.67%?Mn+Ni?1.30%;
10.50%?Cr<12.50%;
0.05%?Mo<0.50%;
0.002%?V<0.50%;
0.001%?N?0.048%; and
0.300%?C+N?0.420%,
with the remainder being Fe and unavoidable impurities.

US Pat. No. 10,287,668

CASE HARDENING STEEL

DAIDO STEEL CO., LTD., A...

1. A steel comprising, in terms of % by mass:C: 0.10% to 0.30%,
Si: 0.01% to 1.50%,
Mn: 0.40% to 1.50%,
S: 0.01% to 0.10%,
P: 0.03% or less,
Cu: 0.05% to 1.00%,
Ni: 0.05% to 1.00%,
Cr: 1.12% to 2.00%,
Mo: 0.01% to 0.50%,
Nb: 0.001% or less,
s-Al: 0.005% to 0.050%,
N: 0.005% to 0.030%, and
at least one element selected from Ti: 0.001% to 0.150% and Zr: 0.001% to 0.300%,
with the balance being Fe and unavoidable impurities, wherein the case-hardening steel satisfies the following expression (1);
|[Ti]/47.9+[Zr]/91.2?[N]/14|/100?3.5×10?6  (1)
where [Ti], [Zr], and [N] represent the content, in terms of % by mass, of each of these elements in the case-hardening steel,
wherein
a total amount of TiC, ZrC, and AlN, which are precipitate particles contained in 100 g of hot rolled steel after subjecting the case-hardening steel to the hot rolling step and before subjecting the hot rolled steel to the carburizing step, is 3.5×10?4 mole or less,
a difference between the highest and the lowest of grain size indexes in accordance with JIS G 0551 (1998) of crystal grains in the case-hardened steel is 6 or less, and
the steel is subjected to surface hardening treatment by carburization.

US Pat. No. 10,215,494

METHOD OF OPERATING ELECTRIC ARC FURNACE

DAIDO STEEL CO., LTD., A...

1. A method of operating an electric arc furnace, wherein the electric arc furnace comprises:(a) a furnace shell that includes a charging opening, a cylindrical circumferential wall portion and a furnace bottom portion, and a tapping hole and/or a slag door,
(b) a furnace roof that has a plurality of electrodes provided so as to face downwards, and
(c) a rotating apparatus that rotates the furnace shell around a vertical axis relative to the electrodes,
in which a metal material charged into the furnace shell is melted by heat of arcs formed between the electrodes and the metal material, wherein the method comprises:
charging the metal material into the furnace shell via the charging opening, and thereafter,
rotating the furnace shell relative to the electrodes during melting of the metal material, and
stopping the rotation when any one of the plurality of electrodes reaches a holding position that is previously set relative to the tapping hole or the slag door, and holding the furnace shell at the holding position,
in the case where the holding position is set relative to the tapping hole, the holding position is set in such a position that an extension line of a line connecting a rotational center of the furnace shell to any one of the plurality of electrodes is positioned in a range within ±50° in a rotation direction of the furnace shell, centered at a line connecting the rotational center of the furnace shell to a center of the tapping hole, and
in the case where the holding position is set relative to the slag door, the holding position is set in such a position that the extension line of the line connecting the rotational center of the furnace shell to any one of the plurality of electrodes one electrode is positioned in a range of an angle of less than 60° from an end of the slag door in the rotation direction of the furnace shell.
US Pat. No. 10,344,367

METHOD FOR PRODUCING NI-BASED SUPERALLOY MATERIAL

DAIDO STEEL CO., LTD., N...

1. A method for producing a precipitation strengthened Ni-based superalloy material having a component composition consisting of, in terms of % by mass:C: more than 0.001% and less than 0.100%,
Cr: 11% or more and less than 19%,
Co: more than 5% and less than 25%,
Fe: 0.1% or more and less than 4.0%,
Mo: more than 2.0% and less than 5.0%,
W: more than 1.0% and less than 5.0%,
Nb: 0.3% or more and less than 4.0%,
Al: more than 3.0% and less than 5.0%,
Ti: more than 1.0% and less than 2.5%, and
Ta: 0.01% or more and less than 2.0%,
with the balance being unavoidable impurities and Ni,
wherein, when a content of an element M in terms of atomic % is represented by [M], a value of ([Ti]+[Nb]+[Ta])/[Al]×10 is 3.5 or more and less than 6.5, and a value of [Al]+[Ti]+[Nb]+[Ta] is 9.5 or more and less than 13.0,
the method comprising:
a blooming forging step of performing a forging at a temperature range of from a solvus temperature Ts that is a solid solution temperature of the ?? phase to a melting point Tm, and performing an air cooling to form a billet having an average crystal grain size of #1 or more,
an overaging thermal treatment step of heating and holding the billet at a temperature range of from Ts to Ts+50° C. and then slowly cooling it to a temperature Ts? that is Ts or lower so that ??-phase grains are allowed to precipitate and grow and to increase an average interval thereof, and
a crystal grain fining forging step of performing another forging at a temperature range of from Ts?150° C. to Ts and performing another air cooling,
wherein Ts is from 1,030° C. to 1,100° C., and
wherein crystal growth is suppressed by the ??-phase grains resulting from the overaging thermal treatment to result in an overall average crystal grain size of #8 or more after the crystal grain fining forging step.
US Pat. No. 10,337,079

MARAGING STEEL

DAIDO STEEL CO., LTD., N...

1. A maraging steel consisting of:as essential components,
0.20 mass %?C5.1?0.35 mass %,
9.0 mass %?Co?20.0 mass %,
1.0 mass %?(Mo+W/2)?2.0 mass %,
1.0 mass %?Cr?4.0 mass %, and
a certain amount of Ni, and
as optional components,
Al?0.10 mass %,
Ti?0.10 mass %,
S?0.0010 mass %,
N?0.0020 mass %,
V+Nb?0.60 mass %,
B?0.0050 mass %, and
Si?1.0 mass %,
with a balance being Fe and inevitable impurities,
wherein, in a case where contents of V and Nb satisfy V+Nb?0.020 mass %, an amount of Ni is:
6.0 mass %?Ni?9.4 mass %, and
wherein, in a case where the contents of V and Nb satisfy0.020 mass %

US Pat. No. 10,344,345

PART OBTAINED FROM AGE HARDENING TYPE BAINITIC MICROALLOYED STEEL, PROCESS FOR PRODUCING PART, AND AGE HARDENING TYPE BAINITIC MICROALLOYED STEEL

DAIDO STEEL CO., LTD., A...

1. A process for producing a part from an age hardening type bainitic microalloyed steel, the age hardening type bainitic microalloyed steel comprising, in terms of mass %:0.10-0.40% of C;
0.01-2.00% of Si;
0.10-3.00% of Mn;
0.001-0.150% of P;
0.001-0.200% of S;
0.001-2.00% of Cu;
up to 0.40% of Ni;
0.10-3.00% of Cr; and
at least one selected from:
0.02-2.00% of Mo;
0.02-2.00% of V;
0.001-0.250% of Ti; and
0.010-0.100% of Nb,
with the remainder being Fe and unavoidable impurities, and satisfying the following expression (1) and expression (2),
the process comprising:
a non-thermal-refining forging step of subjecting the age hardening type bainitic microalloyed steel to hot forging;
an age hardening treatment step of subjecting the age hardening type bainitic microalloyed steel after the hot forging to age hardening treatment at a predetermined aging temperature within a range of 500-700° C.; and
a strain age hardening treatment step of subjecting the age hardening type bainitic microalloyed steel during or after the age hardening treatment to strain age hardening treatment at a predetermined working temperature that is lower than the aging temperature and is within a range of 200-600° C. and at a reduction ratio of 3-35%:
3×[C]+10×[Mn]+2×[Cu]+2×[Ni]+12×[Cr]+9×[Mo]+2×[V]>20  expression (1);
32×[C]+3×[Si]+3×[Mn]+2×[Ni]+3×[Cr]+11×[Mo]+32×[V]+65×[Ti]+36×[Nb]>24.0   expression (2),
in which each [ ] in the expression (1) and the expression (2) indicates a content of the element shown therein in terms of mass %.

US Pat. No. 10,475,561

RFEB SYSTEM MAGNET PRODUCTION METHOD, RFEB SYSTEM MAGNET, AND COATING MATERIAL FOR GRAIN BOUNDARY DIFFUSION TREATMENT

INTERMETALLICS CO., LTD.,...

1. An RFeB system magnet production method for producing an RL2Fe14B system magnet which is a sintered magnet or a hot-deformed magnet containing, as a main rare-earth element, a light rare-earth element RL which is at least one of two elements of Nd and Pr, the method comprising steps of:applying, to a surface of a base material of the RL2Fe14B system magnet, a coating material prepared by mixing a silicone grease and an RH-containing powder containing a heavy rare-earth element RH composed of at least one element selected from a group of Dy, Tb and Ho; and
heating the base material together with the coating material, wherein: the RFeB system magnet has a thickness of 5.5 mm or less; Tb content at a position in the RFeB system magnet is higher as the position is closer to a surface of the RFeB system magnet; and a difference between the maximum and the minimum in a coercivity at positions in the RFeB system magnet is 1 kOe or less.
US Pat. No. 10,428,414

CARBURIZED COMPONENT

DAIDO STEEL CO., LTD., A...

1. A carburized part having a total amount of TiC, AlN and ZrC, which are precipitate particles, of 4.5×10?1° mole or less per 1 mm2 of grain boundary area of prior austenite grains after carburization, which is formed by processing a steel material into a shape of a part and performing a carburizing treatment on the steel material, the steel material having a composition consisting of, in terms of % by mass:0.10% to 0.30% of C;
0.01% to 0.49% of Si;
0.65% to 1.50% of Mn;
0.01% to 0.10% of S;
0.03% or less of P;
0.05% to 1.00% of Cu;
0.05% to 1.00% of Ni;
0.01% to 2.00% of Cr;
0.01% to 0.50% of Mo;
0.001% or less of Nb;
0.005% to 0.050% of s-Al;
0.005% to 0.030% of N; and
one or two elements selected from
0.001% to 0.150% of Ti and
0.001% to 0.300% of Zr,
and optionally:
0.001% to 0.010% of B,
with the remainder being Fe and inevitable impurities,
wherein
[Ti], [Zr] and [N] which respectively represent contents of Ti, Zr, and N, in mole/g, satisfy the following equation (1):
|[Ti]/47.9+[Zr]/91.2?[N]/14|/100?3.5×10?6 mole/g  Equation (1);
wherein at least one element selected from Ti and Zr combines with N included in the steel at the time of forging of the steel, and crystallizes in a form of at least one of TiN and ZrN having no contribution to a pinning of crystal grain boundaries to prevent AlN having a pinning action from being precipitated, and
a structure thereof after the carburization is a well-ordered grain structure having a uniform crystal grain size in which an average crystal grain size of the prior austenite grain is greater than 3 and 7.5 or less, and a crystal grain size difference of the prior austenite grains is 6 or less.
US Pat. No. 10,301,695

MARAGING STEEL

DAIDO STEEL CO., LTD., N...

1. A maraging steel consisting of:as essential components,
0.20 mass %?C5.1?0.35 mass %,
9.0 mass %?Co?20.0 mass %,
1.0 mass %?(Mo+W/2)?2.0 mass %,
1.0 mass %?Cr?4.0 mass %, and
a certain amount of Ni, and
as optional components,
Al?0.10 mass %,
Ti?0.10 mass %,
S?0.0010 mass %,
N?0.0020 mass %,
V+Nb?0.60 mass %,
B?0.0050 mass %, and
Si?1.0 mass %,
with a balance being Fe and inevitable impurities,
wherein, in a case where contents of V and Nb satisfy V+Nb?0.020 mass %, an amount of Ni is:
6.0 mass %?Ni?9.4 mass %, and
wherein, in a case where the contents of V and Nb satisfy0.020 mass %

US Pat. No. 10,557,388

ENGINE EXHAUST VALVE FOR LARGE SHIP AND METHOD FOR MANUFACTURING THE SAME

DAIDO STEEL CO., LTD., N...

1. A method for manufacturing an exhaust valve of a diesel engine for a ship, the exhaust valve comprising a shaft part and an umbrella part that are integrated with each other and include an Ni—Cr—Al system Ni-base age-precipitated alloy, wherein the method comprises:vacuum melting a raw material to obtain a steel ingot;
obtaining a billet for a forge working from the steel ingot;
subjecting the billet to an aging heat treatment to form an overaged state so as to give a layered structure containing a layer including an ?-Cr phase having a thickness of 150 nm or more;
forge-working the billet in an integrated state of the shaft part and the umbrella part; and
an adjusting heat treatment to provide a hardness of 600 HV or less as a whole while maintaining the thickness of the layer formed of the ?-Cr phase,
wherein the vacuum melting, the obtaining the billet, and the aging heat treatment are conducted while maintaining a temperature to at least 600° C. or higher, and
wherein the alloy includes a component composition comprising, in mass %:
essential elements of:
Cr: 32% to 50%,
Al: 0.5% to 10.0%; and
Fe: 0.1% to 20.0%;
optional elements of:
Si: 5% or less;
B: 0.01% or less;
C: 0.1% or less;
Cu: 5% or less;
Ti: 0.1% or less;
Nb: 0.1% or less;
Ta: 0.1% or less; and
V: 0.1% or less,
with a proviso that Ti+Nb+Ta+V is 0.1% or less; and
a balance being unavoidable impurities and Ni.

US Pat. No. 10,427,200

MOLD FIXING STRUCTURE

DAIDO STEEL CO., LTD., N...

1. A method of fixing a mold to a mold mounting surface, the method comprising:sliding the mold onto a mold supporting body comprising:
a shaft protruding from the mold mounting surface;
a flange formed on the shaft; and
a bearing formed on the shaft on a side of the flange that is opposite the mold mounting surface and supporting the mold, the mold being slid onto the mold supporting body so as to insert the flange and bearing into a groove in the mold; and
reducing a distance by which the shaft protrudes from the mold mounting surface so that the flange forces a wall surface of the groove in a direction toward the mold mounting surface.

US Pat. No. 10,658,095

SM-FE-N MAGNET MATERIAL AND SM-FE-N BONDED MAGNET

DAIDO STEEL CO., LTD., N...

1. An Sm—Fe—N magnet material, comprising:7.0-12 at % of Sm;
0.1-1.5 at % of at least one element selected from the group consisting of Hf, Zr, and Sc;
0.1-0.5 at % of Mn;
10-20 at % of N,
0-35 at % of Co; and
0.1-0.5 at % of Si,
with a remainder being Fe and unavoidable impurities.

US Pat. No. 10,603,711

METHOD FOR MANUFACTURING ALLOY INGOT

DAIDO STEEL CO., LTD., N...

1. A method for manufacturing a round-rod shaped alloy ingot by hot forging, comprising:suspending a primary alloy ingot having a round-rod shape in a columnar mold while one end of the primary alloy ingot is held;
pouring a molten metal formed of a heat-retaining metal into the columnar mold so as to apply a coating of the heat-retaining metal to the entire circumference of the primary alloy ingot, to obtain a forging alloy ingot, the coating comprising an excess thickness at an end portion of the primary alloy ingot opposite the one end;
taking the forging alloy ingot out from the columnar mold;
subjecting the forging alloy ingot to a one-way hot forging while gripping the excess thickness at the end portion of the forging alloy ingot as a gripping portion; and
removing the coating of the heat-retaining metal.

US Pat. No. 10,576,530

HOLDING MECHANISM

DAIDO STEEL CO., LTD., N...

1. A holding mechanism, comprising:a pair of holding claws that are disposed to be opposed to each other on both sides of a workpiece in a horizontal direction, a holding face of one of the holding claws being formed into a flat face, a holding face of another holding claw being formed into a V-shaped groove;
a driving unit that moves an output shaft forward and backward in a vertical direction; and
a link mechanism that converts a forward/backward motion of the output shaft into an opening/closing motion in the horizontal direction and transmits the opening/closing motion to the pair of holding claws,
wherein, when the pair of holding claws are moved to be opened/closed in the horizontal direction, the holding claw having the V-shaped groove is moved more than the holding claw having the flat face,
wherein the link mechanism comprises:
a pair of tilting links extending in opposite directions to each other, first ends of the tilting links being rotatably connect d to each other, and second ends of the tilting links respectively being connected to the pair of holding claws; and
a connection pin connecting the first ends of the tilting links, and
wherein, when the holding claws are moved in a closing direction, the connection pin moves in an inclination direction inclined from the vertical direction.
US Pat. No. 10,526,689

HEAT-RESISTANT TI ALLOY AND PROCESS FOR PRODUCING THE SAME

DAIDO STEEL CO., LTD., N...

5. A process for producing a heat-resistant Ti alloy having a composite structure having an equiaxed ? phase and ? grains containing an acicular ? phase inside thereof, the process comprising:a step of preparing a bulk alloy having a composition consisting of, in terms of % by mass:
5.0-7.0% of Al;
3.0-5.0% of Sn;
2.5-6.0% of Zr;
2.0-4.0% of Mo;
0.05-0.80% of Si;
0.001-0.200% of C;
0.05-0.20% of O; and
0.3-2.0% in total of at least one kind selected from the group consisting of Nb and Ta;
with the balance being Ti and unavoidable impurities,
a first heat treatment step in which the alloy is heated and held at a temperature that is within a ?-single-phase temperature region and is higher than a ? transformation point T?,
an adjustment forging step in which the alloy is hot-forged at a temperature that is within an (?+?)-two-phase temperature region and is lower than the ? transformation point T?, thereby adjusting an equiaxed ? phase,
a second heat treatment step in which the alloy is heated and held at a temperature that is within the (?+?)-two-phase temperature region and is higher than the temperature in the adjustment forging step, followed by cooling to precipitate an acicular ? phase, and
an aging heat treatment step which is performed at 570-650° C.,
wherein, prior to the first heat treatment step, the alloy is subjected to a pre-forging step in which the alloy is hot-forged in the ?-single-phase temperature region and further hot-forged in the (?+?)-two-phase temperature region, whereby the acicular ? phase is formed in the ?-grains, and the equiaxed ? phase has an average grain diameter of 5 ?m to 20 ?m and an average aspect ratio of 5.0 or less and is contained in an amount of 5-35% in terms of sectional areal proportion to the composite structure.
US Pat. No. 10,472,701

NI-BASED SUPERALLOY FOR HOT FORGING

DAIDO STEEL CO., LTD., N...

1. A Ni-based superalloy for hot forging, having a component composition consisting of, in terms of % by mass:C: more than 0.001% and less than 0.100%;
Cr: 11% or more and less than 19%;
Co: more than 5% and less than 25%;
Fe: 0.1% or more and less than 4.0%;
Mo: more than 2.0% and less than 5.0%;
W: more than 1.0% and less than 5.0%;
Nb: 1.9% or more and less than 4.0%;
Al: more than 3.0% and less than 5.0%;
Ti: more than 1.0% and less than 3.4%; and
Ta: 0.01% or more and less than 2.0%,
with a balance being unavoidable impurities and Ni,
wherein, when a content of an element M in terms of atomic % is represented by [M], the component composition satisfies following two relationships:
4.5?([Ti]+[Nb]+[Ta])/[Al]×10<6.5; and
10.5?[Al]+[Ti]+[Nb]+[Ta]<13.0, and
wherein the Ni-based superalloy has a 0.2% yield strength at 730° C. of 970 MPa or more, and a tensile strength at 730° C. of 1,110 MPa or more.
US Pat. No. 10,385,426

NI-BASED SUPERALLOY

DAIDO STEEL CO., LTD., N...

1. A turbine wheel, comprising:a Ni-based superalloy having a composition comprising, in terms of % by mass:
C: from 0.1% to 0.3%;
Cr: from 8.0% to 12.0%;
Mo: from 1.0% to 5.0%;
Co: from 10.0% to 20.0%;
Ta: from 0.01% to 1.50%;
Ti: from 2.0% to 4.2%;
Al: from 5.0% to 8.0%;
V: from 0% to 1.5%;
B: from 0.005% to 0.030%; and
Zr: from 0.05% to 0.15%,
with a balance being Ni and unavoidable impurities, and
satisfying, in terms of atom %:
Ti+Al being from 16.0% to 20.3%; and
Ti/Al being 0.3 or less.

US Pat. No. 10,378,072

MARAGING STEEL

DAIDO STEEL CO., LTD., N...

1. A maraging steel consisting of:as essential components,
0.10 mass %?C?0.35 mass %,
9.0 mass %?Co?20.0 mass %,
1.0 mass %?(Mo+W/2)?2.0 mass %,
1.0 mass %?Cr?2.6 mass %,
6.0 mass %?Ni?20.0 mass %,
0.50 mass %?Al?2.0 mass %, and
0.020 mass % as optional components,
Ti?0.10 mass %,
S?0.0010 mass %,
N?0,0020 mass %,
B?0.0050 mass %, and
Si?1.0 mass %,
with a balance being Fe and inevitable impurities,
wherein a number of AlN inclusion having a minor axe of 1.0 ?m or smaller and an aspect ratio of 10 or larger is 0 per 100 mm2 when observed under Scanning Electron Microscope (SEM), and
wherein a following relational expression is satisfied:
Parameter X?13.2,
wherein X=5.5[C]+11.6[Si]?1.4[Ni]?5[Cr]?1.2[Mo]+0.7[Co]+41.9[Al]?7[V]?98.4[Nb]+3.3[B], and
each element symbol with braces represents a content (by mass %) of each element.
US Pat. No. 10,689,721

CASE HARDENING STEEL AND CARBURIZED COMPONENT OBTAINED THEREFROM

DAIDO STEEL CO., LTD., A...

1. A carburized part obtained by working a case hardening steel into a shape of a part by cold forging, followed by subjecting to carburizing and quenching, the case hardening steel satisfying the following Expression (1) representing a maximum deformation resistance ?MAX in MPa and a DI value, the maximum deformation resistance ?MAX in MPa being obtained when a test piece which has a size of ? 15×22.5 mm and is cut out from a material after spheroidizing, is subjected to compressive deformation by cold forging at a compression ratio of 70% in a state that an end surface thereof is restrained, and the DI value being obtained from a Jominy quenching test:?MAX<12.8×DI+745  Expression (1),wherein a total amount of TiC, AlN and ZrC, which are precipitate particles, is 4.5×10?10 moles or less per 1 mm2 of grain boundary area of prior austenite grains after the carburizing and quenching, and the case hardening steel having a composition consisting essentially of, in terms of % by mass:0.10% to 0.30% of C;
0.01% to 1.50% of Si;
0.40% to 1.50% of Mn;
0.01% to 0.10% of S;
0.03% or less of P;
0.05% to 1.00% of Cu;
0.05% to 1.00% of Ni;
0.01% to 1.39% of Cr;
0.01% to 0.50% of Mo;
0.001% or less of Nb;
0.005% to 0.050% of s-Al;
0.005% to 0.030% of N;
0.001% to 0.150% of Ti; and
0.000% to 0.300% of Zr,
and optionally: 0.001% to 0.010% of B,
with the remainder being Fe and inevitable impurities,
wherein [Ti], [Zr] and [N] which respectively represent contents of Ti, Zr and N satisfy the following Expression (2):
|[Ti]/47.9+[Zr]/91.2+[N]/14|/100?3.5×10?6 mol/g  Expression (2),
wherein, in a structure thereof after the carburizing and quenching, an average crystal grain size number of the prior austenite grains is No. 5.9 or less.
US Pat. No. 10,689,723

FERRITIC STAINLESS STEEL AND HEAT-RESISTANT MEMBER

DAIDO STEEL CO., LTD., N...

1. A ferritic stainless steel, consisting of, in mass %:0.001%?C?0.020%,
0.05%?Si?0.50%,
0.1%?Mn?1.0%,
15.0%?Cr?25.0%,
Mo<0.50%,
1.4%?W?2.5%, and
0.01%?Nb?0.40%, and
at least one member selected from the group consisting of:
Ni?2.0%,
Ti?0.50%,
Ta?0.50%,
B?0.0080%,
Mg?0.0100%, and
Ca?0.0100%,
with a balance being Fe and unavoidable impurities,
having a content of coarse Laves phase having a diameter of 0.50 ?m or more being 0.1% or less,
having an average grain size being 30 ?m or more and 200 ?m or less, and
having a solid-solution temperature of a Laves phase of 950° C. or less.