公开(公告)号：US12006560B2

公开(公告)日：2024-06-11

申请号：US18174649

申请日：2023-02-27

Applicant: JFE STEEL CORPORATION

Inventor： Naoki Yamamoto ,  Takuya Takashita ,  Makoto Nakaseko ,  Akio Kobayashi ,  Akiri Urata ,  Miho Chiba

IPC: H01F1/22 ,  B22F1/00 ,  B22F1/052 ,  B22F1/07 ,  B22F1/08 ,  B22F9/00 ,  C22C38/02 ,  C22C45/02 ,  H01F1/153 ,  H01F3/08 ,  H01F27/255

CPC classification number: C22C38/02 ,  B22F1/052 ,  B22F1/07 ,  B22F1/08 ,  B22F9/002 ,  C22C45/02 ,  H01F1/15308 ,  H01F1/15333 ,  H01F1/22 ,  H01F3/08 ,  H01F27/255 ,  B22F2998/10 ,  C22C2200/02 ,  C22C2202/02 ,  B22F2998/10 ,  B22F9/002 ,  B22F1/08 ,  B22F1/10 ,  B22F3/02 ,  B22F2003/248

Abstract: Provided is an Fe-based nanocrystalline alloy powder. The Fe-based nanocrystalline alloy powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeaSibBcPdCueMf, where the M in the composition formula is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %≤a≤84.5 at %, 0 at %≤b

公开(公告)号：US11542579B2

公开(公告)日：2023-01-03

申请号：US16831307

申请日：2020-03-26

Applicant: HYUNDAI MOTOR COMPANY ,  KIA MOTORS CORPORATION ,  JFE STEEL CORPORATION

Inventor： Hak Soo Kim ,  Kohsuke Ashizuka ,  Akio Kobayashi ,  Naomichi Nakamura ,  Masashi Fujinaga ,  Toshio Maetani ,  Hirofumi Enokido ,  Hisashi Sudo

IPC: B22F1/00 ,  C22C38/16 ,  B22F1/10 ,  C22C38/12

Abstract: The present disclosure relates to an iron-based prealloy powder having excellent strength and processability, and an iron-based alloy powder for powder metallurgy and a sinter-forged member using the same. The iron-based prealloy powder for powder metallurgy according to an embodiment of the present disclosure includes 0.5 to 5.0 wt % of Cu, 0.1 to 0.5 wt % of Mo, and a balance of Fe and other inevitable impurities. A Cu content (Cu %) and a Mo content (Mo %) satisfy the following Relational Equation (1): 0.3×Cu %+3×Mo %≤2.7  (1).

公开(公告)号：US20210379658A1

公开(公告)日：2021-12-09

申请号：US17282448

申请日：2019-10-10

Applicant: JFE Steel Corporation

Inventor： Makoto Nakaseko ,  Shigeru Unami ,  Akio Kobayashi ,  Takuya Takashita

IPC: B22F9/08 ,  C22C45/02

Abstract: A production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream is higher than the melting point by 100° C. or more, spraying primary cooling water from a plurality of directions at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream of the primary cooling water from one direction and an impact direction on the molten metal stream of the primary cooling water from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature of metal powder is the melting point or higher and (the melting point+50° C.) or lower, spraying secondary cooling water on the metal powder under conditions of an impact pressure of 10 MPa or more.

公开(公告)号：US20210071286A1

公开(公告)日：2021-03-11

申请号：US16831307

申请日：2020-03-26

Applicant: HYUNDAI MOTOR COMPANY ,  KIA MOTORS CORPORATION ,  JFE STEEL CORPORATION

Inventor： Hak Soo KIM ,  Kohsuke Ashizuka ,  Akio Kobayashi ,  Naomichi Nakamura ,  Masashi Fujinaga ,  Toshio Maetani ,  Hirofumi Enokido ,  Hisashi Sudo

IPC: C22C38/16 ,  C22C38/12 ,  B22F1/00

Abstract: The present disclosure relates to an iron-based prealloy powder having excellent strength and processability, and an iron-based alloy powder for powder metallurgy and a sinter-forged member using the same. The iron-based prealloy powder for powder metallurgy according to an embodiment of the present disclosure includes 0.5 to 5.0 wt % of Cu, 0.1 to 0.5 wt % of Mo, and a balance of Fe and other inevitable impurities. A Cu content (Cu %) and a Mo content (Mo %) satisfy the following Relational Equation (1): 0.3×Cu %+3×Mo %≤2.7  (1).

公开(公告)号：US10207328B2

公开(公告)日：2019-02-19

申请号：US15529125

申请日：2015-11-24

Applicant: JFE STEEL CORPORATION

Inventor： Takuya Takashita ,  Akio Kobayashi ,  Naomichi Nakamura ,  Toshio Maetani ,  Akio Sonobe ,  Itsuya Sato

IPC: B22F7/00 ,  B22F1/00 ,  C22C38/12 ,  C22C38/16 ,  C22C33/02

Abstract: An Fe—Mo—Cu—C-based alloy steel powder for powder metallurgy has a chemical composition containing Mo: 0.2 mass % to 1.5 mass %, Cu: 0.5 mass % to 4.0 mass %, and C: 0.1 mass % to 1.0 mass %, with a balance being Fe and incidental impurities, wherein an iron-based powder has a mean particle size of 30 μm to 120 μm, and a Cu powder has a mean particle size of 25 μm or less. Despite the alloy steel powder for powder metallurgy having a chemical composition not containing Ni, a part produced by sintering a press formed part of the powder and further carburizing-quenching-tempering the sintered part has mechanical properties of at least as high tensile strength, toughness, and sintered density as a Ni-added part.

公开(公告)号：US11236411B2

公开(公告)日：2022-02-01

申请号：US16979170

申请日：2019-03-22

Applicant: JFE STEEL CORPORATION

Inventor： Nao Nasu ,  Takuya Takashita ,  Akio Kobayashi

IPC: C22C33/02 ,  C22C38/12 ,  B22F3/10 ,  C22C38/16 ,  B22F1/00

Abstract: Disclosed is an alloyed steel powder for powder metallurgy from which sintered parts that do not contain expensive Ni, or Cr or Mn susceptible to oxidation, that have excellent compressibility, and that have high strength in an as-sintered state can be obtained. The alloyed steel powder for powder metallurgy has: a chemical composition containing Mo: 0.5 mass % to 2.0 mass % and Cu: 1.0 mass % to 8.0 mass %, with the balance being Fe and inevitable impurities; and a microstructure in which an FCC phase is present at a volume fraction of 0.5% to 10.0%.

公开(公告)号：US20210379657A1

公开(公告)日：2021-12-09

申请号：US17282444

申请日：2019-10-10

Applicant: JFE Steel Corporation

Inventor： Makoto Nakaseko ,  Naomichi Nakamura ,  Akio Kobayashi ,  Takuya Takashita

IPC: B22F9/08 ,  B22F1/00 ,  C22C45/02 ,  C22C33/02 ,  H01F1/153

Abstract: A production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream having an Fe concentration of 76.0 at % or more and less than 82.9 at % is 100° C. or more higher than the melting point, spraying primary cooling water at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream from one direction and an impact direction on the molten metal stream from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature of metal powder is the melting point or higher and (the melting point+100° C.) or lower, spraying secondary cooling water on the metal powder under conditions of an impact pressure of 10 MPa or more.

公开(公告)号：US12272491B2

公开(公告)日：2025-04-08

申请号：US17310961

申请日：2020-02-10

Applicant: JFE STEEL CORPORATION

Inventor： Naoki Yamamoto ,  Takuya Takashita ,  Makoto Nakaseko ,  Akio Kobayashi ,  Shigeru Unami

IPC: H01F3/08 ,  B22F1/00 ,  B22F1/052 ,  B22F1/065 ,  B22F1/16 ,  B22F3/00 ,  B22F3/02 ,  B22F3/24 ,  H01F1/26 ,  H01F27/255

Abstract: Provided is an iron-based powder for dust cores that has high apparent density and enables producing dust cores having high green density. An iron-based powder for dust cores comprises a maximum particle size of 1 mm or less, wherein a median circularity of particles constituting the iron-based powder for dust cores is 0.40 or more, and a uniformity number in Rosin-Rammler equation is 0.30 or more and 90.0 or less.

公开(公告)号：US12098449B2

公开(公告)日：2024-09-24

申请号：US16978767

申请日：2019-03-25

Applicant: JFE STEEL CORPORATION

Inventor： Takuya Takashita ,  Nao Nasu ,  Akio Kobayashi

IPC: C22C33/02 ,  B22F1/07 ,  C22C38/12 ,  C22C38/16 ,  B22F1/142

CPC classification number: C22C33/0257 ,  B22F1/07 ,  C22C33/02 ,  C22C38/12 ,  C22C38/16 ,  B22F1/142 ,  B22F2301/35 ,  B22F2302/40 ,  B22F2304/054 ,  B22F2998/10 ,  B22F2003/023 ,  C22C33/0278 ,  B22F1/108 ,  B22F2201/013 ,  B22F3/10 ,  B22F2998/10 ,  B22F9/082 ,  B22F1/142 ,  B22F2201/013

Abstract: Disclosed is an alloyed steel powder for powder metallurgy from which sintered parts that do not contain expensive Ni, or Cr or Mn susceptible to oxidation, that have excellent compressibility, and that have high strength in an as-sintered state can be obtained. The alloyed steel powder for powder metallurgy has: a chemical composition containing Cu: 1.0 mass % to 8.0 mass %, with the balance being Fe and inevitable impurities; and constituent particles in which Cu is present in an precipitated state with an average particle size of 10 nm or more.

公开(公告)号：US11795532B2

公开(公告)日：2023-10-24

申请号：US17282448

申请日：2019-10-10

Applicant: JFE Steel Corporation

Inventor： Makoto Nakaseko ,  Shigeru Unami ,  Akio Kobayashi ,  Takuya Takashita

IPC: B22F9/08 ,  C22C45/02 ,  B22F1/08 ,  B22F1/05

CPC classification number: C22C45/02 ,  B22F1/05 ,  B22F1/08 ,  B22F9/082 ,  B22F2009/088 ,  B22F2009/0828 ,  B22F2301/35

Abstract: A production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream is higher than the melting point by 100° C. or more, spraying primary cooling water from a plurality of directions at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream of the primary cooling water from one direction and an impact direction on the molten metal stream of the primary cooling water from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature of metal powder is the melting point or higher and (the melting point+50° C.) or lower, spraying secondary cooling water on the metal powder under conditions of an impact pressure of 10 MPa or more.