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：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：US12291765B2

公开(公告)日：2025-05-06

申请号：US17755826

申请日：2020-11-12

Applicant: JFE STEEL CORPORATION

Inventor： Kohsuke Ashizuka ,  Nao Nasu ,  Takuya Takashita ,  Shigeru Unami

IPC: C22C38/22 ,  B22F3/10 ,  C22C38/04 ,  C22C38/16 ,  C22C38/20

Abstract: Provided is an alloyed steel powder for powder metallurgy that has excellent compressibility and enables obtaining a sintered body having improved strength as sintered. An alloyed steel powder for powder metallurgy comprises: Cu: 2.0 mass % or more and 8.0 mass % or less; Mo: more than 0.50 mass % and 2.00 mass % or less; one or both of Mn: 0.1 mass % or more and 1.0 mass % or less and Cr: 0.3 mass % or more and 3.5 mass % or less; and a balance consisting of Fe and inevitable impurities, wherein the alloyed steel powder contains particulate oxide, and a total amount of Mn and Cr in the particulate oxide is 0.15 mass % or less with respect to 100 mass % of the alloyed steel powder, and a number ratio of particulate oxide in contact with Cu of FCC structure to the particulate oxide is 50% or more.

公开(公告)号：US11884996B2

公开(公告)日：2024-01-30

申请号：US17595648

申请日：2020-04-10

Applicant: JFE STEEL CORPORATION

Inventor： Nao Nasu ,  Takuya Takashita ,  Akio Kobayashi

IPC: C22C33/02 ,  B22F1/00 ,  C22C38/00 ,  C22C38/18 ,  B22F1/10 ,  C22C38/12 ,  C22C38/16 ,  B22F3/16 ,  C22C38/04

CPC classification number: C22C33/0257 ,  B22F1/00 ,  B22F1/09 ,  B22F1/10 ,  B22F3/16 ,  C22C38/001 ,  C22C38/04 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  B22F2301/10 ,  B22F2301/35 ,  B22F2302/40 ,  B22F2304/10 ,  B22F2998/10 ,  B22F1/10 ,  B22F3/02 ,  B22F3/1007 ,  B22F3/1028

Abstract: Provided is an iron-based alloy sintered body having a tensile strength of 800 MPa or more, excellent machinability, a microstructure with an average Vickers hardness of 300 Hv or more and 900 Hv or less and a standard deviation of Vickers hardness of 200 Hv or less, and an average pore circularity of 0.30 or more.