公开(公告)号：US11946119B2

公开(公告)日：2024-04-02

申请号：US17059210

申请日：2019-04-22

Applicant: JFE STEEL CORPORATION

Inventor： Masato Oya ,  Shigeru Unami

IPC: C08K3/04 ,  B22F1/05 ,  B22F1/052 ,  B22F1/10 ,  B22F1/102 ,  B22F1/103 ,  B22F1/16 ,  B22F1/17 ,  B22F3/08 ,  C08K3/08 ,  C22C33/02

CPC classification number: C22C33/0264 ,  B22F1/05 ,  B22F1/052 ,  B22F1/10 ,  B22F1/102 ,  B22F1/103 ,  B22F1/108 ,  B22F1/16 ,  B22F1/17 ,  C08K3/04 ,  C08K3/08 ,  B22F2301/10 ,  B22F2302/40 ,  B22F2302/45 ,  B22F2304/10 ,  C08K2003/085 ,  C08K2003/0856 ,  C08K2201/005

Abstract: Provided is a powder mixture for powder metallurgy that has excellent fluidity, can be ejected from a green compacting die with little force, and can suppress die galling in forming. The powder mixture comprises: a raw material powder; a copper powder; a binder; a graphite powder; and carbon black. The raw material powder contains an iron-based powder in an amount of 90 mass % or more with respect to the raw material powder. An average particle size of the graphite powder is less than 5 μm. Additive amounts of the binder, the graphite powder, the copper powder, and the carbon black are in specific ranges. A surface of the raw material powder is coated with at least part of the binder. A surface of the binder is coated with at least part of the graphite powder, at least part of the copper powder, and at least part of the carbon black.

公开(公告)号：US20240001441A1

公开(公告)日：2024-01-04

申请号：US18034773

申请日：2021-08-26

Applicant: JFE Steel Corporation

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

IPC: B22F9/08

CPC classification number: B22F9/082 ,  B22F2009/0872 ,  B22F2304/10

Abstract: A method for producing water-atomized metal powder by dividing a molten metal stream, which is falling in a vertical direction, by spraying cooling water that impinges on the molten metal stream includes a step of spraying the cooling water at a spray pressure of 10 MPa or more and a spread angle in a range of 5° to 30° from each of three or more cooling water discharge ports arranged remote from the falling molten metal stream. The droplet diameter of the cooling water: 100 μm or less, the convergence angle: 5° to 10°, and the water/molten steel ratio: 50 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.