公开(公告)号：US12187976B2

公开(公告)日：2025-01-07

申请号：US17594561

申请日：2020-01-28

Applicant: JFE STEEL CORPORATION

Inventor： Hanako Shimamoto ,  Ryosuke Matsuoka ,  Kohsuke Ashizuka ,  Shigeru Unami

IPC: B22F1/10 ,  B22F1/00 ,  B22F1/08 ,  B22F1/102 ,  B22F1/105 ,  B22F1/16 ,  B22F1/17 ,  C10M115/04 ,  C10M115/08 ,  C10M169/04 ,  C10N40/20

Abstract: A mixed powder for powder metallurgy comprises: an iron-based powder; and a lubricant, wherein the lubricant consists of a low-melting-point lubricant having a melting point of 86° C. or less and a high-melting-point lubricant having a melting point of more than 86° C., the low-melting-point lubricant has at least one of an amide group, an ester group, an amino group, and a carboxyl group, a ratio R1 of the low-melting-point lubricant to whole of the lubricant is 5 mass % or more and less than 90 mass %, a ratio R2 of a mass of a free lubricant to a mass of a binding lubricant is 0 or more and 15 or less, and an amount R3 of the low-melting-point lubricant contained as the free lubricant is less than 0.10 parts by mass with respect to 100 parts by mass of the iron-based powder.

公开(公告)号：US11224914B2

公开(公告)日：2022-01-18

申请号：US16613122

申请日：2018-06-12

Applicant: JFE STEEL CORPORATION

Inventor： Shigeru Unami ,  Masato Oya

IPC: C08K3/11 ,  B22F1/00 ,  C08K3/04 ,  C22C33/02

Abstract: The powder mixture for powder metallurgy includes a raw material powder, a binder, and a graphite powder, where the raw material powder contains an iron-based powder in a content of 90 mass % or more of the raw material powder, the graphite powder has an average particle size of less than 5 μm, a ratio in mass of the binder to the sum the raw material powder and the graphite powder is 0.10 mass % to 0.80 mass %, a ratio of mass of the graphite powder to the sum of mass of the raw material powder and mass of the graphite powder is 0.6 mass % to 1.0 mass %, surface of the raw material powder is covered with at least a part of the binder, and surface of the binder covering the surface of the raw material powder is covered with at least a part of the graphite powder.

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：US10265766B2

公开(公告)日：2019-04-23

申请号：US14787882

申请日：2014-04-25

Applicant: JFE STEEL CORPORATION

Inventor： Toshio Maetani ,  Shigeru Unami

IPC: B22F1/00 ,  B22F1/02 ,  C21D6/00 ,  C22C38/00 ,  C22C33/02 ,  C22C38/16 ,  C22C38/12 ,  B22F3/16 ,  B22F9/04

Abstract: Provided is an alloy steel powder for powder metallurgy containing an iron-based powder as a main component that is capable of achieving both high strength and high toughness in a sintered body using the same. In the alloy steel powder, the iron-based powder contains a reduced powder, and Mo content with respect to a total amount of the alloy steel powder is 0.2 mass % to 1.5 mass %, Cu powder content with respect to a total amount of the alloy steel powder is 0.5 mass % to 4.0 mass % and graphite powder content with respect to a total amount of the alloy steel powder is 0.1 mass % to 1.0 mass %.

公开(公告)号：US20160214171A1

公开(公告)日：2016-07-28

申请号：US15024628

申请日：2014-08-26

Applicant: JFE STEEL CORPORATION

Inventor： Toshio Maetani ,  Shigeru Unami ,  Tomoshige Ono ,  Yukiko Ozaki

IPC: B22F1/00 ,  C22C38/00 ,  C22C38/16 ,  C22C38/12 ,  B22F9/02 ,  B22F3/16

CPC classification number: B22F1/0074 ,  B22F1/0011 ,  B22F3/16 ,  B22F9/02 ,  B22F2301/35 ,  B22F2304/10 ,  C22C33/0264 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16

Abstract: Provided is an alloy steel powder for powder metallurgy that is capable of achieving both high strength and high toughness in a sintered body using the same. An alloy steel powder for powder metallurgy of this disclosure comprises a composite alloy steel powder and graphite powder. The composite alloy steel powder has a specific surface area of 0.100 m2/g or more and Mo content in a range of 0.2 mass % to 1.5 mass %, and the graphite powder content with respect to 100 mass % of the alloy steel powder for powder metallurgy is in a range of 0.1 mass % to 1.0 mass %.

Abstract translation: 本发明提供一种粉末冶金用合金钢粉末，其能够在使用其的烧结体中实现高强度和高韧性。 本公开的用于粉末冶金的合金钢粉末包括复合合金钢粉末和石墨粉末。 复合合金钢粉末的比表面积为0.100m 2 / g以上，Mo含量在0.2质量％〜1.5质量％的范围内，石墨粉末含量相对于粉末合金钢粉末的100质量％ 冶金在0.1质量％至1.0质量％的范围内。

公开(公告)号：US11643710B2

公开(公告)日：2023-05-09

申请号：US16965299

申请日：2018-12-12

Applicant: JFE STEEL CORPORATION

Inventor： Hanako Shimamoto ,  Shigeru Unami

IPC: B22F1/02 ,  C10M105/60 ,  C22C33/02 ,  B22F1/16 ,  B22F1/103 ,  B22F1/102

CPC classification number: C22C33/02 ,  B22F1/102 ,  B22F1/103 ,  B22F1/16 ,  C10M105/60 ,  B22F2301/35 ,  B22F2302/40

Abstract: Provided is a mixed powder for powder metallurgy that contains a readily available compound as a lubricant, does not need to contain a stain-causing metal soap, has excellent ejection properties, and can exhibit excellent fluidity without deteriorating the ejection properties even in the case of further containing carbon black. The mixed powder for powder metallurgy contains (a) an iron-based powder and (b) a lubricant, where the lubricant (b) contains a specific aliphatic amine.

公开(公告)号：US11351603B2

公开(公告)日：2022-06-07

申请号：US17271204

申请日：2019-09-20

Applicant: JFE STEEL CORPORATION

Inventor： Hanako Shimamoto ,  Shigeru Unami

IPC: C10M105/38 ,  B22F1/00 ,  B22F1/10 ,  B22F1/05 ,  B22F3/02 ,  C10M129/74 ,  C10M169/04 ,  C10N40/20

Abstract: Provided is a mixed powder for powder metallurgy that contains a readily available compound as a lubricant, does not need to contain a stain-causing metal soap, has excellent ejection properties and compressibility, and can exhibit excellent fluidity without deteriorating the ejection properties or the compressibility even in the case of further containing carbon black. The mixed powder for powder metallurgy comprising an (a) iron-based powder and a (b) lubricant, wherein the (b) lubricant is an ester of disaccharide and fatty acid represented by R—COOH, and the R is an alkyl group having 11 or more carbon atoms or an alkenyl group having 11 or more carbon atoms.

公开(公告)号：US10596625B2

公开(公告)日：2020-03-24

申请号：US16067136

申请日：2016-11-25

Applicant: JFE STEEL CORPORATION

Inventor： Shigeru Unami ,  Juuji Hirayama

IPC: B22F1/00 ,  B22F1/02 ,  C10M103/02 ,  C10M107/44 ,  C10M111/04 ,  C22C38/00 ,  C10M169/04 ,  B22F3/02 ,  C22C33/02 ,  B22F9/08

Abstract: A mixed powder for powder metallurgy having excellent green compact strength and ejectability is provided. The mixed powder for powder metallurgy includes an iron-based powder; and a copolymerized polyamide, in an amount of 0.3 to 2.0 parts by mass per 100 parts by mass of the iron-based powder, having a melting point of 80° C. to 116° C.

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：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.