公开(公告)号：US20170018344A1

公开(公告)日：2017-01-19

申请号：US15301078

申请日：2015-03-27

Applicant: JFE STEEL CORPORATION

Inventor： Takuya Takashita ,  Naomichi Nakamura

IPC: H01F1/20 ,  B22F1/00 ,  C22C38/18 ,  H02K1/02 ,  C22C38/06 ,  C22C38/02 ,  H01F1/147 ,  H01F41/02 ,  B22F1/02 ,  C22C38/04

CPC classification number: H01F1/20 ,  B22F1/0014 ,  B22F1/02 ,  C22C33/0264 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  H01F1/14791 ,  H01F1/26 ,  H01F41/0246 ,  H02K1/02

Abstract: Provided is an iron powder for iron powder cores, and a method for selecting the same. The following powder is an iron powder in which orientations are measured in a cross section of a compact formed with a molding pressure of 0.98 GN/m2 by electron backscatter diffraction (EBSD) and the average of KAMs calculated using EBSD analysis software is to 3.00° or less. The Iron powder has a particle size distribution in which particles with a size of 45 μm or less are adjusted to 10% by mass or less, in which the average hardness of powder particles is 80 HV 0.025 or less in Vickers hardness, in which the product of the number (inclusions/m2) of inclusions per unit area and the median size D50 (m) of the inclusions is 10,000 (inclusions/m) or less, and which has an apparent density of 4.0 Mg/m3 or more.

Abstract translation: 提供了铁粉芯的铁粉及其选择方法。 以下的粉末是铁粉末，其中通过电子反向散射衍射（EBSD）以0.98NN / m 2的成型压力形成的压块的截面中测量取向，并且使用EBSD分析软件计算的KAM的平均值为3.00° 或更少。 铁粉末的粒径分布为45μm以下的粒子的粒径分布为10质量％以下，维氏硬度的粉末粒子的平均硬度为80HV 0.025以下，其中， 每单位面积的夹杂物的数量（夹杂物/ m2）和夹杂物的中值粒径D50（m）的乘积为10000（夹杂物/ m）以下，表观密度为4.0Mg / m 3以上。

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：US12030122B2

公开(公告)日：2024-07-09

申请号：US17075693

申请日：2020-10-21

Applicant: JFE STEEL CORPORATION ,  TOKIN CORPORATION ,  National Institute of Advanced Industrial Science and Technology

Inventor： Naomichi Nakamura ,  Makoto Nakaseko ,  Takuya Takashita ,  Mineo Muraki ,  Hoshiaki Terao ,  Raita Wada ,  Akiri Urata ,  Yu Kanamori ,  Makoto Yamaki ,  Koichi Okamoto ,  Toshinori Tsuda ,  Shoichi Sato ,  Kimihiro Ozaki

IPC: B22F3/14 ,  B22F1/00 ,  B22F1/02 ,  B22F1/08 ,  B22F1/102 ,  B22F1/16 ,  B22F3/00 ,  B22F3/02 ,  B22F3/03 ,  C22C33/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/16 ,  C22C45/02 ,  H01F1/153 ,  H01F3/08 ,  H01F41/02 ,  H01F27/255

CPC classification number: B22F3/14 ,  B22F1/00 ,  B22F1/08 ,  B22F1/102 ,  B22F1/16 ,  B22F3/00 ,  B22F3/02 ,  B22F3/03 ,  C22C33/02 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/16 ,  C22C45/02 ,  H01F1/15308 ,  H01F1/15325 ,  H01F1/15333 ,  H01F1/15375 ,  H01F3/08 ,  H01F41/0246 ,  B22F2301/35 ,  B22F2304/10 ,  C22C2200/02 ,  C22C2200/04 ,  C22C2202/02 ,  H01F27/255

Abstract: Provided is a method of manufacturing a soft magnetic dust core. The method includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature Tx1 and a second initial crystallization temperature Tx2; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than Tx1−100 K; and heating to a maximum end-point temperature equal to or higher than Tx1−50 K and lower than Tx2 with the compacting pressure being applied.

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.

公开(公告)号：US10010935B2

公开(公告)日：2018-07-03

申请号：US14442217

申请日：2013-12-02

Applicant: JFE STEEL CORPORATION

Inventor： Takuya Takashita ,  Naomichi Nakamura

IPC: B22F1/00 ,  C22C38/00 ,  H01F1/20 ,  H01F3/08 ,  B22F9/08 ,  B22F9/20 ,  C21D1/26 ,  C21D3/02 ,  C21D3/04 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C33/02

CPC classification number: B22F1/0062 ,  B22F1/0014 ,  B22F9/082 ,  B22F9/20 ,  B22F2009/0828 ,  B22F2301/35 ,  B22F2304/10 ,  B22F2998/10 ,  C21D1/26 ,  C21D3/02 ,  C21D3/04 ,  C22C33/02 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C2202/02 ,  H01F1/20 ,  H01F3/08

Abstract: The present invention provides iron powder for dust cores that has excellent compressibility and low iron loss after formation. In the iron powder for dust cores, Si content is 0.01 mass % or less, apparent density is 3.8 g/cm3 or more, the ratio of iron powder particles with a particle size of 45 μm or less is 10 mass % or less, the ratio of iron powder particles with a particle size of over 180 μm and 250 μm or less is less than 30 mass %, the ratio of iron powder particles with a particle size of over 250 μm is 10 mass % or less, and the Vickers hardness (test force: 0.245 N) of a powder cross-section is 80 Hv or less.

公开(公告)号：US11814707B2

公开(公告)日：2023-11-14

申请号：US16481449

申请日：2018-01-26

Applicant: TOKIN CORPORATION ,  JFE STEEL CORPORATION

Inventor： Akiri Urata ,  Miho Chiba ,  Mineo Muraki ,  Makoto Nakaseko ,  Takuya Takashita

IPC: C22C38/00 ,  C22C33/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  C22C38/16 ,  C22C45/02 ,  H01F1/147 ,  B22F1/08 ,  H01F1/153

CPC classification number: C22C38/005 ,  B22F1/08 ,  C22C33/0257 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  C22C38/16 ,  C22C45/02 ,  H01F1/14791 ,  C22C2200/02 ,  C22C2200/04 ,  C22C2202/02 ,  H01F1/15333 ,  B22F2998/10 ,  B22F9/082 ,  B22F1/08 ,  B22F2003/248 ,  B22F1/148 ,  B22F3/02

Abstract: This soft magnetic powder is represented by composition formula FeaSibBcPdCue with the exception of unavoidable impurities. In the composition formula, a, b, c, d and e satisfy 79≤a≤84.5 at %, 0≤b

公开(公告)号：US11654487B2

公开(公告)日：2023-05-23

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 ,  C22C33/02 ,  C22C45/02 ,  H01F1/153 ,  B22F1/05

CPC classification number: B22F9/082 ,  B22F1/05 ,  C22C33/0278 ,  C22C45/02 ,  H01F1/153 ,  B22F2009/0828 ,  B22F2301/35 ,  B22F2304/10 ,  C22C2200/02 ,  C22C2202/02

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：US11600414B2

公开(公告)日：2023-03-07

申请号：US17262204

申请日：2019-07-25

Applicant: JFE STEEL CORPORATION

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

IPC: H01F1/22 ,  C22C45/02 ,  H01F1/153 ,  B22F9/24 ,  B22F9/00 ,  H01F3/08 ,  H01F27/255 ,  B22F1/07

Abstract: Provided is a soft magnetic powder that can produce a dust core having excellent magnetic properties. The soft magnetic powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeaSibBcPdCueMf, where the M 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