公开(公告)号：SE542101C2

公开(公告)日：2020-02-25

申请号：SE1651389

申请日：2015-03-27

Applicant: JFE STEEL CORP

Inventor： NAKAMURA NAOMICHI ,  TAKASHITA TAKUYA

IPC: B22F1/00 ,  B22F1/02 ,  C22C38/00

Abstract: Provided is an iron powder for iron powder cores, the iron powder being capable of manufacturing an iron powder core having low iron loss and particularly low hysteresis loss.The following powder is suitable as a source powder for low-iron loss iron powder cores with an iron loss of less than 80 W/kg: an iron powder in which orientations are measured in a cross section of a compact formed with a molding pressure of 0.98 GN/mby 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 μιη 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/m) 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/mor more.

公开(公告)号：SE542048C2

公开(公告)日：2020-02-18

申请号：SE1750649

申请日：2015-11-24

Applicant: JFE STEEL CORP

Inventor： KOBAYASHI AKIO ,  SONOBE AKIO ,  SATO ITSUYA ,  NAKAMURA NAOMICHI ,  TAKASHITA TAKUYA ,  MAETANI TOSHIO

IPC: C22C33/02 ,  B22F1/00

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：CA3084963A1

公开(公告)日：2019-06-13

申请号：CA3084963

申请日：2018-12-05

Applicant: JFE STEEL CORP

Inventor： NAKASEKO MAKOTO ,  NAKAMURA NAOMICHI ,  KOBAYASHI AKIO ,  TAKASHITA TAKUYA

IPC: B22F9/08 ,  C22C38/00

Abstract: [Problem] To provide a method for producing an atomized metal powder with a high rate of amorphization by water atomization. [Solution] A method for producing an atomized metal powder with an amorphization rate of at least 90% by jetting high pressure water that collides with molten metal that is falling in the vertical direction to fragment the molten metal and form metal powder and cooling said metal powder, wherein: the collision pressure when the high pressure water collides with the molten metal is set to be at least 20 MPa; and the temperature of the molten metal and/or the temperature of the high pressure water is adjusted so that the high pressure water is in a subcritical state or a supercritical state at the surface of collision with the molten metal.

公开(公告)号：SE541269C2

公开(公告)日：2019-05-28

申请号：SE1850096

申请日：2016-09-16

Applicant: JFE STEEL CORP

Inventor： KOBAYASHI AKIO ,  SATO ITSUYA ,  NAKAMURA NAOMICHI ,  TAKASHITA TAKUYA

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

Abstract: Provided is a mixed powder for powder metallurgy having a chemical system not using Ni which causes non-uniform metallic microstructure in a sintered body. A mixed powder for powder metallurgy comprises: a partially diffusion alloyed steel powder in which Mo diffusionally adheres to a particle surface of an iron-based powder; a Cu powder; and a graphite powder, wherein the mixed 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 the balance consisting of Fe and inevitable impurities, and the partially diffusion alloyed steel powder has: a mean particle diameter of 30 pm to 120 pm; a specific surface area of less than 0.10 m /g; and a circularity of particles with a diameter in a range from 50 pm to 100 μm of 0.65 or less.

公开(公告)号：CA2990362A1

公开(公告)日：2017-02-09

申请号：CA2990362

申请日：2016-07-28

Applicant: AIST ,  JFE STEEL CORP ,  JFE PREC CORPORATION ,  TOKIN CORP

Inventor： NAKAMURA NAOMICHI ,  NAKASEKO MAKOTO ,  TAKASHITA TAKUYA ,  MURAKI MINEO ,  TERAO HOSHIAKI ,  WADA RAITA ,  URATA AKIRI ,  KANAMORI YU ,  YAMAKI MAKOTO ,  OKAMOTO KOICHI ,  TSUDA TOSHINORI ,  SATO SHOICHI ,  OZAKI KIMIHIRO

IPC: H01F41/02 ,  B22F1/00 ,  B22F1/02 ,  B22F3/00 ,  B22F3/02 ,  C22C38/00 ,  C22C45/02 ,  H01F1/153 ,  H01F1/22 ,  H01F27/255

Abstract: Provided is a soft magnetic dust core having high density and high characteristics. A method for producing a soft magnetic dust core, wherein: a coated powder, which contains an amorphous powder composed of an Fe-B-Si-P-C-Cu system alloy, an Fe-B-P-C-Cu system alloy, an Fe-B-Si-P-Cu system alloy or an Fe-B-P-Cu system alloy and having a first crystallization initiation temperature Tx1 and a second crystallization initiation temperature Tx2 and a coating formed on the surface of the amorphous powder, is prepared; and a molding pressure is applied to the coated powder at a temperature of Tx1 - 100 K or less, and the coated powder is heated to the maximum temperature that is Tx1 - 50 K or more but less than Tx2, while applying the molding pressure thereto.

公开(公告)号：SE538059C2

公开(公告)日：2016-02-23

申请号：SE1550819

申请日：2013-12-02

Applicant: JFE STEEL CORP

Inventor： TAKASHITA TAKUYA ,  NAKAMURA NAOMICHI

IPC: H01F1/22 ,  B22F1/00 ,  H01F1/24 ,  H01F27/24

公开(公告)号：CA2891206C

公开(公告)日：2016-02-09

申请号：CA2891206

申请日：2013-12-02

Applicant: JFE STEEL CORP

Inventor： TAKASHITA TAKUYA ,  NAKAMURA NAOMICHI

IPC: B22F1/00 ,  C22C38/00 ,  H01F1/14 ,  H01F1/20 ,  H01F27/24

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：SE1551330A1

公开(公告)日：2015-10-15

申请号：SE1551330

申请日：2014-04-08

Applicant: JFE STEEL CORP

Inventor： TAKASHITA TAKUYA ,  NAKAMURA NAOMICHI

IPC: B22F1/00 ,  B22F1/02 ,  C22C38/00 ,  H01F1/24 ,  H01F27/255

公开(公告)号：JP2014210966A

公开(公告)日：2014-11-13

申请号：JP2013088720

申请日：2013-04-19

Applicant: Jfeスチール株式会社 ,  Jfe Steel Corp

Inventor： TAKASHITA TAKUYA ,  NAKAMURA NAOMICHI

IPC: B22F1/00 ,  C22C38/00 ,  H01F1/24

CPC classification number: H01F3/08 ,  B22F1/00 ,  B22F1/0011 ,  C22C38/00 ,  C22C38/001 ,  C22C38/004 ,  C22C2202/02 ,  H01F1/147 ,  H01F1/20 ,  H01F1/24

Abstract: 【課題】鉄粉を成形し歪取焼鈍した後であっても、ヒステリシス損が低い圧粉磁芯を製造するための圧粉磁芯用鉄粉を提供する。【解決手段】圧粉磁芯用鉄粉を、見掛密度:3.8g/cm3以上で、平均粒子径(D50):80μm以上とし、さらに、粒子径100μm以上の粉末のうち、60%以上の粉末内部の結晶粒径を80μm以上とし、粉末の母相の面積に占める介在物の面積分率を0.4%以下として、粉末断面のマイクロビッカース硬度(試験力:0.245N)を90Hv以下とする。【選択図】なし

Abstract translation: 要解决的问题：即使在形成铁粉后，即使在形成铁粉和退火以后，也可以提供用于制造磁滞损失低的粉尘芯的铁粉的铁粉，并且对应变去除进行退火。解决方案：粉芯的铁粉的表观密度为3.8 g / cm 3以上，平均粒径（D50）为80μm以上，晶粒尺寸为80μm以上的晶粒尺寸为60％以上，晶粒尺寸为100μm以上的粉末部分的晶粒尺寸为60μm以上，夹杂物的面积分数占据 在粉末的主体相中为0.4％以下，微维氏硬度为90Hv以下的粉末截面，试验力为0.245N。

公开(公告)号：JP2014118630A

公开(公告)日：2014-06-30

申请号：JP2012277424

申请日：2012-12-19

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： TAKASHITA TAKUYA ,  NAKAMURA NAOMICHI

IPC: B22F1/00 ,  C22C38/00 ,  H01F1/20

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: PROBLEM TO BE SOLVED: To provide iron powder for dust core having excellent compressibility and also having low core loss after molding.SOLUTION: In the iron powder for a dust core, the content of Si is 0.01 mass% or lower, apparent density is 3.8 g/cmor higher, the ratio of iron powder grain size that is 45 μm or smaller is 10 mass% or lower, the ratio of iron powder grain size that is larger than 180 and 250 μm or smaller is below 30 mass%, the ratio of iron powder grain size that is larger than 250 μm is 10 mass% or lower, and the Vickers hardness (test force: 0.245 N) of the cross section of the powder is 80 Hv or lower.

Abstract translation: 要解决的问题：提供具有优异的压缩性和成型后的低铁损的粉芯的铁粉。解决方案：在粉芯的铁粉中，Si的含量为0.01质量％以下，表观密度为3.8 g / cm 3以下，铁粉粒径在45μm以下的比例为10质量％以下，铁粉粒径比180以上且250μm以下的铁粉比例低于30质量％，则比例 大于250μm的铁粉粒径为10质量％以下，粉末截面的维氏硬度（试验强度：0.245N）为80Hv以下。