公开(公告)号：US20240242864A1

公开(公告)日：2024-07-18

申请号：US18562199

申请日：2022-04-27

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihisa ICHIHARA ,  Takeshi OMURA ,  Kunihiro SENDA

IPC: H01F1/147 ,  B23K26/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/60

CPC classification number: H01F1/14783 ,  B23K26/50 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/60 ,  C22C2202/02

Abstract: Provided is a grain-oriented electrical steel sheet that achieves both low iron loss and low magnetostriction and has excellent transformer properties. The grain-oriented electrical steel sheet has a thermal strain-imparted region extending in a direction crossing the rolling direction, where the steel sheet has a closure domain inside the thermal strain-imparted region, the thermal strain-imparted region has maximum points of tensile strain on both outer sides in the rolling direction of the closure domain, and in a strain distribution in the rolling direction of the thermal strain-imparted region, the strain at both outer sides of the closure domain is tensile strain larger than the strain at the center between the maximum points.

公开(公告)号：US20230178276A1

公开(公告)日：2023-06-08

申请号：US17998356

申请日：2021-03-04

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihisa ICHIHARA ,  Takeshi OMURA ,  Hirotaka INOUE ,  Kunihiro SENDA

IPC: H01F1/16

CPC classification number: H01F1/16 ,  C22C2202/02 ,  C22C38/60

Abstract: Provided is a linear groove formation pattern with which both an effect of reducing the building factor and a high magnetic flux density can be obtained. In a grain-oriented electrical steel sheet having a plurality of linear grooves extending in a direction crossing a rolling direction of the steel sheet on a surface of the steel sheet, a surface of the steel sheet between the linear grooves has a recessed defect that is recessed from the surface, a volume fraction of the recessed defect in the steel sheet is 0.0025 vol % or more and 0.01 vol % or less of a steel sheet without the recessed defect, and discontinuous portions that disrupt the extension of the linear grooves are provided at a frequency of 30 or more and 200 or less per square meter of the steel sheet.

公开(公告)号：US20190312495A1

公开(公告)日：2019-10-10

申请号：US16335949

申请日：2017-08-22

Applicant: JFE STEEL CORPORATION

Inventor： Kunihiro SENDA ,  Masanori UESAKA ,  Yoshihiko ODA

IPC: H02K15/02 ,  B21D28/02 ,  B21D28/26

Abstract: A punch processing method for electrical steel sheets to manufacture core segments includes: stacking a plurality of electrical steel sheets; and punching out the plurality of electrical steel sheets in a stacked state simultaneously to manufacture the core segments, wherein in a case where the core segments are applied to a stator core in which a maximum magnetic flux density at a tooth portion is to be higher than a maximum magnetic flux density at a back yoke portion, degrees of Vickers hardness of an electrical steel sheet located second from a bottom side and above in the stacked state are set to 180 HV or higher, and 10 HV or higher than a value of degree of Vickers hardness of an electrical steel sheet located on the bottom side in the stacked state.

公开(公告)号：US20220298599A1

公开(公告)日：2022-09-22

申请号：US17596584

申请日：2020-04-17

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihisa ICHIHARA ,  Takeshi OMURA ,  Kunihiro SENDA

IPC: C21D10/00 ,  H01F1/16

Abstract: Provided is a grain-oriented electrical steel sheet that combines low iron loss and low magnetostriction, together with an advantageous production method therefor. A grain-oriented electrical steel sheet comprises a linear strain portion extending in a direction intersecting a rolling direction of the grain-oriented electrical steel sheet, wherein the linear strain portion has a stress distribution in which a compressive stress region and a tensile stress region alternate in a longitudinal direction of the linear strain portion. The linear strain portion is formed by vibrating the grain-oriented electrical steel sheet in a sheet thickness direction, while irradiating a surface of the grain-oriented electrical steel sheet with an electron beam by repeatedly moving and detaining the electron beam in the direction intersecting the rolling direction of the grain-oriented electrical steel sheet.

公开(公告)号：US20200087746A1

公开(公告)日：2020-03-19

申请号：US16468087

申请日：2017-12-14

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi OMURA ,  Hirotaka INOUE ,  Kunihiro SENDA ,  Seiji OKABE

IPC: C21D9/46 ,  C22C38/60 ,  C22C38/44 ,  C22C38/34 ,  C22C38/04 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  H01F1/147 ,  H01F27/245 ,  H01F41/02

Abstract: Provided is a grain-oriented electrical steel sheet having better transformer iron loss property than conventional grain-oriented electrical steel sheets. A grain-oriented electrical steel sheet comprises: a steel substrate; a forsterite film on a surface of the steel substrate; and a Cr-depleted layer at a boundary between the steel substrate and the forsterite film, the Cr-depleted layer having a Cr concentration that is 0.70 times to 0.90 times a Cr concentration of the steel substrate.

公开(公告)号：US20180037966A1

公开(公告)日：2018-02-08

申请号：US15549578

申请日：2015-02-13

Applicant: JFE STEEL CORPORATION

Inventor： Yasuyuki HAYAKAWA ,  Kunihiro SENDA ,  Takashi TERASHIMA

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/02 ,  C21D8/12 ,  C22C38/60

CPC classification number: C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1238 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  H01F1/16

Abstract: A grain-oriented electrical steel sheet having a composition containing, in mass %, C: 0.005% or less, Si: 2.0% to 4.5%, and Mn: 0.5% or less, and also containing Sb and P in respective ranges satisfying 0.01%≦[% Sb]≦0.20% and 0.02%≦[% P]≦2.0×[% Sb], with a balance being Fe and incidental impurities, wherein when the steel sheet is excited to 1.0 T at 50 Hz in a rolling transverse direction, a magnetizing force (TD-H10) and an iron loss (TD-W10) are respectively (TD-H10)≧200 A/m and (TD-W10)≧1.60 W/kg. Thus, a grain-oriented electrical steel sheet having excellent transformer core loss can be obtained industrially stably at low cost.

公开(公告)号：US20170315093A1

公开(公告)日：2017-11-02

申请号：US15521406

申请日：2015-11-02

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi OMURA ,  Yoshiaki ZAIZEN ,  Kunihiro SENDA

IPC: G01N27/72 ,  G01R33/12

CPC classification number: G01N27/72 ,  G01R33/12 ,  H01F1/16

Abstract: To predict the iron loss of a non-oriented electrical steel sheet after shearing, a non-oriented electrical steel sheet is sheared to a certain width, and iron loss Wt(B0) of the non-oriented electrical steel sheet after shearing is estimated according to a predetermined relational expression based on iron loss Wn(B1) in a non-machining-affected zone in which no machining strain is introduced by the shearing and iron loss Wi(B2) in a machining affected zone in which machining strain is introduced.

公开(公告)号：US20250087396A1

公开(公告)日：2025-03-13

申请号：US18580528

申请日：2022-06-08

Applicant: JFE STEEL CORPORATION

Inventor： Hirotaka INOUE ,  Takeshi OMURA ,  Kunihiro SENDA

IPC: H01F3/02 ,  H01F41/02

Abstract: A wound core with low transformer iron loss and good magnetic characteristics without using two or more types of materials with different magnetic characteristics. The wound core includes a grain-oriented electrical steel sheet as a material and has a flat surface portion, a corner portion adjacent to the flat surface portion, a lap portion in the flat surface portion, and a bent portion in the corner portion, and the ratio of the length of the outer circumference to the length of the inner circumference (the length of the outer circumference/the length of the inner circumference) is 1.80 or less when viewed from the side, and the grain-oriented electrical steel sheet has a magnetic flux density B8 in the range of 1.84 T to 1.91 T at a magnetic field strength H of 800 A/m and has a specified iron loss deterioration rate of 1.50 or less under compressive stress.

公开(公告)号：US20240233991A1

公开(公告)日：2024-07-11

申请号：US18562217

申请日：2022-04-27

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihisa ICHIHARA ,  Takeshi OMURA ,  Kunihiro SENDA

IPC: H01F1/147 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/60

CPC classification number: H01F1/14775 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/60 ,  C22C2202/02

Abstract: Provided is a grain-oriented electrical steel sheet that achieves both low iron loss and low magnetostriction and has excellent transformer properties. The grain-oriented electrical steel sheet has a thermal strain-imparted region extending linearly in a direction crossing the rolling direction, and in the strain distribution in the rolling direction of the thermal strain-imparted region, the strain at both ends of the thermal strain-imparted region is tensile strain larger than the strain at the center of the thermal strain-imparted region.

公开(公告)号：US20220239202A1

公开(公告)日：2022-07-28

申请号：US17611781

申请日：2020-05-15

Applicant: JFE STEEL CORPORATION

Inventor： Souichiro YOSHIZAKI ,  Kunihiro SENDA ,  Yoshiaki ZAIZEN ,  Yukino MIYAMOTO

IPC: H02K15/02 ,  H02K1/02 ,  H02K1/04

Abstract: A method for manufacturing a motor core includes a step of manufacturing a motor core by performing melt-cutting on an electrical steel sheet using heat input from a surface, the electrical steel sheet having an average thermal conductivity in depth positions from the surface to one-third depth of a sheet thickness lower than a thermal conductivity in a middle position in a sheet thickness direction by 30% or greater.