公开(公告)号：US20250115974A1

公开(公告)日：2025-04-10

申请号：US18832012

申请日：2023-03-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Yusuke KAWAMURA

IPC: C21D10/00 ,  H01F1/16

Abstract: In the grain-oriented electrical steel sheet according to an aspect of the present invention, a magnetic domain refinement treatment line, which is a part on which a magnetic domain refinement treatment is performed, exists in a magnetic domain control treatment lines which form an angle of 0° to 45° with respect to an orthogonal-to-rolling direction and are arranged in a rolling direction. It is preferable that the average magnetic domain width in an area, in which the magnetic domain refinement treatment line does not exist among the magnetic domain control treatment lines, and of which the length is 1 mm or more, is 500 μm or less. Alternatively it is preferable that the average magnetic domain width in an area, in which the magnetic domain refinement treatment line does not exist among the magnetic domain control treatment lines, and which includes two or more of magnetic walls, is 500 μm or less.

公开(公告)号：US20240096540A1

公开(公告)日：2024-03-21

申请号：US18032519

申请日：2021-10-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Yusuke KAWAMURA ,  Takahito MIZUMURA

IPC: H01F27/245 ,  H01F1/147

CPC classification number: H01F27/245 ,  H01F1/14775

Abstract: This wound core is a wound core including a wound core main body obtained by stacking a plurality of polygonal annular grain-oriented electrical steel sheets in a side view, and the grain-oriented electrical steel sheet has planar portions and bent portions that are alternately continuous in a longitudinal direction, and in at least one bent portion, the crystal grain size Dpx (mm) of the grain-oriented electrical steel sheet is FL/4 or more. Here, FL the an average length (mm) of the planar portions.

公开(公告)号：US20230084111A1

公开(公告)日：2023-03-16

申请号：US17796217

申请日：2020-02-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi NAKAMURA ,  Yusuke KAWAMURA

IPC: C22C38/02 ,  C22C38/12 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00

Abstract: A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when a grain size RAαC, a grain size RAβC, and a grain size RAγC are defined in a transverse direction C, the grain sizes satisfy RAγC

公开(公告)号：US20230071853A1

公开(公告)日：2023-03-09

申请号：US17797072

申请日：2020-02-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi NAKAMURA ,  Yusuke KAWAMURA

IPC: H01F1/147 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/34 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00

Abstract: A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when a grain size RAαL, a grain size RAβL, and a grain size RAγL are defined in a rolling direction L, the grain sizes satisfy RAβL

公开(公告)号：US20210355557A1

公开(公告)日：2021-11-18

申请号：US17263824

申请日：2019-07-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi NAKAMURA ,  Yusuke KAWAMURA ,  Shota MORIMOTO

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/02 ,  C22C38/12

Abstract: A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when (α1 β1 γ1) and (α2 β2 γ2) represent deviation angles of crystal orientations measured at two measurement points which are adjacent on the sheet surface and which have an interval of 1 mm, the boundary condition BA is defined as [(α2−α1)2+(β2−β1)2+(γ2−γ1)2]1/2≥0.5°, and the boundary condition BB is defined as [(α2−α2)2+(β2−β1)2+(γ2−γ1)2]1/2≥2.0°, the boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included.

公开(公告)号：US20250118469A1

公开(公告)日：2025-04-10

申请号：US18729419

申请日：2023-03-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Yusuke KAWAMURA

IPC: H01F1/147

Abstract: On a surface of the grain-oriented electrical steel sheet, a rate (a groove existence rate) of a part (a groove formation line) where a groove having a depth of 5 μm to 50 μm and a width of 10 μm to 300 μm exists among a total extension of magnetic domain control treatment lines which forms an angle of 0° to 45° with respect to an orthogonal-to-rolling direction and are arranged in a rolling direction is 50% or more in a first region which is a region where a β angle which is a deviation angle of a grain from a Goss orientation around an axis in the orthogonal-to-rolling direction is 1° or less, and the groove existence rate is less than 50% in a second region where the β angle is more than 2°.

公开(公告)号：US20220372589A1

公开(公告)日：2022-11-24

申请号：US17263840

申请日：2019-07-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi NAKAMURA ,  Yusuke KAWAMURA

IPC: C21D8/12 ,  C21D9/46 ,  C22C38/02 ,  C22C38/00 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

Abstract: A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when (α1 β1 γ1) and (α2 β2 γ2) represent deviation angles of crystal orientations measured at two measurement points which are adjacent on the sheet surface and which have an interval of 1 mm, the boundary condition BA is defined as |γ2−γ1|≥0.5°, and the boundary condition BB is defined as [(α2−α1)2+(β2−β1)2+(γ2−γ1)2]1/2≥2.0°, the boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included.

公开(公告)号：US20230395300A1

公开(公告)日：2023-12-07

申请号：US18033131

申请日：2021-10-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Yusuke KAWAMURA ,  Takahito MIZUMURA

IPC: H01F27/245 ,  H01F1/147 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C21D3/04 ,  C21D1/74

CPC classification number: H01F27/245 ,  H01F1/14775 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16 ,  C22C38/04 ,  C22C38/06 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D6/005 ,  C21D6/008 ,  C21D3/04 ,  C21D1/74 ,  C22C2202/02 ,  C21D2201/05

Abstract: This wound core is a wound core including a wound core main body obtained by laminating a plurality of polygonal annular grain-oriented electrical steel sheets in a side view, and the grain-oriented electrical steel sheet has planar portions and bent portions that are alternately continuous in a longitudinal direction, and in at least one bent portion, the crystal grain size Dpx of the grain-oriented electrical steel sheet is 2 W or less.

公开(公告)号：US20230395293A1

公开(公告)日：2023-12-07

申请号：US18033110

申请日：2021-10-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Yusuke KAWAMURA ,  Takahito MIZUMURA

IPC: H01F3/02 ,  H01F1/147

CPC classification number: H01F3/02 ,  H01F1/14775

Abstract: Provided is a wound core including: a substantially rectangular wound core main body in a side view, in which the wound core main body includes a portion in which grain-oriented electrical steel sheets in which planar portions and corner portions are alternately continuous in a longitudinal direction and an angle formed by two planar portions adjacent to each other with each of the corner portions therebetween is 90° are stacked in a sheet thickness direction and has a substantially rectangular laminated structure in a side view, each of the corner portions has two or more bent portions having a curved shape in a side view of the grain-oriented electrical steel sheets 1, the sum of bent angles of the bent portions present in one corner portion is 90°, each bent portion in a side view has an inner side radius of curvature r of 1 mm to 5 mm, and interlaminar friction coefficients which are dynamic friction coefficients of the laminated grain-oriented electrical steel sheets in at least some of the planar portions are 0.20 or more.

公开(公告)号：US20210246524A1

公开(公告)日：2021-08-12

申请号：US17263846

申请日：2019-07-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi NAKAMURA ,  Yusuke KAWAMURA ,  Shingo OKADA ,  Tomoaki ITO ,  Shinya YANO

IPC: C21D8/12 ,  H01F1/147 ,  C21D9/46 ,  C22C38/02 ,  C22C38/00 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

Abstract: A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when (α1 β1 γ1) and (α2 β2 γ2) represent deviation angles of crystal orientations measured at two measurement points which are adjacent on the sheet surface and which have an interval of 1 mm, the boundary condition BA is defined as |β2−β1|≥0.5°, and the boundary condition BB is defined as [(α2−α1)2+(β2−β1)2+(γ2−γ1)2]1/2≥2.0°, the boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included.