公开(公告)号：US20180043474A1

公开(公告)日：2018-02-15

申请号：US15549784

申请日：2016-04-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Hideyuki HAMAMURA ,  Tatsuhiko SAKAI ,  Fumiaki TAKAHASHI ,  Hisashi MOGI ,  Shunsuke OKUMURA ,  Hirofumi IMAI

IPC: B23K26/364 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B23K26/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  B05D3/02 ,  B05D7/14 ,  C22C38/42 ,  C21D9/46

CPC classification number: B23K26/364 ,  B05D3/0254 ,  B05D7/14 ,  B23K26/359 ,  C21D3/04 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D7/00 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1294 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C2202/02 ,  C25F1/00 ,  H01F1/16

Abstract: Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. When an average value of a groove depth in a sheet thickness direction at a central portion of the groove in a longitudinal groove direction is set as an average groove depth D, a straight line, which connects a first point at which a groove depth in the sheet thickness direction becomes 0.05×D and a second point at which the groove depth becomes 0.50×D, at an inclined portion of the groove is set as a groove end straight line, an angle made by the steel sheet surface and the groove end straight line is set as a first angle θ, and an average value of a groove-width-direction length, which is a length of a line segment connecting two points at which a groove depth in the sheet thickness direction in a contour of the groove on the groove-width-direction cross-section becomes 0.05×D, is set as an average groove width W, an aspect ratio A obtained by dividing the average groove depth D by the average groove width W, and the first angle θ satisfy the following Expression (1). θ

公开(公告)号：US20180066334A1

公开(公告)日：2018-03-08

申请号：US15554555

申请日：2016-04-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Hisashi MOGI ,  Fumiaki TAKAHASHI ,  Hideyuki HAMAMURA ,  Tatsuhiko SAKAI ,  Hirofumi IMAI ,  Shunsuke OKUMURA

IPC: C21D9/46 ,  C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  B23K26/364 ,  H01F1/147

CPC classification number: C21D9/46 ,  B23K26/359 ,  B23K26/364 ,  B23K2103/04 ,  C21D3/04 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1283 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/42 ,  C22C38/60 ,  C22C2202/02 ,  H01F1/14783 ,  H01F1/16 ,  H01F1/18

Abstract: Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the groove is seen on a longitudinal groove cross-section including a groove extension direction and the sheet thickness direction, an arithmetic average height Ra of a roughness curve, which constitutes a contour of a groove bottom region of the groove, is 1 μm to 3 μm, and an average length RSm of a roughness curve element, which constitutes the contour of the groove bottom region, is 10 μm to 150 μm.

公开(公告)号：US20180036838A1

公开(公告)日：2018-02-08

申请号：US15554659

申请日：2016-04-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Hideyuki HAMAMURA ,  Tatsuhiko SAKAI ,  Hisashi MOGI ,  Fumiaki TAKAHASHI ,  Hirofumi IMAI ,  Shunsuke OKUMURA

IPC: B23K26/364 ,  C25F3/06 ,  H01F1/16 ,  C21D8/12

CPC classification number: B23K26/364 ,  C21D8/1294 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/60 ,  C25F3/06 ,  H01F1/14766 ,  H01F1/16

Abstract: Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the steel sheet surface is seen from the sheet thickness direction, the steel sheet surface is provided with a groove group that is constituted by a plurality of the grooves arranged in a sheet width direction, the grooves, which constitute the groove group, arc arranged in such a manner that adjacent grooves overlap each other on a projection plane perpendicular to the rolling direction, and a plurality of the groove groups are arranged with an interval in the rolling direction.