公开(公告)号：US12173378B2

公开(公告)日：2024-12-24

申请号：US17422408

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Satoshi Arai ,  Yoshiyuki Ushigami ,  Hideyuki Hamamura ,  Shinji Yamamoto ,  Shunsuke Okumura

IPC: B23K26/352 ,  C21D1/26 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C28/04 ,  H01F1/18

Abstract: The method for manufacturing a grain-oriented electrical steel sheet is a method for manufacturing a grain-oriented electrical steel sheet including a strain region forming process of irradiating the grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4) with an electron beam and forming a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1) on a surface of the base steel sheet (1), wherein, in the strain region forming process, a temperature of a central portion of the strain region (D) in the rolling direction of the base steel sheet (1) and an extension direction of the strain region (D) is heated to 800° C. or higher and 2000° C. or lower.

公开(公告)号：US11651878B2

公开(公告)日：2023-05-16

申请号：US16772544

申请日：2019-01-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Hisashi Mogi ,  Fumiaki Takahashi ,  Hideyuki Hamamura ,  Satoshi Arai

IPC: H01F1/147 ,  C21D8/12

CPC classification number: H01F1/147 ,  C21D8/12

Abstract: A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves and includes two or more broken lines including the grooves having a length of 5 to 10 mm on a straight line intersecting a rolling direction on the steel sheet surface. In each of the broken lines including the grooves, the grooves are arranged at equal intervals, and a ratio of the length of the groove to a length of a non-groove is in a range of 1:1 to 1.5:1.

公开(公告)号：US12031191B2

公开(公告)日：2024-07-09

申请号：US17415816

申请日：2019-12-24

Applicant: NIPPON STEEL CORPORATION

Inventor： Satoshi Arai ,  Hideyuki Hamamura ,  Kazutoshi Takeda ,  Takeo Aramaki ,  Hirotoshi Tada

IPC: H01F1/147 ,  C21D3/04 ,  C21D8/00 ,  C21D8/12 ,  C21D9/46 ,  C23C22/07 ,  C23C22/82

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D8/005 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1288 ,  C23C22/07 ,  C23C22/82 ,  H01F1/147

Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a forsterite-based primary film disposed on a surface of the base steel sheet, and a phosphate-based tension-imparting film containing no chromium, which is disposed on a surface of the primary film. In a case where a Ti content and a S content are respectively expressed as XTi and XS, by mass %, the forsterite-based primary film satisfies Expression (1) and Expression (2). A strain-introduced magnetic domain control is performed on the grain-oriented electrical steel sheet

0.10≤XTi/XS≤10.00  Expression (1)

XTi+XS≥0.10 mass %.  Expression (2)

公开(公告)号：US11898215B2

公开(公告)日：2024-02-13

申请号：US17421850

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki Ushigami ,  Shinji Yamamoto ,  Fumiaki Takahashi ,  Hideyuki Hamamura ,  Shinsuke Takatani ,  Masaru Takahashi

IPC: C21D8/12 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/147

CPC classification number: C21D8/1283 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/147 ,  C21D2201/05 ,  C22C2202/02

Abstract: The grain-oriented electrical steel sheet according to the present invention is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4), and the grain-oriented electrical steel sheet includes a surface of the base steel sheet (1) having a groove (G) which extends in a direction intersecting a rolling direction of the base steel sheet (1), in which in a cross-sectional view of a plane parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1), when a region between end portions of the groove (G) is defined as a groove part (RG), an average thickness of the intermediate layer (4) of the groove part (RG) is 0.5 times or more and 3.0 times or less an average thickness of the intermediate layer (4) other than the groove part (RG), and an area ratio of voids in the insulation coating (3) of the groove part (RG) is 15% or less.

公开(公告)号：US11970751B2

公开(公告)日：2024-04-30

申请号：US17421779

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki Ushigami ,  Shinji Yamamoto ,  Hideyuki Hamamura ,  Takashi Kataoka ,  Shunsuke Okumura

IPC: C21D9/46 ,  C21D3/04 ,  C21D6/00 ,  C21D8/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/147

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1283 ,  C21D8/1294 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/147 ,  C21D2221/00

Abstract: The grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4). The grain-oriented electrical steel sheet according to the present embodiment includes a surface of the base steel sheet (1) having a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1), and a crystalline phosphorus oxide M2P4O13 present in the insulation coating (3) on the strain region (D) in a cross-sectional view of a surface parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1). (M means at least one or both of Fe and Cr.)

公开(公告)号：US11661636B2

公开(公告)日：2023-05-30

申请号：US16981126

申请日：2019-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Nobusato Morishige ,  Takashi Kataoka ,  Haruhiko Atsumi ,  Yasuhiro Mayumi ,  Toshiya Takechi ,  Naoto Masumitsu ,  Tomoya Suenaga ,  Masamitsu Kubota ,  Hideyuki Hamamura ,  Kazuhiko Fukutani

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/20 ,  C22C38/60 ,  C23G1/00 ,  H01F1/147

CPC classification number: C21D9/46 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/20 ,  C22C38/60 ,  C23G1/00 ,  H01F1/14783

Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an aspect of the present invention includes a step of obtaining a hot-rolled steel sheet by carrying out hot rolling on a slab containing a predetermined component composition with a remainder including Fe and impurities, a step of obtaining a hot-rolled annealed sheet by carrying out hot-rolled sheet annealing as necessary, a step of carrying out pickling to obtain a pickled sheet, a step of carrying out cold rolling to obtain a cold-rolled steel sheet, a step of carrying out primary recrystallization annealing, a step of applying an annealing separating agent including MgO to a surface and then carrying out final annealing to obtain a final-annealed sheet, and a step of applying an insulating coating and then carrying out flattening annealing.

公开(公告)号：US11697856B2

公开(公告)日：2023-07-11

申请号：US16967368

申请日：2019-02-06

Applicant: NIPPON STEEL CORPORATION

Inventor： Fumiaki Takahashi ,  Hideyuki Hamamura ,  Satoshi Arai

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/00 ,  H01F1/147

CPC classification number: C21D8/1233 ,  C22C38/00 ,  H01F1/147 ,  C21D9/46 ,  C21D2201/05

Abstract: A grain-oriented electrical steel sheet according to the present invention includes a base steel sheet having plural grooves on a surface and a glass film formed on the surface of the base steel sheet. In case of viewing region including grooves in cross section orthogonal to groove longitudinal direction, a straight line passing through peak point present on profile line of glass film and parallel to groove width direction orthogonal to sheet thickness direction in cross section is defined as reference line, a point present on boundary line between glass film and base steel sheet and present at lowest location in sheet thickness direction is defined as deepest point, and a point present on boundary line and present at the highest location in the sheet thickness direction in region having the deepest point in a center and having length of 2 μm in groove width direction is defined as shallowest point, a relationship between shortest distance A between reference line and deepest point and shortest distance B between reference line and shallowest point satisfies Expression (1).

0.1 μm≤A−B≤5.0 μm  (1)

公开(公告)号：US11551838B2

公开(公告)日：2023-01-10

申请号：US16961286

申请日：2019-02-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Satoshi Arai ,  Hideyuki Hamamura ,  Shunsuke Okumura ,  Kimihiko Sugiyama

IPC: H01F1/147 ,  B23K26/364 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/60 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46

Abstract: A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves. An average protrusion height of the surface protrusion extending along a longitudinal direction of the groove is more than 5 μm and not more than 10 μm. When the surface protrusion is viewed in a cross section including the longitudinal direction of the groove and a normal direction of the steel sheet surface, the surface protrusion includes specific portions each having a height of 50% or more with respect to a height of each peak point appearing on a profile line of the surface protrusion. In the longitudinal direction of the groove, the total length of the specific portions is a length of 30% or more with respect to an overall length of the surface protrusion.