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：US11377705B2

公开(公告)日：2022-07-05

申请号：US16793670

申请日：2020-02-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi Yashiki ,  Kenichi Murakami ,  Nobusato Morishige ,  Hirotoshi Tada ,  Yoshiaki Natori

IPC: C21D8/12 ,  C21D9/46 ,  H01F1/16 ,  C22C38/60 ,  C22C38/00 ,  B32B15/18 ,  B32B15/04 ,  B22D11/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A grain-oriented electrical steel sheet includes a steel layer and an insulation coating arranged in directly contact with the steel layer thereon. The steel layer includes, as a chemical composition, by mass %, 2.9 to 4.0% of Si, 2.0 to 4.0% of Mn, 0 to 0.20% of Sn, and 0 to 0.20% of Sb. In the steel layer, a silicon content and a manganese content expressed in mass % satisfy 1.2%≤Si−0.5×Mn≤2.0%, and a tin content and an antimony content expressed in mass % satisfy 0.005%≤Sn+Sb≤0.20%.

公开(公告)号：US11603575B2

公开(公告)日：2023-03-14

申请号：US16979110

申请日：2019-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi Kataoka ,  Nobusato Morishige ,  Haruhiko Atsumi ,  Kazutoshi Takeda ,  Shin Furutaku ,  Hirotoshi Tada ,  Ryosuke Tomioka

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/34 ,  C22C38/20 ,  C22C38/04 ,  C22C38/00 ,  C22C38/06

Abstract: A grain-oriented electrical steel sheet includes: a silicon steel sheet including Si and Mn; a glass film arranged on a surface of the silicon steel sheet; and an insulation coating arranged on a surface of the glass film, wherein the glass film includes a Mn-containing oxide.

公开(公告)号：US11562840B2

公开(公告)日：2023-01-24

申请号：US16978155

申请日：2019-03-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi Kataoka ,  Ichiro Tanaka ,  Haruhiko Atsumi ,  Kazutoshi Takeda ,  Hirotoshi Tada

IPC: C21D9/46 ,  H01F1/147 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/20 ,  C22C38/34 ,  C22C38/60

Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet having a predetermined chemical composition; a glass coating provided on the surface of the base steel sheet; and a tension-applying insulation coating provided on the surface of the glass coating, in which linear thermal strains having, a predetermined angle (φ) with respect to a transverse direction which is a direction orthogonal to a rolling direction are periodically formed on the surface of the tension-applying insulation coating at predetermined intervals along the rolling direction, a full width at half maximum F1 on the linear thermal strain and a full width at half maximum F2 at an intermediate position between the two linear thermal strains adjacent to each other satisfy 0.00

公开(公告)号：US11866812B2

公开(公告)日：2024-01-09

申请号：US17427535

申请日：2020-02-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro Tanaka ,  Takashi Kataoka ,  Kazutoshi Takeda ,  Masamitsu Kubota ,  Hirotoshi Tada

IPC: C22C38/20 ,  C22C38/34 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C21D9/46 ,  C21D8/02 ,  C21D3/04 ,  C23G1/08 ,  C22C38/60

CPC classification number: C22C38/20 ,  C21D3/04 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/60 ,  C23G1/081 ,  C21D2201/05

Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy (Fe0.5−Fe0.05)/Fe0.5≥0.35. A maximal point of a Cr emission intensity is included between the Fe0.05 and the Fesat. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.