公开(公告)号：US20220090242A1

公开(公告)日：2022-03-24

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

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.

公开(公告)号：US20220243315A1

公开(公告)日：2022-08-04

申请号：US17428234

申请日：2020-02-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Takashi KATAOKA ,  Kazutoshi TAKEDA ,  Masamitsu KUBOTA ,  Hirotoshi TADA

IPC: C23C14/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D3/04

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 0.01

公开(公告)号：US20220127692A1

公开(公告)日：2022-04-28

申请号：US17424079

申请日：2020-01-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Satoshi ARAI ,  Masataka IWAKI ,  Masato MIZOKAMI ,  Hideyuki HAMAMURA ,  Takeo ARAMAKI ,  Hirotoshi TADA

IPC: C21D10/00 ,  C21D9/46 ,  H01F1/147

Abstract: A grain-oriented electrical steel sheet includes: a steel sheet and optionally an insulation coating formed on the steel sheet, in which, in a case where a heat treatment of performing retention at 800° C. for 2 hours is performed, regarding a time-magnetostriction waveform (t−λ waveform) when magnetized to 1.7 T, a peak value of a difference waveform obtained by subtracting the time-magnetostriction waveform after the heat treatment from the time-magnetostriction waveform before the heat treatment is 0.01×10−6 or more and 0.20×10−6 or less, and a difference obtained by subtracting an iron, loss before the heat treatment from an iron loss after the heat treatment is 0.03 W/kg or more and 0.17 W/kg or less.

公开(公告)号：US20210043345A1

公开(公告)日：2021-02-11

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

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 (r) 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 Fl 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：US20200181725A1

公开(公告)日：2020-06-11

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 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  B22D11/00 ,  H01F1/16 ,  C22C38/60 ,  B32B15/04 ,  B32B15/18

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%.