- Patent Title: Grain oriented electrical steel sheet and producing method thereof
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Application No.: US17258968Application Date: 2018-07-13
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Publication No.: US12123068B2Publication Date: 2024-10-22
- Inventor: Takashi Kataoka , Yoshiyuki Ushigami , Shuichi Nakamura , Hiroyasu Fujii , Shunsuke Okumura
- Applicant: NIPPON STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- International Application: PCT/JP2018/026619 2018.07.13
- International Announcement: WO2020/012666A 2020.01.16
- Date entered country: 2021-01-08
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D6/00 ; C21D8/12 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/16 ; C22C38/18 ; H01F1/14

Abstract:
A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.010% or less of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.020% or less of S; and a balance comprising Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 μm at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, when a surface of the intermediate oxide film layer is analyzed by an infrared reflection spectroscopy, a peak intensity IA at 1250 cm−1 and a peak intensity IB at 1200 cm−1 satisfy IB/IA≥0.010.
Public/Granted literature
- US20210123115A1 GRAIN ORIENTED ELECTRICAL STEEL SHEET AND PRODUCING METHOD THEREOF Public/Granted day:2021-04-29
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