Invention Grant
- Patent Title: Grain-oriented electromagnetic steel sheet and method for producing grain-oriented electromagnetic steel sheet
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Application No.: US16342879Application Date: 2017-10-17
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Publication No.: US11326219B2Publication Date: 2022-05-10
- Inventor: Shigehiro Takajo , Takumi Umada , Takashi Terashima
- Applicant: JFE Steel Corporation
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JPJP2016-204244 20161018
- International Application: PCT/JP2017/037588 WO 20171017
- International Announcement: WO2018/074486 WO 20180426
- Main IPC: C21D8/12
- IPC: C21D8/12 ; C21D8/02 ; C23C14/06 ; C23C14/32 ; C23C28/04 ; H01F1/147 ; H01F1/153

Abstract:
Provided are: a grain-oriented electromagnetic steel sheet exhibiting excellent coating film adhesion and excellent magnetic characteristics; and a method for producing this grain-oriented electromagnetic steel sheet. This grain-oriented electromagnetic steel sheet is provided with a ceramic coating film arranged on a steel sheet, and an oxide insulating tension coating film arranged on the ceramic coating film. The ceramic coating film contains a nitride and an oxide; the nitride contains at least one element selected from the group consisting of Cr, Ti, Zr, Mo, Nb, Si, Al, Ta, Hf, W and Y; and the oxide has a corundum crystal structure. The Young's modulus of the ceramic coating film as determined by a nanoindentation method is 230 GPa or more; the average film thickness of the ceramic coating film is from 0.01 μm to 0.30 μm (inclusive); and the tension of the oxide insulating tension coating film is 10 MPa or more.
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