Invention Grant
- Patent Title: Non-oriented electrical steel sheet and manufacturing method therefor
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Application No.: US16958266Application Date: 2018-12-18
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Publication No.: US11486019B2Publication Date: 2022-11-01
- Inventor: June Soo Park , Dae-Hyun Song
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Morgan, Lewis & Bockius LLP
- Priority: KR10-2017-0179609 20171226
- International Application: PCT/KR2018/016138 WO 20181218
- International Announcement: WO2019/132377 WO 20190704
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D6/00 ; C21D8/00 ; C21D8/12 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/14 ; C22C38/60

Abstract:
The present invention relates to a non-oriented electrical steel sheet including 1.5 to 4.0 wt % of Si, 0.1 to 1.5 wt % of Al, 0.1 to 1.5 wt % of Mn, 0.005 wt % or less (excluding 0%) of C, 0.005 wt % or less (excluding 0%) of N, 0.005 wt % or less (excluding 0%) of Ti, 0.001 to 0.005 wt % of S, 0.1 wt % or less (excluding 0%) of P, 0.02 to 0.2 wt % of at least one of Sn and Sb, and a balance of Fe and other inevitable impurities; and satisfying the following Formulas 1, 2, and 3. 0.9≤[Al]+[Mn]≤2.1 [Formula 1] 0.2≤([Si]+[Al]+[Mn]/2)*([P]+[Sn]+[Sb])≤0.4 [Formula 2] (Gscenter−Gssurface)/(Gscenter*t)≤0.5 [Formula 3] (In Formula 1 and Formula 2, [Al], [Mn], [Si], [P], [Sn], and [Sb] represent the content (weight %) of Al, Mn, Si, P, Sn, and Sb, respectively, and
in Formula 3, t represents the thickness (mm) of the non-oriented electrical steel sheet, Gssurface represents the average grain size (μm) from 0 to t/4 or 3t/4 to t based on the thickness direction of the non-oriented steel sheet, Gscenter represents the average grain size (μm) from more than t/4 to less than 3t/4 based on the thickness direction of the non-oriented steel sheet.)
in Formula 3, t represents the thickness (mm) of the non-oriented electrical steel sheet, Gssurface represents the average grain size (μm) from 0 to t/4 or 3t/4 to t based on the thickness direction of the non-oriented steel sheet, Gscenter represents the average grain size (μm) from more than t/4 to less than 3t/4 based on the thickness direction of the non-oriented steel sheet.)
Public/Granted literature
- US20200332388A1 NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR Public/Granted day:2020-10-22
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