Title:
GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET AND MANUFACTURING METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2020/012666
Kind Code:
A1
Abstract:
This grain-oriented electromagnetic steel sheet contains, in mass%, not more than 0.010% of C, 2.50 to 4.00% of Si, not more than 0.010% of acid soluble Al, not more than 0.012% of N, not more than 1.00% of Mn, and not more than 0.020% of S, with the remainder being made up of Fe and unavoidable impurities. The grain-oriented electromagnetic steel sheet has a tensile strength insulating film on its surface, and a SiO2
intermediate oxide film layer, the average film thickness of which is 1.0nm to 1.0μm, inclusive, in the interface between the tensile strength insulating film and the surface of the steel sheet. In reflection type infrared emission spectrometry of the surface of the SiO2 intermediate oxide film layer, 1250(cm-1) peak intensity IA and 1200(cm-1) peak intensity IB satisfy the following relation: IB/I A ≥ 0.010.
Inventors:
KATAOKA TAKASHI (JP)
USHIGAMI YOSHIYUKI (JP)
NAKAMURA SHUICHI (JP)
FUJII HIROYASU (JP)
OKUMURA SHUNSUKE (JP)
USHIGAMI YOSHIYUKI (JP)
NAKAMURA SHUICHI (JP)
FUJII HIROYASU (JP)
OKUMURA SHUNSUKE (JP)
Application Number:
PCT/JP2018/026619
Publication Date:
January 16, 2020
Filing Date:
July 13, 2018
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C8/14; C21D9/46; C22C38/00; C22C38/06; C22C38/34; C23C26/00; C23C28/04; H01F1/147
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| WO2016129291A1 | 2016-08-18 |
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Other References:
TETSU-TO-HAGANE, vol. 99, 2013, pages 40
See also references of EP 3822386A4
See also references of EP 3822386A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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