Title:
GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2020/149331
Kind Code:
A1
Abstract:
A grain-oriented electromagnetic steel sheet is provided with: a base steel sheet containing Si and Mn; an intermediate layer arranged on the surface of the base steel sheet and containing silicon oxide as the main component; and an insulation coating film arranged on the surface of the intermediate layer. Substantially no finish-annealed coating film exists on the surface of the base steel sheet. The grain-oriented electromagnetic steel sheet has a Mn-deficient layer in a surface layer region thereof and also has a Mn-rich layer in a region closer to the surface of the insulation coating film than the Mn-deficient layer, wherein the Mn-deficient layer has an Mn content valley part at which the Mn content is smaller than the average Mn content in the base steel sheet in a region deeper than the surface layer region and the Mn-rich layer has an Mn content peak part at which the Mn content is higher than that at the Mn content valley part.
Inventors:
YAMAMOTO SHINJI (JP)
USHIGAMI YOSHIYUKI (JP)
TAKATANI SHINSUKE (JP)
NAKAMURA SHUICHI (JP)
USHIGAMI YOSHIYUKI (JP)
TAKATANI SHINSUKE (JP)
NAKAMURA SHUICHI (JP)
Application Number:
PCT/JP2020/001162
Publication Date:
July 23, 2020
Filing Date:
January 16, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C22C38/00; C22C38/60; C23C22/00; H01F1/147
Foreign References:
| JP2014196559A | 2014-10-16 | |||
| JPH11243005A | 1999-09-07 | |||
| JPS60131976A | 1985-07-13 | |||
| JP2019005201A | 2019-01-17 | |||
| JPH05279747A | 1993-10-26 | |||
| JPH06184762A | 1994-07-05 | |||
| JPH0978252A | 1997-03-25 | |||
| JPH07278833A | 1995-10-24 | |||
| JP4044739B2 | 2008-02-06 |
Other References:
See also references of EP 3913089A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
Download PDF: