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Title:
GRAIN-ORIENTED ELECTRICAL STEEL SHEET, INTERMEDIATE STEEL SHEET FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET, AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2020/149334
Kind Code:
A1
Abstract:
This grain-oriented electrical steel sheet comprises a base steel sheet, an intermediate layer formed on the surface of the base steel sheet and mainly composed of silicon oxide, and an insulating film formed on the surface of the intermediate layer. The number density of oxides in a region having a depth of 10 μm from the surface of the base steel sheet to the inside of the base steel sheet is 0.020/μm2 or less. In the grain-oriented electrical steel sheet, the area ratio of an intermediate layer remaining region, where the intermediate layer has remained without peeling, in a region where the insulating film peeled off after a bending test conducted using a mandrel according to JIS K 5600-5-1 (1999) is 20% or more.

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Inventors:
YAMAMOTO SHINJI (JP)
USHIGAMI YOSHIYUKI (JP)
TAKATANI SHINSUKE (JP)
Application Number:
PCT/JP2020/001170
Publication Date:
July 23, 2020
Filing Date:
January 16, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C22C38/00; C22C38/60; C23C22/00; H01F1/147
Domestic Patent References:
WO2002088403A12002-11-07
Foreign References:
JPH06184762A1994-07-05
JPH07278833A1995-10-24
JP2002309380A2002-10-23
JPH05263135A1993-10-12
JP2003313644A2003-11-06
JP2016166406A2016-09-15
KR20150073799A2015-07-01
JP2019005200A2019-01-17
JPS4996920A1974-09-13
JPH05279747A1993-10-26
JPH06184762A1994-07-05
JPH0978252A1997-03-25
JPH07278833A1995-10-24
JP2002322566A2002-11-08
JP2002363763A2002-12-18
JP2003313644A2003-11-06
JP2003171773A2003-06-20
JP2002348643A2002-12-04
JP2004342679A2004-12-02
Other References:
See also references of EP 3913083A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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