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Title:
GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2019/146697
Kind Code:
A1
Abstract:
This grain-oriented electrical steel sheet comprises a base material steel sheet, a glass coating formed on the base material steel sheet and in contact therewith, and an insulating coating formed on the glass coating and in contact therewith, said insulating coating having a phosphate and a colloidal silica as main constituents. The base material steel sheet contains a prescribed chemical component, and in the glass coating, BN having an average particle diameter of 50-300 nm is present at a prescribed number density within 5 μm from the interface between the glass coating and the base material steel sheet in the depth direction. When the light emission intensity of B is measured from a surface of the insulating film using glow-discharge optical emission spectroscopy, the light emission intensity of the B the interior of the glass coating is greater than the light emission intensity of the B in the interior of the base material steel sheet.

Inventors:
YASUDA MASATO (JP)
USHIGAMI YOSHIYUKI (JP)
TAKAHASHI MASARU (JP)
YANO SHINYA (JP)
Application Number:
PCT/JP2019/002265
Publication Date:
August 01, 2019
Filing Date:
January 24, 2019
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/60; C23C8/26; C23C22/00; H01F1/147; C21D8/12; C21D9/46
Domestic Patent References:
WO2012096350A12012-07-19
WO2011007817A12011-01-20
WO2011007771A12011-01-20
WO2011007817A12011-01-20
WO2008062853A12008-05-29
Foreign References:
JP2004332071A2004-11-25
JP2012144777A2012-08-02
JPH11269544A1999-10-05
KR20120071825A2012-07-03
JP2018010301A2018-01-18
US3905842A1975-09-16
US3905843A1975-09-16
JPH01230721A1989-09-14
JPH01283324A1989-11-14
JPS63140243A1988-06-11
JP2004076146A2004-03-11
JP2012214902A2012-11-08
Other References:
See also references of EP 3744868A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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