Title:
METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2020/149336
Kind Code:
A1
Abstract:
This method of manufacturing a grain-oriented electrical steel sheet involves controlling the degree of oxidation (PH2O/PH2) in a decarburization annealing step, controlling the mass ratio of MgO and Al2O3 within an annealing separator in an annealing separator application step, controlling the volume ratio of hydrogen in a mixed gas atmosphere to 50% or greater in a final annealing step, washing using a solution to which an inhibitor has been added in an annealing separator removal step, controlling the average roughness Ra by means of chemical polishing in a smoothing step, and using a coating film formation solution that includes a crystalline phosphide in an insulating coating film formation step.
Inventors:
TAKATANI SHINSUKE (JP)
USHIGAMI YOSHIYUKI (JP)
USHIGAMI YOSHIYUKI (JP)
Application Number:
PCT/JP2020/001175
Publication Date:
July 23, 2020
Filing Date:
January 16, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C23C22/00; H01F1/147; C22C38/00; C22C38/60
Domestic Patent References:
| WO2002088403A1 | 2002-11-07 |
Foreign References:
| JPH08222423A | 1996-08-30 | |||
| JPH0347975A | 1991-02-28 | |||
| JPS6479381A | 1989-03-24 | |||
| JPH07278676A | 1995-10-24 | |||
| JPH09118922A | 1997-05-06 | |||
| CN102952931A | 2013-03-06 | |||
| JP2019005085A | 2019-01-17 | |||
| JPS4996920A | 1974-09-13 |
Other References:
See also references of EP 3913081A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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