Title:
METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2020/149337
Kind Code:
A1
Abstract:
This method of manufacturing a grain-oriented electrical steel sheet involves controlling the degree of oxidation (PH2O/PH2), reducing the temperature and then acid washing 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 degree of oxidation in the case that hydrogen is present or controlling the dew point in the case that only an inert gas is present in a final annealing step, washing using a solution to which an inhibitor has been added in an annealing separator removal step, and controlling the mass ratio of phosphoric acid and a metal compound within a coating film formation solution in an insulating coating film formation step.
Inventors:
TAKATANI SHINSUKE (JP)
USHIGAMI YOSHIYUKI (JP)
USHIGAMI YOSHIYUKI (JP)
Application Number:
PCT/JP2020/001176
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 | |||
| JPH07126751A | 1995-05-16 | |||
| JPS6479381A | 1989-03-24 | |||
| JPH07278676A | 1995-10-24 | |||
| JPH09118922A | 1997-05-06 | |||
| CN102952931A | 2013-03-06 | |||
| JP2019005203A | 2019-01-17 | |||
| JPS4996920A | 1974-09-13 |
Other References:
See also references of EP 3913091A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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