Title:
METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2022/250160
Kind Code:
A1
Abstract:
Provided is a method for producing a grain-oriented electrical steel sheet with which it is possible to obtain, in a stable manner, satisfactory coating characteristics along the entire length and the entire width of a steel sheet coil. The method for producing a grain-oriented electrical steel sheet includes a step for: hot rolling a steel member containing, by mass, 2.0-5.0% (inclusive) of Si, 0.01-0.50% (inclusive) of Mn, and a total of 0.001-0.100% (inclusive) of S and/or Se; subsequently performing cold rolling once or cold rolling twice or more interspersed with intermediate annealing; then performing decarburization annealing thereafter; applying an annealing separator mainly comprising MgO; performing finishing annealing thereafter; and subsequently performing flattening annealing. The finishing annealing is carried out in an atmosphere in which the atmosphere gas flows at a rate of 0.2 L/min or above per ton of the steel sheet and the dew point is 10°C or less. The flattening annealing is accompanied by a coating process that includes application of a coating sooution, and before the coating liquid is applied an acid-washing process of 1–60 seconds (inclusive) is performed at a temperature of 15°C or higher using an acid having a concentration of 1–20% (inclusive).
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Inventors:
IMAMURA TAKESHI (JP)
YOSHIKAWA AYAKA (JP)
TAKENAKA MASANORI (JP)
TAMURA KAZUAKI (JP)
YOSHIKAWA AYAKA (JP)
TAKENAKA MASANORI (JP)
TAMURA KAZUAKI (JP)
Application Number:
PCT/JP2022/021833
Publication Date:
December 01, 2022
Filing Date:
May 27, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C23C22/00; H01F1/147; C22C38/00; C22C38/60
Foreign References:
| JPH02125815A | 1990-05-14 | |||
| JPH0230778A | 1990-02-01 | |||
| JPH10158744A | 1998-06-16 | |||
| JPH09111346A | 1997-04-28 | |||
| US20160108488A1 | 2016-04-21 | |||
| JPS4015644B1 | ||||
| JPS5113469B2 | 1976-04-28 | |||
| JP2000129356A | 2000-05-09 | |||
| JPH0230778A | 1990-02-01 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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