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Title:
GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET MANUFACTURING METHOD AND ROLLING EQUIPMENT FOR MANUFACTURING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/277170
Kind Code:
A1
Abstract:
Provided is a grain-oriented electromagnetic steel sheet manufacturing method by which a low-iron-loss grain-oriented electromagnetic steel sheet having little variation in iron loss can be stably manufactured using a tandem rolling mill. With this grain-oriented electromagnetic steel sheet manufacturing method, a steel material is hot-rolled to obtain a hot-rolled steel sheet, one pass of cold-rolling or two or more passes of cold-rolling with process annealing therebetween are applied to the hot-rolled steel sheet to obtain a cold-rolled sheet having final sheet thickness, and secondary recrystallization annealing is subsequently applied to the cold-rolled sheet after decarburization annealing is applied to the cold-rolled sheet, wherein pre-final-cold-rolling annealing is carried out at an average cooling rate of 20˚C/s or higher in a temperature range of 800˚C to 350˚C, and the final cold-rolling is introduced to the first pass of the tandem rolling mill at the point when the steel sheet has been cooled to 60˚C or lower within 10 seconds after the steel sheet is heated to a temperature range of 70˚C to 200˚C by using the tandem rolling mill.

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Inventors:
SHIMOYAMA YUSUKE (JP)
SHINGAKI YUKIHIRO (JP)
YAMAGUCHI HIROI (JP)
Application Number:
PCT/JP2022/026423
Publication Date:
January 05, 2023
Filing Date:
June 30, 2022
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C22C38/00; C22C38/60; H01F1/147
Domestic Patent References:
WO2020067236A12020-04-02
Foreign References:
JP2020116587A2020-08-06
JPH04120215A1992-04-21
JPH04120216A1992-04-21
JPS5079442A1975-06-27
JPS4839338A1973-06-09
JPS5675579A1981-06-22
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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