Title:
METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/157765
Kind Code:
A1
Abstract:
The present invention provides a method for producing a grain-oriented electromagnetic steel sheet, the method preventing the occurrence of a secondary recrystallization defect at the edges of a product sheet in the sheet width direction, while effectively suppressing the occurrence of edge cracking during hot rolling. According to this method for producing a grain-oriented electromagnetic steel sheet, a grain-oriented electromagnetic steel sheet is produced by subjecting a steel slab that contains an inhibitor forming component to heating, hot rolling, hot rolled sheet annealing if necessary, cold rolling, primary recrystallization annealing that doubles as decarburization annealing, and finish annealing after application of an annealing separator. In the heating step of the steel slab in this method, after being heated to a temperature of 900°C to 1300°C, the steel slab is subjected to edging of 50 mm to 200 mm per one side and to horizontal rolling, and is subsequently re-heated, while controlling the temperature of the slab after the horizontal rolling so that if Tc (°C) is the surface temperature of the center part in the width direction, Te (°C) is the surface temperature of the edges in the width direction, and R (°C/s) is the average heating rate in the sheet width direction over the range from 700°C to 900°C in a heating process in which the steel sheet after the hot rolling is subjected to the first annealing, the relational expression R ≥ 5 + (Tc - Te)/20 is satisfied.
Inventors:
TAKENAKA MASANORI (JP)
IMAMURA TAKESHI (JP)
TANAKA TAKAAKI (JP)
IMAMURA TAKESHI (JP)
TANAKA TAKAAKI (JP)
Application Number:
PCT/JP2023/004544
Publication Date:
August 24, 2023
Filing Date:
February 10, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C22C38/00; C22C38/60; H01F1/147
Domestic Patent References:
| WO2022250112A1 | 2022-12-01 |
Foreign References:
| JPH05140650A | 1993-06-08 | |||
| JPH07224325A | 1995-08-22 | |||
| JPH116015A | 1999-01-12 | |||
| JP2011219793A | 2011-11-04 | |||
| KR20060074646A | 2006-07-03 |
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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