Title:
METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/167303
Kind Code:
A1
Abstract:
The present invention provides a means for suppressing propagation of edge cracking. The present invention provides a method for producing a grain-oriented electromagnetic steel sheet, the method comprising a step in which after hot rolling a silicon-containing steel slab, cold rolling is performed on the hot-rolled silicon-containing steel slab once, or two or more times with process annealing carried out therebetween, the cold-rolled silicon-containing steel slab is subjected to decarburization annealing, and after being applied with an annealing separator, the silicon-containing steel slab is wound into a coil and is subjected to finish annealing, and subsequently to flattening annealing. With respect to this method for producing a grain-oriented electromagnetic steel sheet, when the coil is introduced into a finish annealing furnace, a local strain having an indentation amount of 5 µm to 30 µm from the steel sheet surface is applied to a linear region which continuously or discontinuously extends in a direction that intersects the axial direction of the coil and is apart from an end of the coil in the axial direction, the end being in contact with a coil stage of the finish annealing furnace, by 5 mm to 20 mm in the axial direction, and the finish annealing is subsequently performed, thereby growing crystal grains that have a misorientation angle of 15 degrees or more from a Goss-oriented grain in 50% or more of the entire length of the linear region.
Inventors:
IZUMI RIEKO (JP)
TAKAMIYA TOSHITO (JP)
FUJITA AKIO (JP)
NAKASHIMA TORU (JP)
OKADA NORIHISA (JP)
TAKAMIYA TOSHITO (JP)
FUJITA AKIO (JP)
NAKASHIMA TORU (JP)
OKADA NORIHISA (JP)
Application Number:
PCT/JP2023/007916
Publication Date:
September 07, 2023
Filing Date:
March 02, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; H01F1/147; C22C38/00; C22C38/04; C22C38/60
Domestic Patent References:
| WO2014080763A1 | 2014-05-30 |
Foreign References:
| JP2001323322A | 2001-11-22 | |||
| JP2000038616A | 2000-02-08 | |||
| JP2021025128A | 2021-02-22 | |||
| JPS6442530A | 1989-02-14 | |||
| JPS63100131A | 1988-05-02 | |||
| KR20030039583A | 2003-05-22 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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