Title:
METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2018/151296
Kind Code:
A1
Abstract:
Through the present invention, excellent magnetic characteristics can be stably obtained for a grain-oriented electrical steel sheet manufactured from a thin slab without using an inhibitor-forming component. A method for manufacturing a grain-oriented electrical steel sheet, comprising heating and then hot-rolling a slab to obtain a hot-rolled steel sheet, cold-rolling the hot-rolled steel sheet with or without annealing of the hot-rolled sheet to obtain a cold-rolled steel sheet having the final sheet thickness, performing a primary recrystallization annealing of the cold-rolled steel sheet, and performing a secondary recrystallization annealing of the cold-rolled steel sheet after the primary recrystallization annealing, wherein the step for heating the slab is performed at a heating temperature of 1000°C to 1300°C and for a heating time of 60 seconds to 600 seconds, when the hot-rolled-sheet annealing is performed, the time to reach a temperature of 900°C from a temperature of 400°C over the course of increasing the temperature in the hot-rolled-sheet annealing is 100 seconds or less and the soaking temperature is 950°C or higher, and when hot-rolled-sheet annealing is not performed, the cold rolling is performed twice or more with an intermediate annealing therebetween, the time to reach a temperature of 900°C from a temperature of 400°C over the course of increasing the temperature in the first intermediate annealing is 100 seconds or less, and the soaking temperature is 950°C or higher.
Inventors:
TAKENAKA MASANORI (JP)
IMAMURA TAKESHI (JP)
EHASHI YUIKO (JP)
YAMAGUCHI HIROI (JP)
IMAMURA TAKESHI (JP)
EHASHI YUIKO (JP)
YAMAGUCHI HIROI (JP)
Application Number:
PCT/JP2018/005761
Publication Date:
August 23, 2018
Filing Date:
February 19, 2018
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/00; C21D9/46; C22C38/00; C22C38/60; H01F1/147
Domestic Patent References:
| WO1998046802A1 | 1998-10-22 | |||
| WO2010057913A1 | 2010-05-27 |
Foreign References:
| JP2001303214A | 2001-10-31 | |||
| JP2008069391A | 2008-03-27 | |||
| JPH05105956A | 1993-04-27 | |||
| JP2008031495A | 2008-02-14 | |||
| JP2013512332A | 2013-04-11 | |||
| JP2002212639A | 2002-07-31 | |||
| JP2000129356A | 2000-05-09 |
Other References:
See also references of EP 3584331A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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