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Title:
METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEETS HAVING EXCELLENT MAGNETIC PROPERTIES
Document Type and Number:
WIPO Patent Application WO/2013/089297
Kind Code:
A1
Abstract:
The present invention relates to a method for manufacturing a grain-oriented electric steel sheet. In the method for manufacturing the grain-oriented electric steel sheet, a grain-oriented electric steel sheet slab is heated and hot-rolled, and then a hot band annealing process is performed or omitted, and also, a cold rolling process is performed once or performed two times with intermediate annealing therebetween, and then primary and secondary recrystallization annealing processes are successively performed. Also, the primary recrystallization annealing process comprises: an ultra fast heat-up step of heating up to a mean heat-up rate of about 300℃/sec or more; a fast heat-up step of heating up to a mean heat-up rate of about 100℃/sec or more that is less than the mean heat-up rate in the ultra fast heat-up step after the ultra fast heat-up step is performed; and a normal heat-up step of heating up to a mean heat-up rate that is less than that in the fast heat-up step after the fast heat-up step is performed. According to the present invention, a three-stage heat-up pattern (ultra fast heat-up + fast heat-up + normal heat-up) may be applied to the heat-up step of the primary recrystallization annealing process to increase a Goss orientation, particularly a volume fraction of an exact Goss orientation crystal grain, thereby improving integration of the crystal orientation to manufacture the grain-oriented electrical steel sheet with extremely low core loss and high flux density.

Inventors:
JOO HYUNG-DON (KR)
KIM CHANG-SOO (KR)
PARK JONG-TAE (KR)
PARK JONG-HO (KR)
KIM BYEONG-GOO (KR)
SEO JIN-WOOK (KR)
Application Number:
PCT/KR2011/009704
Publication Date:
June 20, 2013
Filing Date:
December 16, 2011
Export Citation:
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Assignee:
POSCO (KR)
JOO HYUNG-DON (KR)
KIM CHANG-SOO (KR)
PARK JONG-TAE (KR)
PARK JONG-HO (KR)
KIM BYEONG-GOO (KR)
SEO JIN-WOOK (KR)
International Classes:
C22C38/00; C21D8/12; C21D9/46
Foreign References:
JP2008001979A2008-01-10
JP2003003213A2003-01-08
JP2002212636A2002-07-31
JP2002060842A2002-02-28
JP2000199015A2000-07-18
Attorney, Agent or Firm:
HONG, SUNG-CHUL (KR)
홍성철 (KR)
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Claims: