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Title:
METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2017/094797
Kind Code:
A1
Abstract:
In order to improve upon the electromagnetic properties of typical grain-oriented electromagnetic steel sheets, a method is provided for manufacturing a grain-oriented electromagnetic steel sheet, wherein a steel slab, which has a chemical composition containing, in mass%, 0.002-0.080% of C, 2.00-8.00% of Si, 0.02-0.50% of Mn, at least 0.003 and less than 0.010% of acid-soluble Al, 0.005-0.010% in total of S and/or Se, 0.005-1.000% in total of Sn and/or Sb, and less than 0.006% of N, with the remainder comprising Fe and inevitable impurities, is heated at 1300°C or lower, the steel slab is subjected to hot rolling to produce a hot rolled steel sheet, the hot rolled steel sheet is subjected to one cycle of cold rolling or two or more cycles of cold rolling with intermediate annealing performed between cycles to produce a cold rolled steel sheet having a final thickness, the cold rolled steel sheet is subjected to a first recrystallization annealing, an annealing separating agent is applied to the surface of the cold rolled steel sheet after the first recrystallization annealing, and the steel sheet is then subjected to a second recrystallization annealing.

Inventors:
TAKENAKA MASANORI (JP)
HAYAKAWA YASUYUKI (JP)
IMAMURA TAKESHI (JP)
EHASHI YUIKO (JP)
Application Number:
PCT/JP2016/085616
Publication Date:
June 08, 2017
Filing Date:
November 30, 2016
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; B23K15/00; B23K26/352; C22C38/00; C22C38/60; H01F1/147
Foreign References:
JP2003193135A2003-07-09
JP2003253335A2003-09-10
JP2003193131A2003-07-09
JP2012102344A2012-05-31
JP2015168869A2015-09-28
JP2014208907A2014-11-06
JP2016156069A2016-09-01
JP2016089194A2016-05-23
CN103725995A2014-04-16
KR20120071823A2012-07-03
US1965559A1934-07-03
JPS4015644B2
JPS5113469B21976-04-28
JP2782086B21998-07-30
JP2000129356A2000-05-09
Other References:
Y. USHIGAMI ET AL.: "Precipitation Behaviors of Injected Nitride Inhibitors during Secondary Recrystallization Annealing in Grain Oriented Silicon Steel", MATERIALS SCIENCE FORUM, vol. 204-206, 1996, pages 593 - 598
See also references of EP 3385397A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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