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Title:
PROCESS FOR PRODUCING GRAIN-ORIENTED MAGNETIC STEEL SHEET WITH HIGH MAGNETIC FLUX DENSITY
Document Type and Number:
WIPO Patent Application WO/2007/136127
Kind Code:
A1
Abstract:
A process for producing a grain-oriented magnetic steel sheet in which slab heating is conducted at a temperature of 1,280°C or lower and the annealing of a hot-rolled sheet is conducted: (a) in a step in which the hot-rolled sheet is heated to a given temperature of 1,000-1,150°C to cause recrystallization and then annealed at a temperature of 850-1,100°C lower than that temperature or (b) by decarburizing the hot-rolled sheet during annealing so that the difference in carbon content between the steel sheet before the annealing and that after the annealing is 0.002-0.02 mass% and the heating in the decarburization/annealing is conducted under such conditions that the heating rate during the period when the temperature of the steel sheet is in the range of 550-720°C is 40 °C/sec or higher, preferably 75-125 °C/sec. Induction heating is used for the rapid heating in the heating step in the decarburization/annealing.

Inventors:
USHIGAMI YOSHIYUKI (JP)
FUJII NORIKAZU (JP)
KIMURA TAKESHI (JP)
ISHIBASHI MAREMIZU (JP)
NAKAMURA SHUUICHI (JP)
YAMASAKI KOUJI (JP)
Application Number:
PCT/JP2007/060752
Publication Date:
November 29, 2007
Filing Date:
May 22, 2007
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
USHIGAMI YOSHIYUKI (JP)
FUJII NORIKAZU (JP)
KIMURA TAKESHI (JP)
ISHIBASHI MAREMIZU (JP)
NAKAMURA SHUUICHI (JP)
YAMASAKI KOUJI (JP)
International Classes:
C21D9/46; B21B3/02; C21D8/12; C22C38/00; C22C38/06; C22C38/60; H01F1/16
Foreign References:
JP2005226111A2005-08-25
JP2003003215A2003-01-08
JPH09296219A1997-11-18
EP1179603A22002-02-13
JP2000178648A2000-06-27
JPH11181524A1999-07-06
JPS6245285B21987-09-25
JPH0277525A1990-03-16
JPH0832929B21996-03-29
JPH09256051A1997-09-30
JP2002060842A2002-02-28
JP2005226111A2005-08-25
JP2003268450A2003-09-25
Other References:
MATERIALS SCIENCE FORUM, vol. 204-206, 1996, pages 593 - 598
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg.5-1, Toranomon 3-chom, Minato-ku Tokyo 23, JP)
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