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Title:
PROCESS FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2014/104393
Kind Code:
A1
Abstract:
A process for producing a grain-oriented electromagnetic steel sheet using, as a raw material therefor, a steel slab having a composition which contains, in terms of mass% or mass ppm, up to 0.08% C, 2.0-4.5% Si, and up to 0.5% Mn, has S, Se, and O contents reduced to below 50 ppm each and a sol.Al content reduced to below 100 ppm, and has an N content regulated to the range [sol.Al]×(14/27) ppm≤N≤80 ppm, with the remainder comprising Fe and unavoidable impurities, the process comprising cold-rolling the steel slab, thereafter subjecting the steel slab, before initiation of secondary recrystallization/annealing, to a nitriding treatment whereby the nitrogen content is regulated to 50-1,000 mass ppm, incorporating a sulfide and/or a sulfate into an annealing separator in a total amount of 0.2-15 mass%, and conducting secondary recrystallization/annealing so that the steel slab, during the heating, is held for 5 hours or longer in the temperature range of 300-800ºC, thereby precipitating silicon nitride (Si3N4) and MnS and using the silicon nitride and the MnS in combination as a power of inhibiting the growth of normal grains. Thus, unevenness in magnetic property is greatly reduced, and a grain-oriented electromagnetic steel sheet having satisfactory characteristics is industrially stably produced.

Inventors:
HAYAKAWA YASUYUKI (JP)
SHINGAKI YUKIHIRO (JP)
YAMAGUCHI HIROI (JP)
MATSUDA HIROSHI (JP)
WAKISAKA YUIKO (JP)
Application Number:
PCT/JP2013/085321
Publication Date:
July 03, 2014
Filing Date:
December 25, 2013
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; B21B3/00; B21B45/00; C22C38/00; C22C38/60; C23C8/26; C23C8/50; H01F1/16; C23C22/00
Foreign References:
JP2001107147A2001-04-17
JP2000129356A2000-05-09
JP2006152364A2006-06-15
JPH06158167A1994-06-07
JP2007314823A2007-12-06
US1965559A1934-07-03
JPS4015644B
JPS5113469B21976-04-28
JP2782086B21998-07-30
JP2000129356A2000-05-09
Other References:
See also references of EP 2940160A4
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
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