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Title:
PRODUCTION METHOD FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRIMARY RECRYSTALLIZED STEEL SHEET FOR PRODUCTION OF GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2014/104394
Kind Code:
A1
Abstract:
In the present invention, a grain-oriented electrical steel sheet that has suitable characteristics and in which variations in magnetic characteristics are greatly reduced is produced in an industrially stable manner when producing a grain-oriented electrical steel sheet using, as a raw material, a steel slab that comprises, in mass% or mass ppm, 0.08% or less of C, 2.0-4.5% or less of Si, and 0.5% or less of Mn, and in which S, Se, and O are each limited to less than 50 ppm, sol.Al is limited to less than 100 ppm, N is controlled so as to constitute 80 ppm or less and be within a range that satisfies sol.Al (ppm) - N (ppm) × (26.98/14.00) ≤ 30 ppm, and the remainder comprises a composition of Fe and unavoidable impurities. The grain-oriented electrical steel sheet is produced by: performing a nitriding treatment in which the nitrogen increase amount (ΔN) is defined by either the expression (1) or the expression (2), said nitriding treatment being performed either before primary recrystallization annealing, during annealing, or after annealing; causing silicon nitride (Si3N4) to be deposited on the grain boundaries; and causing the silicon nitride to function as a limiting force for normal grain growth. Expression (1): when sol.Al - N × (26.98/14.00) ≤ 0, 50 ppm ≤ ΔN ≤ 1000 ppm. Expression (2): when 0 < sol.al - N × (26.98/14.00) ≤ 30, (N - sol.Al × 14.00/26.98 + 100) ≤ ΔN ≤ (N - sol.Al × 14.00 / 26.98 + 1000).

Inventors:
SHINGAKI, Yukihiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
YAMAGUCHI, Hiroi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
WAKISAKA, Yuiko (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
MATSUDA, Hiroshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
TERASHIMA, Takashi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
Application Number:
JP2013/085322
Publication Date:
July 03, 2014
Filing Date:
December 25, 2013
Export Citation:
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Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, 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
JPH11335738A1999-12-07
JPH11335736A1999-12-07
JP2007314823A2007-12-06
JP2006316314A2006-11-24
US1965559A1934-07-03
JPS4015644B
JPS5113469B21976-04-28
JP2782086B21998-07-30
JP2000129356A2000-05-09
Other References:
See also references of EP 2940159A4
Attorney, Agent or Firm:
SUGIMURA, Kenji (36F Kasumigaseki Common Gate West, 3-2-1 Kasumigaseki, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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