Title:
PROCESS FOR PRODUCING GRAIN-ORIENTED MAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2012/001971
Kind Code:
A1
Abstract:
Disclosed is a process for producing a grain-oriented magnetic steel sheet, the process comprising production steps that includes a final finish annealing step in which a forsterite coating film is formed on a surface of the steel sheet in an amount of 4.0 g/m2 or more so as to have an average grain diameter of 0.9 µm or less and in which the steel sheet is regulated so as to have a magnetic flux density (B8) of 1.91 T or higher. Laser light having a wavelength of 0.2-0.9 µm is repeatedly irradiated upon the resultant grain-oriented magnetic steel sheet along a linear direction which intersects the rolling direction of the steel sheet. Thus, the grain-oriented magnetic steel sheet can be further reduced in iron loss as compared with conventional grain-oriented magnetic steel sheets.
Inventors:
YAMAGUCHI, Hiroi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
山口 広 (〒11 東京都千代田区内幸町二丁目２番３号 ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
OKABE, Seiji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
岡部 誠司 (〒11 東京都千代田区内幸町二丁目２番３号 ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
山口 広 (〒11 東京都千代田区内幸町二丁目２番３号 ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
OKABE, Seiji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
岡部 誠司 (〒11 東京都千代田区内幸町二丁目２番３号 ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
Application Number:
JP2011/003724
Publication Date:
January 05, 2012
Filing Date:
June 29, 2011
Export Citation:
Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
ＪＦＥスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 〒1000011, JP)
YAMAGUCHI, Hiroi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
山口 広 (〒11 東京都千代田区内幸町二丁目２番３号 ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
OKABE, Seiji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
ＪＦＥスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 〒1000011, JP)
YAMAGUCHI, Hiroi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
山口 広 (〒11 東京都千代田区内幸町二丁目２番３号 ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
OKABE, Seiji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
International Classes:
C21D8/12; B21B3/02; B23K26/00; C21D9/46; C22C38/00; C22C38/04; C22C38/60; C23C22/00; B23K26/08
Attorney, Agent or Firm:
SUGIMURA, Kenji (36F Kasumigaseki Common Gate West, 3-2-1 Kasumigaseki, Chiyoda-k, Tokyo 13, 〒1000013, JP)
Claims:
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