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Title:
PROCESS FOR PRODUCTION OF UNIDIRECTIONAL ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2011/148849
Kind Code:
A1
Abstract:
Disclosed is a process for producing a unidirectional electromagnetic steel sheet, which employs so-called "low-temperature slab heating" that involves a nitriding treatment (step S7), wherein the temperature at which a finishing rolling procedure in hot rolling (step S2) is terminated is 950˚C or lower, cooling is initiated within two seconds after the completion of the finishing rolling, and winding is carried out at a temperature of 700°C or lower. In the process, the cooling rate to be employed during a period between the completion of the finishing rolling and the initiation of the winding is 10°C/sec or more. In the annealing of a hot-rolled steel strip (step S3), the temperature rising rate in a temperature range from 800 to 1000°C is 5°C/sec or more.

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Inventors:
IWANAGA, Isao (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
岩永　功 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
USHIGAMI, Yoshiyuki (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
牛神　義行 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
FUJII, Norikazu (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
藤井　宣憲 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
YAMAMOTO, Norihiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2011/061510
Publication Date:
December 01, 2011
Filing Date:
May 19, 2011
Export Citation:
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Assignee:
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
IWANAGA, Isao (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
岩永　功 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
USHIGAMI, Yoshiyuki (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
牛神　義行 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
FUJII, Norikazu (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
藤井　宣憲 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
International Classes:
C21D8/12; B21B3/02; C22C38/00; C22C38/60; H01F1/16
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (5th Floor, NBF Ikebukuro City Building 17-8, Higashi-Ikebukuro 1-chome, Toshima-k, Tokyo 13, 〒1700013, JP)
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