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Title:
HOT-ROLLED HIGH-CARBON STEEL SHEETS AND PROCESS FOR PRODUCTION OF THE SAME
Document Type and Number:
WIPO Patent Application WO/2008/020580
Kind Code:
A1
Abstract:
The invention provides a hot-rolled high-carbon steel sheet excellent in the homogeneity in the width direction. The steel sheet contains C: 0.2 to 0.7%, Si: 0.01 to 1.0%, Mn: 0.1 to 1.0%, P: 0.03% or below, S: 0.035% or below, Al: 0.08% or below and N: 0.01% or below with the balance consisting of Fe and unavoidable impurities. The texture of the sheet is characterized by a mean ferrite grain size in the sheet edge of less than 35μm, a mean ferrite grain size in the central area of less than 20μm, and a mean carbide grain size of 0.10μm to less than 2.0μm. The steel sheet of the invention is manufactured by rough rolling, finish rolling at a finishing temperature of (Ar3+40°C) or above, cooling initiated within two seconds after the finish rolling at a cooling rate exceeding 120°C/s until a cooling stop temperature exceeding 550°C and below 650°C, coiling at a temperature of 550°C or below, pickling, and then spheroidizing at a temperature of 670°C to Ac1 transformation point.

Inventors:
IIZUKA, Shunji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 1000011, JP)
飯塚俊治 (〒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)
MITSUZUKA, Kenichi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 1000011, JP)
三塚賢一 (〒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)
AOKI, Naoya (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 1000011, JP)
青木直也 (〒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)
KIMURA, Hideyuki (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 1000011, JP)
Application Number:
JP2007/065788
Publication Date:
February 21, 2008
Filing Date:
August 06, 2007
Export Citation:
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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)
IIZUKA, Shunji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 1000011, JP)
飯塚俊治 (〒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)
MITSUZUKA, Kenichi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 1000011, JP)
三塚賢一 (〒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)
AOKI, Naoya (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 1000011, JP)
青木直也 (〒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)
International Classes:
C22C38/00; B21B3/00; C21D1/26; C21D9/46; C22C38/06; C22C38/14; C22C38/00; B21B3/00; C21D1/26; C21D9/46; C22C38/06; C22C38/14
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JFE TECHNO-RESEARCH CORPORATION 7th Floor Yanagiya Building, 1-10, Nihonbashi 2-chome, Chuo-k, Tokyo 27, 1030027, JP)
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