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Title:
HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2011/004779
Kind Code:
A1
Abstract:
Provided are a high-strength steel sheet with superior post-processing stretch flange characteristics and a manufacturing method therefor. The composition thereof comprises, in mass%, a range from 0.08% to 0.20% of carbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese, up to 0.04% of phosphorus, up to 0.005% of sulfur, up to 0.05% of aluminum, 0.07% to 0.20% of titanium, and 0.20% to 0.80% of vanadium, with the remainder comprising iron and unavoidable impurities. Additionally, the structure is from 80% to 98% a ferrite phase and a second phase by volume. Furthermore, the total amount of titanium and vanadium comprised in deposits with a size of less than 20nm is more than 0.150 mass%. The difference (HVα-HVS) between the hardness (HVα) of the aforementioned ferrite phase and the hardness (HVS) of a bainite phase is in the range of -300 to 300.

Inventors:
NAKAGAWA, Koichi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
中川功一 (〒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)
YOKOTA, Takeshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
横田毅 (〒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)
SETO, Kazuhiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
瀬戸一洋 (〒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)
KINOSHIRO, Satoshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
城代哲史 (〒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:
JP2010/061363
Publication Date:
January 13, 2011
Filing Date:
June 29, 2010
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)
NAKAGAWA, Koichi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
中川功一 (〒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)
YOKOTA, Takeshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
横田毅 (〒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)
SETO, Kazuhiro (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
瀬戸一洋 (〒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)
KINOSHIRO, Satoshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
International Classes:
C22C38/00; C21D9/46; C22C38/14; C22C38/38
Foreign References:
JP2009167475A2009-07-30
JP2006161111A2006-06-22
JP2007009322A2007-01-18
JP2009084643A2009-04-23
JP2009007659A2009-01-15
JP2009052139A2009-03-12
JP2007063668A2007-03-15
JP2006161112A2006-06-22
JP2004143518A2004-05-20
JP2004360046A2004-12-24
JP2005002406A2005-01-06
JP2005232567A2005-09-02
JP2006183138A2006-07-13
JP2006183139A2006-07-13
JP2007016319A2007-01-25
JP2003105444A2003-04-09
JPH04289120A1992-10-14
JP2003096543A2003-04-03
Other References:
See also references of EP 2453032A4
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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