Title:
HOT-ROLLED STEEL SHEET AND COLD-ROLLED STEEL SHEET, AND PROCESSES FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2011/077708
Kind Code:
A1
Abstract:
Disclosed are: a hot-rolled steel sheet; a cold-rolled steel sheet which has a thickness of 0.2 mm or less and does not undergo edge cracking; and process for producing the steel sheets.
The hot-rolled steel sheet comprises, in mass%, 0.001 to 0.10% of C, 0.005 to 0.80% of Si, 0.01 to 2.0% of Mn, 0.001 to 0.40% of P, 0.10% or less of S, 0.001 to 0.10% of Al and 0.020% or less of N, with the remainder being Fe and unavoidable impurities, wherein the main phase structure comprises ferrite, the ferrite has an average crystal particle diameter of 10 to 25 μm, and each of the crystal particles of the ferrite has an aspect ratio (Nx/Ny) of 0.70 to 1.00. The cold-rolled steel sheet is produced by the cold-rolling of the hot-rolled steel sheet and has a thickness of 0.2 mm or less.
Inventors:
YASUHARA EIKO (JP)
TATENO BUNGO (JP)
KAWAI TAKAMASA (JP)
TATENO JYUNICHI (JP)
YAMADA MAKOTO (JP)
TATENO BUNGO (JP)
KAWAI TAKAMASA (JP)
TATENO JYUNICHI (JP)
YAMADA MAKOTO (JP)
Application Number:
PCT/JP2010/007407
Publication Date:
June 30, 2011
Filing Date:
December 21, 2010
Export Citation:
Assignee:
JFE STEEL CORP (JP)
YASUHARA EIKO (JP)
TATENO BUNGO (JP)
KAWAI TAKAMASA (JP)
TATENO JYUNICHI (JP)
YAMADA MAKOTO (JP)
YASUHARA EIKO (JP)
TATENO BUNGO (JP)
KAWAI TAKAMASA (JP)
TATENO JYUNICHI (JP)
YAMADA MAKOTO (JP)
International Classes:
C22C38/00; B21B3/00; B21B15/00; C21D9/46; C22C38/58
Foreign References:
| JP2003293083A | 2003-10-15 | |||
| JP2000212689A | 2000-08-02 |
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
Kenji Sugimura (JP)
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