Title:
HIGH STRENGTH THIN STEEL PLATE EXCELLENT IN ELONGATION AND BORE EXPANDING CHARACTERISTICS AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2006/038708
Kind Code:
A1
Abstract:
A high strength thin steel plate, characterized in that it has a chemical composition, in mass %, that C: 0.03 to 0.25 %, Si: 0.4 to 2.0, Mn: 0.8 to 3.1 %, P ≤ 0.02 %, S ≤ 0.02 %, Al ≤ 2.0 %, N ≤ 0.01 % and the balance: Fe, and a microstructure wherein ferrite is 10 to 85 area %, retained austenite is 1 to 10 vol %, tempered martensite is 10 to 60 area %, and the balance is bainite; and a method for producing the above high strength thin steel plate on an industrial scale. The above high strength thin steel plate has a tensile strength of 500 MPa or more, and also is excellent in elongation and bore expanding characteristics.
Inventors:
NONAKA TOSHIKI (JP)
TANIGUCHI HIROKAZU (JP)
GOTO KOICHI (JP)
TANIGUCHI HIROKAZU (JP)
GOTO KOICHI (JP)
Application Number:
PCT/JP2005/018724
Publication Date:
April 13, 2006
Filing Date:
October 05, 2005
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
NONAKA TOSHIKI (JP)
TANIGUCHI HIROKAZU (JP)
GOTO KOICHI (JP)
NONAKA TOSHIKI (JP)
TANIGUCHI HIROKAZU (JP)
GOTO KOICHI (JP)
International Classes:
C22C38/00; B21B3/00; C21D9/46; C22C38/06; C22C38/38
Foreign References:
| JP2001207235A | 2001-07-31 | |||
| JP2001207236A | 2001-07-31 | |||
| JP2001003150A | 2001-01-09 | |||
| JP2004068050A | 2004-03-04 | |||
| JPH0967645A | 1997-03-11 | |||
| JP2003171735A | 2003-06-20 |
Other References:
See also references of EP 1808505A4
Attorney, Agent or Firm:
Aoki, Atsushi (Toranomon 37 Mori Bldg., 5-1, Toranomon 3-chome, Minato-ku Tokyo, JP)
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