Title:
STEEL SHEET HAVING YIELD STRENGTH OF 670-870 N/mm2 AND TENSILE STRENGTH OF 780-940 N/mm2
Document Type and Number:
WIPO Patent Application WO/2014/103629
Kind Code:
A1
Abstract:
A steel sheet of the present invention contains chemical components within predetermined ranges, while having an α value of 0.13-1.0% by mass, a β value of 8.45-15.2, a yield strength of 670-870 N/mm2, a tensile strength of 780-940 N/mm2, an average crystal grain size of 35 μm or less in the central portion of the steel sheet in the thickness direction, and a thickness of 25-200 mm. In cases where this steel sheet is subjected to stress relieving annealing, this steel sheet may have a Charpy absorbed energy of 100 J or more at -40°C in a portion on which the stress relieving annealing is carried out.
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Inventors:
SAITOH NAOKI (JP)
SAWAMURA MITSURU (JP)
KUREBAYASHI KATSUMI (JP)
TAKAHASHI YASUNORI (JP)
MIYAKE TAKUMI (JP)
SAWAMURA MITSURU (JP)
KUREBAYASHI KATSUMI (JP)
TAKAHASHI YASUNORI (JP)
MIYAKE TAKUMI (JP)
Application Number:
PCT/JP2013/082501
Publication Date:
July 03, 2014
Filing Date:
December 03, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; B23K9/23; B23K31/00; C21D8/02; C22C38/54; B23K103/04
Domestic Patent References:
| WO2010143726A1 | 2010-12-16 |
Foreign References:
| JPH1136042A | 1999-02-09 | |||
| JP2000513050A | 2000-10-03 | |||
| JP2005226158A | 2005-08-25 | |||
| JP2006089789A | 2006-04-06 | |||
| JP2006124773A | 2006-05-18 | |||
| JP2007253199A | 2007-10-04 | |||
| JP2011052320A | 2011-03-17 | |||
| JPS5496416A | 1979-07-30 | |||
| JPS5831069A | 1983-02-23 | |||
| JPS59140355A | 1984-08-11 | |||
| JPS60221558A | 1985-11-06 | |||
| JPH01219121A | 1989-09-01 | |||
| JPH02270934A | 1990-11-06 | |||
| JPH04285119A | 1992-10-09 |
Other References:
TOSHIEI HASEGAWA: "Influence ofNi and Mn on Toughness of MultiPass Weld Heat Affected Zone in Quenched and Tempered High Strength Steels", IRON AND STEEL, vol. 80, no. 6, 1994
"Method for Charpy pendulum impact test of metallic materials", JIS Z 2242, 2005
"Materia Japan", vol. 46, 2007, IRON AND STEEL INSTITUTE OF JAPAN, pages: 321
"Method for Charpy pendulum impact test of metallic materials", JIS Z 2242, 2005
"Materia Japan", vol. 46, 2007, IRON AND STEEL INSTITUTE OF JAPAN, pages: 321
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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