Title:
ULTRAHIGH-TENSILE-STRENGTH STEEL PLATE FOR WELDING
Document Type and Number:
WIPO Patent Application WO/2014/199488
Kind Code:
A1
Abstract:
This steel plate has a chemical composition that contains, in terms of mass%, 0.015-0.045% C, 1.80-2.20% Mn, 0.40-0.70% Cu, 0.80-1.80% Ni, 0.005-0.015% Nb, 0.05-0.25% Mo, 0.005-0.015% Ti, 0.0004-0.0020% B, 0.0020-0.0060% N, and 0.0015-0.0035% O. In the plate-thickness-direction central part of a thickness-direction cross-section of the steel plate, the number of oxide grains having an equivalent-circle diameter of 2 μm or larger is 20 or less per mm2 and the number of Ti oxide grains having an equivalent-circle diameter of 0.05-0.5 μm is 1.0×103-1.0×105 per mm2.
Inventors:
WATANABE YOSHIYUKI (JP)
HARA TAKUYA (JP)
FUJIOKA MASAAKI (JP)
HARA TAKUYA (JP)
FUJIOKA MASAAKI (JP)
Application Number:
PCT/JP2013/066349
Publication Date:
December 18, 2014
Filing Date:
June 13, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/58; B22D11/22; C21D8/02
Domestic Patent References:
| WO2013077022A1 | 2013-05-30 |
Foreign References:
| JP2004100037A | 2004-04-02 | |||
| JP2006124759A | 2006-05-18 | |||
| JP2011001625A | 2011-01-06 |
Other References:
See also references of EP 2843073A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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