Title:
STEEL PLATE HAVING EXCELLENT HYDROGEN-INDUCED-CRACKING RESISTANCE AND TOUGHNESS, AND STEEL TUBE FOR LINE PIPE
Document Type and Number:
WIPO Patent Application WO/2015/002046
Kind Code:
A1
Abstract:
The present invention provides a steel plate having demonstrably excellent hydrogen-induced-cracking resistance and toughness. The steel plate is characterized in including, in percent by mass, 0.02-0.15% of C, 0.02-0.50% of Si, 0.6-2.0% of Mn, more than 0% and up to 0.030% of P, more than 0% and up to 0.003% of S, 0.010-0.08% of Al, 0.0003-0.0060% of Ca, 0.001-0.01% of N, and more than 0% and no more than 0.0045% of O, the balance comprising iron and unavoidable impurities; the mass ratio of Ca to S (Ca/S) being at least 2.0; the amounts of Ca, S, and O satisfying the equation (Ca-1.25 S)/O≤1.80; and the Ar gas content of the steel being no greater than 0.5 µL/cm3.
Inventors:
KATO TAKU
KAWANO HARUYA
KAWANO HARUYA
Application Number:
PCT/JP2014/066852
Publication Date:
January 08, 2015
Filing Date:
June 25, 2014
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C22C38/06; C22C38/58; C21C7/00; C21C7/04; C21C7/10; C21D8/02
Foreign References:
| JP2010116611A | 2010-05-27 | |||
| JPH0941083A | 1997-02-10 | |||
| JP2008274355A | 2008-11-13 | |||
| JP2010209461A | 2010-09-24 | |||
| JPH06136440A | 1994-05-17 |
Other References:
See also references of EP 3018231A4
CAMP-ISIJ, vol. 24, 2011, pages 671
CAMP-ISIJ, vol. 24, 2011, pages 671
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)
Hisakazu Ueki (JP)
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