Title:
HIGH-STRENGTH STEEL SHEET AND HIGH-STRENGTH STEEL PIPE HAVING EXCELLENT HYDROGEN-INDUCED CRACKING RESISTANCE FOR USE IN LINE PIPE
Document Type and Number:
WIPO Patent Application WO/2010/093053
Kind Code:
A1
Abstract:
Provided are a steel sheet and a steel pipe having excellent HIC resistance that are ideal for, for instance, a line pipe used to convey petroleum or natural gas. The steel sheet and the steel pipe are formed from steel having a steel composition that comprises C: 0.02-0.08%, Si: 0.01-0.5%, Mn: 1.0-1.6%, Nb: 0.001-0.10%, N: 0.0010-0.0050%, Ca: 0.0001-0.0050%, P: 0.01% or less, S: 0.0020% or less, Ti: 0.030% or less, Al: 0.030% or less, and O: 0.0035% or less and that satisfies S/Ca < 0.5, and having a maximum Mn degree of segregation of 2.0 or less, a maximum Nb degree of segregation of 4.0 or less, and a maximum Ti degree of segregation of 4.0 or less.
Inventors:
HARA TAKUYA (JP)
TERADA YOSHIO (JP)
MURAKI TARO (JP)
SUZUKI GO (JP)
TERADA YOSHIO (JP)
MURAKI TARO (JP)
SUZUKI GO (JP)
Application Number:
PCT/JP2010/052395
Publication Date:
August 19, 2010
Filing Date:
February 10, 2010
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
HARA TAKUYA (JP)
TERADA YOSHIO (JP)
MURAKI TARO (JP)
SUZUKI GO (JP)
HARA TAKUYA (JP)
TERADA YOSHIO (JP)
MURAKI TARO (JP)
SUZUKI GO (JP)
International Classes:
C22C38/00; C22C38/14; C22C38/58
Foreign References:
| JP2006063351A | 2006-03-09 | |||
| JPH06256894A | 1994-09-13 | |||
| JPH06220577A | 1994-08-09 | |||
| JP2007136496A | 2007-06-07 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Atsushi Aoki (JP)
Atsushi Aoki (JP)
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