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Application filed by Sumitomo Metal IndfiledCriticalSumitomo Metal Ind
Publication of MX2008002531ApublicationCriticalpatent/MX2008002531A/en
Disclosed is a seamless steel pipe for line pipes which is suitable for flowlines or risers since it has high strength, excellent toughness and good corrosion resistance even when it is formed thick. This seamless steel pipe for line pipes has a chemical composition consisting of, in mass%, 0.02-0.08% of C, not more than 0.5% of Si, 1.5-3.0% of Mn, 0.001-0.10% of Al, more than 0.4% and not more than 1.2% of Mo, 0.002-0.015% of N, 0.0002-0.007% of Ca and one or two of REM in total, and the balance of Fe and impurities. In the impurities, P is not more than 0.05%, S is not more than 0.005%, and O is not more than 0.005%. The seamless steel pipe for line pipes satisfies the following formula: 0.8 a??ñ [Mn] ??[Mo] a??ñ 2.6 (wherein [Mn] and [Mo] represent values equivalent to respective contents of Mn and Mo in mass%).
MX2008002531A2005-08-222006-08-22Seamless steel pipe for line pipe and method for producing same.
MX2008002531A
(en)
Steel for high-strength components comprising bands, sheets or tubes having excellent formability and particular suitability for high-temperature coating processes
Steel sheet for deep drawing having excellent secondary work embrittlement resistance, fatigue properties and plating properties, and method for manufacturing the same