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A SEAMLESS STEEL TUBE FOR USE AS A STEEL CATENARY RISER IN THE TOUCH DOWN ZONE
A SEAMLESS STEEL TUBE FOR USE AS A STEEL CATENARY RISER IN THE TOUCH DOWN ZONE
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机译：无缝钢管，用作下垂区中的钢质悬垂管
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摘要
A seamless steel tube for a steel catenary riser with upsetends may be formed of a material including, in weight per cent:carbon 0.04-0.10; manganese 0.40-0.70; silicon 0.15-0.35;chromium 0.40-0.70; molybdenum 0.40-0.70; nickel 0.10-0.40;nitrogen 0.008;aluminum 0.010-0.045; sulfur = 0.005; phosphorus= 0.020; titanium 0.003-0.020; niobium 0.020-0.035; vanadium =0.10; copper = 0.20; and tin = 0.020. The material may have acarbon equivalent of 0.43 maximum, a composition parameter of nomore than 0.23, a yield strength of at least of 65000 psi, an ultimatetensile strength of at least 77000 psi, and a yield strength toultimate tensile strength ratio below 0.89. The material may have amicrostructure that is homogeneous at midwall and is mainly bainiteand at least one of acicular and non-polygonal ferrite.
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