Highly tough ERW steel pipe with distinguished sour resistance

Details Highly tough ERW steel pipe with distinguished sour resistance Highly tough ERW steel pipe with distinguished sour resistance

1987-11-24

1989-02-14

Yee, Deborah

Pipes and tubular conduits

Longitudinally seamed

Permanent type seam

138177, 148909, 148332, 148333, 148334, 148335, 148320, F16L 902

Patent

active

048040215

ABSTRACT:
A highly tough, ERW steel pipe having a distinguished sour resistance is disclosed. The steel pipe is prepared from steel for production of ERW steel pipe containing 0.01 to 0.35% by weight of C; 0.02 to 0.5% by weight of Si; 0.1 to 1.8% by weight of Mn; more than 0.005% to 0.05% by weight of Al; 0.0005 to 0.008% by weight of Ca; 0.001 to 0.015% by weight of Zr; not more than 0.015% by weight of P; and not more than 0.003% by weight of S; a ratio of Zr/Al or (Ti+Zr)/Al being less than 2 by weight; or further containing (A) at least one of 0.2 to 0.6% by weight of Cu, 0.1 to 1.0% by weight of Ni and 0.2 to 3.0% by weight of Cr, and/or (B) at least one of 0.10 to 1.0% by weight of Mo, 0.01 to 0.15% by weight of Nb, 0.005 to 0.10% by weight of Ti and 0.01 to 0.15% by weight of V; the balance being Fe and impurities as a steel material; and the steel pipe has a welding part in which the content of Al.sub.2 O.sub.3 contained in inclusions at welding heat affected zone is not more than 50% by weight.

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