High-strength steel pipe of API X65 grade or higher

Details High-strength steel pipe of API X65 grade or higher High-strength steel pipe of API X65 grade or higher

2011-06-14

2011-06-14

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S333000, C148S334000, C148S335000, C148S336000, C148S332000, C148S909000

Reexamination Certificate

active

07959745

ABSTRACT:
A high-strength steel pipe having a strength of API X65 grade or higher consisting essentially of, by mass %, 0.02 to 0.08% of C, 0.01 to 0.5% of Si, 0.5 to 1.8% of Mn, 0.01% or less of P, 0.002% or less of S, 0.01 to 0.7% of Al, 0.005 to 0.04% of Ti, 0.05 to 0.50% Mo, at least one element selected from 0.005 to 0.05% of Nb and 0.005 to 0.10% of V, and the balance being Fe, in which the volume percentage of the ferritic phase is 90% or higher, and complex carbides containing Ti, Mo, and at least one element selected from the group consisting of Nb and V are precipitated in the ferritic phase. The high-strength steel pipe has excellent HIC resistance and good toughness of a heat-affected zone, and can be manufactured stably at a low cost.

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Machine-English translation of Japanese patent 05-255745, Toyoda Kazuomi et al., May 5, 1993.

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