Process for producing bent pipe for line pipe

Details Process for producing bent pipe for line pipe Process for producing bent pipe for line pipe

2009-09-23

2011-10-18

Ward, Jessica L (Department: 1735)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S325000

Reexamination Certificate

active

08038811

ABSTRACT:
A steel pipe is prepared, which contains, by mass, at most 0.009% C, at most 1.0% Mn, at most 1.0% Si, at most 0.04% P, at most 0.005% S, 0.01 to 0.2% Ti, 0.01 to 0.10% V, 0.001 to 0.1% Al, at most 0.1% N, 4.0 to 8.0% Ni, 9.0 to 15.0% Cr, and 1.5 to 7.0% Mo, the balance being Fe and impurities. The prepared steel pipe is bent into a bend pipe. The bend pipe is quenched at a quenching temperature lower than 950° C. The quenched bend pipe is tempered. Accordingly, the bend pipe in accordance with the present invention has excellent SSC resistance.

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