High strength Cr-Ni alloy material and seamless pipe for oil...

Details High strength Cr-Ni alloy material and seamless pipe for oil... High strength Cr-Ni alloy material and seamless pipe for oil...

2009-06-16

2011-12-06

Yee, Deborah (Department: 1733)

Alloys or metallic compositions

Containing over 50 per cent metal but no base metal

Iron containing

C420S040000, C420S049000, C420S052000, C420S053000, C148S327000, C148S442000, C148S909000

Reexamination Certificate

active

08071020

ABSTRACT:
A high strength Cr—Ni alloy material excellent in hot workability and stress corrosion cracking resistance, and seamless pipe for oil well application which consists of, by mass percent, C: 0.05% or less, Si: 0.05 to 1.0%, Mn: 0.01% or more and less than 3.0%, P: 0.05% or less, S: 0.005% or less, Cu: 0.01 to 4%, Ni: 25% or more and less than 35%, Cr: 20 to 30%, Mo: 0.01% or more and less than 4.0%, N: 0.10 to 0.30%, Al: 0.03 to 0.30%, O (oxygen): 0.01% or less, and REM (rare earth metal): 0.01 to 0.20% with the balance being Fe and impurities, and also satisfies the conditions in the following formula (1).in-line-formulae description="In-line Formulae" end="lead"?N×P/REM≦0.40  formula (1)in-line-formulae description="In-line Formulae" end="tail"?where P, N, and REM in the formula (1) respectively denote the contents (mass %) of P, N, and REM. The high strength Cr—Ni alloy material may further contain one or more types of W, Ti, Nb, Zr, V, Ca, and Mg, instead of part of Fe.

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