| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel pipe for oil well having excellent pipe expandability in addition to excellent CO<SB>2</SB>corrosion resistance under a severe corrosive environment containing CO<SB>2</SB>, Cl<SP>-</SP>, etc. SOLUTION: The stainless steel pipe for oil well with excellent pipe expandability has a composition consisting of, by mass, 0.01 to 0.05% C,≤0.50% Si, 0.10 to 1.50% Mn,≤0.03% P,≤0.005% S, 12.0 to 17.0% Cr, 2.0 to 7.0% Ni,≤3.0% Mo,≤0.05% Al,≤0.20% V, 0.01 to 0.15% N and the balance Fe with inevitable impurities. Further, the steel pipe contains >20% austenite phase in a structure composed mainly of tempered martensite phase. COPYRIGHT: (C)2007,JPO&INPIT
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