| 摘要 |
PROBLEM TO BE SOLVED: To provide a martensitic stainless steel for an oil well, which has adequate SSC resistance under coexistence of Cl<SP>-</SP>, wet CO<SB>2</SB>and a very small amount of H<SB>2</SB>S, and has superior low-temperature toughness as well. SOLUTION: The martensitic stainless steel for the oil well comprises 0.16-0.22% C, 0.1-0.8% Si, 0.25-1.00% Mn, 0.025% or less P, 0.010% or less S, 12.0-13.5% Cr, 0.010% or less Al, 0-0.2% Ni, 0-0.10% Cu, 0-0.20% Mo, 0-0.050% Ti, 0.01-0.1% N, and the balance Fe with impurities. The steel may include a specific amount of one or more elements of Nb and V and/or one or more elements among Ca, Mg, La and Ce. COPYRIGHT: (C)2007,JPO&INPIT
|
