| 摘要 |
PURPOSE:To obtain a martensitic stainless steel for a pipe for an oil well having superior resistance to corrosion and stress corrosion cracking by adding specified amounts of C, Si, Mn, S, Cr, Ni and Mo to Fe. CONSTITUTION:The composition of a martensitic stainless steel for a pipe for an oil well is composed of, by weight, <0.02% C, <0.5% Si, 0.5-1.5% Mn, <0.005% S, 12-15% Cr, 3.5-6% Ni, 0.5-3% Mo and the balance Fe with inevitable impurities. The steel is formed into a seamless pipe or an electric welded pipe in conventional manufacturing stages, and the pipe is heated to 900- 1,100 deg.C, cooled by water or air cooling, and tempered at 600-800 deg.C to obtain a pipe for an oil well.
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