| 摘要 |
PURPOSE:To produce a high strength oil well pipe of superior stress corrosion cracking resistance by hot and cold working alloy steel cong. specific component compsn. of C, Si, Mn, P, S, Al, Ni, Cr, Mo, W under adequate conditions. CONSTITUTION:The alloy having the compsn. contg. <=0.05wt% C, <=1.0% Si, <=2.0% Mn, <=0.030% P, <=0.005% S, <=0.5% sol.Al, 30-60% Ni, 15-30% Cr, and further contg. 1 or 2 kinds of <=12% Mo and <=24% W, and consisting of the balance Fe and unavoidable impurities and satisfying the conditions of Cr%+10Mo%+5W%>=110%, 8%<=Mo%+0.5W%<=12% is hot worked under the conditions of >=10% thickness reduction ratio at <=1,000 deg.C and >=800 deg.C finishing temp., following to which it is cold worked at 10-60% thickness reduction ratio, whereby the desired oil well pipe is produced. |
