| 摘要 |
PURPOSE:To manufacture an oil well pipe combining SSC resistance with collapse resistance under a sour environment, by subjecting a seamless steel tube or resistance welded tube to quench-and-temper treatment and then to cold straightening and heat treatment or to warm straightening. CONSTITUTION:An oil well pipe stock of seamless steel tube or resistance welded pipe is subjected to quench-and-temper treatment and is then subjected to straightening at <=5% draft and to heat treatment at 200-500 deg.C, or, in place of cold straightening and heat treatment, to warm straightening at 200-500 deg.C. By this above treatments, a high yielding ratio secured by means of quench-and temper treatment can be improved to a greater extent, and the high-collapse oil well tube having sour resistance in which SSC resistance is united with collapse resistance at a high level can be obtained.
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