The test result shows that the subtempera- ture quench process enables the said casing to have satisfactory comprehensive mechanical properties and meet rele- vant requirements for the N80 steel grade as specified in API Spec. 5CT.

• 试验结果表明,合理的亚温淬火工艺可以获得综合力学性能良好的石油套管,并且完全满足美国APISpec5CT标准中规定的N80钢级性能要求。