本文对国内某钢铁公司采用热连轧机和可逆轧机所生产的X70管线钢进行了工业对比试验。结果表明，热连轧管线钢具有更高的屈服强度、更细的显微组织及更好的DWTT性能，而可逆轧制管线钢则有更高的抗拉强度和低的屈强比。经研究认为，精轧过程中的道次间隔时间是造成力学性能差异的主要原因。
The industrial contrast experiment of X70 pipeline steel produced by hot tandem mill and reversing mill was carried out in a domestic certain iron and steel corporation. The results indicate that the pipeline steel produced by hot tandem mill possesses higher yield strength, finer microstructure and better DWTT property, and that produced by reversing mill possesses higher tensile strength and low yield-strength ratio. It can be concluded that the interval in pass during finish rolling is an important reason to affect the mechanical properties of X70 pipeline steel.
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