主要介绍在武钢CSP线上试制X70管线钢的化学成分设计和轧制工艺控制,并对试验钢的力学性能、金相组织及析出物等进行详细分析。试验结果表明,采用合适的控轧控冷工艺,可保证其力学性能达到设计要求。试验钢的显微组织为先共析铁素体+针状铁素体,平均晶粒尺寸细小,是X70管线钢的理想金相组织。 Mainly introduce the chemical composition design and rolling process control of X70 pipeline steel on WISCO CSP line, and analyze the mechanical properties, microstructure and precipitates of the test steel in detail. Test results show that the use of appropriate controlled rolling and controlled cooling process, to ensure its mechanical properties to meet the design requirements. The microstructure of test steel is pro-eutectoid ferrite + acicular ferrite, the average grain size is small, is the ideal microstructure of X70 pipeline steel.