为了准确估算API X70和X80管线钢管的屈服强度,分别对API X70和X80管线钢板和钢管进行了制管和压平过程的双循环模拟试验,并将包申格应力参数和Swift方程相结合来估算钢管的屈服强度。试验和估算结果表明,包申格应力参数和Swift方程相结合的估算方法中已经包含了显微组织和制管过程的影响因子,因而能较为准确地估算钢管的屈服强度。因拉压强度差效应较小且和反向流动曲线可用一条曲线表示,因此利用展平钢板的拉伸/压缩性能可有效估算制管前后屈服强度的变化,该估算方法对控制显微组织和制造工艺参数进而控制管线钢板的屈服强度有着重要的作用。 In order to accurately estimate the yield strength of API X70 and X80 pipeline steel pipes, two-cycle simulation experiments of pipe-making and flattening of API X70 and X80 pipeline steel sheets and steel pipes were respectively carried out. The combination of Bauschinger stress parameters and Swift equation Estimate the yield strength of the steel pipe. The experimental results show that the method of combining Bauschinger stress with Swift equation contains the influence factors of microstructure and pipe making process, so that the yield strength of steel pipe can be accurately estimated. Because of the small differential pressure effect and the reverse flow curve can be expressed by a curve, so the use of flattening steel tensile / compressive properties can be effectively estimated before and after the tube yield strength change, the estimation of the control of microstructure and Manufacturing process parameters which in turn control the yield strength of pipeline steel plays an important role.