基于应变设计的X80M钢级Φ1219 mm×33 mm高应变管线钢管开发

Development of X80MΦ1219 mm×33 mm Pipelines with High Deformability Based on Strain Design

针对西气东输四线活动断裂带穿越工程管道,采用基于应变设计,以低C高Mn为基础,添加Nb、Cr、Ni、Mo、Ti、Cu等复合微合金元素进行合金体系设计和“多边形铁素体+贝氏体”的双相组织设计,并配合合理的TMCP轧制工艺,开发出了化学成分、力学性能稳定,屈强比低,均匀伸长率和应力比高,具有良好成型、焊接性能的X80M钢级厚度33 mm钢板,以及X80M钢级Φ1219 mm×33 mm高应变直缝埋弧焊管。结果表明,开发的高应变直缝埋弧焊管具有低屈强比、高应力比及高均匀塑性变形延伸率等良好的塑性和高应变能力,同时具有优良的低温韧性、安全性能和较高的现场适用性,达到了研制目标要求,为X80高应变管线钢管的管道工程批量化应用提供参考。

For the West-to-East China Gas Pipeline IV active fracture zone crossing engineering pipeline,strain based design was adopted,based on low C and high Mn,Nb,Cr,Ni,Mo,Ti,Cu and other composite microalloying elements were added to carry out alloy system design and biphase structure design of"polygonal ferrite+bainite",combined with reasonable TMCP production process,the X80M steel grade 33 mm thickness steel plate and the X80M steel gradeΦ1219 mm×33 mm high strain SAWL pipe have been developed with of stable chemical composition,low yield ratio,high stress ratio,high uniform elongation,and good formability and weldability.The results showed that the developed high deformability SAWL has good plasticity and high strain capacity,such as low yield ratio,high stress ratio and high uniform plastic deformation elongation,and has excellent low temperature toughness,high safety performance and field applicability,which meets the development objectives requirement.It provides references for mass application of X80 high strain pipeline pipe.