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采用2种J55级钢带(A钢带:高含量碳锰;B钢带:低含量碳锰)对高频焊接(HFW)油管进行了试制,并通过光学显微镜、力学分析等方法研究了钢带的成分和性能对最终管体性能的影响。研究结果表明,钢带中高含量C和Mn元素使A钢带屈服强度升高,制管过程中由于加工硬化的影响,进一步增加了钢管的力学性能,因此由A钢带试制的HFW油管(A钢管)屈服强度超标,同时高含量C、Mn元素导致焊缝质量降低。采用适当降低C、Mn等强化元素的钢带试制的HFW油管质量良好,性能完全符合API SPEC 5CT规范要求。
High-frequency welding (HFW) tubing was trial-produced with two types of J55 steel belting (A steel strip: high content of carbon and manganese; B strip: low content of carbon and manganese), and the microstructure of the steel was studied by optical microscope and mechanical analysis. Effect of composition and properties of the tape on the performance of the final tube. The results show that the high content of C and Mn in the steel strip causes the yield strength of A steel to increase, and the mechanical properties of the steel pipe further increase due to work hardening in the pipe making process. Therefore, the HFW tubing (A Steel) yield strength exceeded, while high levels of C, Mn lead to reduced weld quality. The HFW tubing made with a strip of steel with the appropriate reduction of C, Mn and other strengthening elements is of good quality and fully complies with API SPEC 5CT specifications.