热轧薄板钢焊接区组织与性能分析

Welding Zone Microstructure and Property Analysis of CSP Steel

采用包钢CSP（Compact Strip Production）薄板坯连铸连轧工艺生产L245钢为原料进行螺旋焊管焊接生产，针对生产中焊缝裂纹问题对焊缝区的形貌、组织进行了观察，并对焊缝进行拉伸性能和X射线检验。分析表明，母材与热影响区的交界处（即偏向热影响区的“过渡区”）是L245焊管力学性能最脆弱处，珠光体的形貌是影响其拉伸性能的关键因素。

Spiral welding zone microstructure, surface shape were observed , tensile property and X-ray detection were studied on the L245 steel slab which produced by CSP （Compact Strip Production）technology in Baotou Iron and Steel Co. , Ltd. The results show that the transition region is the most weakest in L245 steel weld zone, and the pearlite morphology is the main factor to tensile property.