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对TMCP工艺制X90M管线钢管经直缝埋弧焊JCOE成型工艺制管前后力学性能变化进行分析,由于制管及焊接过程中产生应力,制管后管体强度及屈强比较制管前有所增大。因此在钢板热机轧制过程中要严格控制屈强比。其次制管后管体冲击功数值和母材相差不大,但焊缝和热影响区在同一温度下的冲击功均明显低于母材,这是由于焊后焊缝和热影响区的晶粒较母材来说较为粗大且这种钢种未经热处理导致。
The TMCP process X90M pipeline steel pipe through the longitudinal seam submerged arc welding JCOE molding process before and after the pipe mechanical properties analysis, due to stress during the pipe and welding process, the pipe after the tube body strength and yield strength compared before the tube Increase. Therefore, the hot plate rolling process to strictly control the yield ratio. Secondly, the impact energy value of the pipe body after the pipe production is similar to that of the base metal, but the impact energy of the weld and the heat affected zone at the same temperature is obviously lower than that of the base metal, which is due to the post weld bead and heat affected zone crystal The grains are thicker than the parent material and the steel is not heat treated.