低碳钢制管开裂原因分析及工艺改进措施

Low Carbon Steel Pipe Crack Reason Analysis and Process Improvement Measures

材质为Q235B的低碳钢热轧板制管焊接后出现严重的开裂现象，通过化学成分分析、机械性能检测、金相分析以及扫描电镜分析，明确其开裂原因为钢板塑性低导致。对钢板进行热处理试验确定最佳的热处理温度，最终确定热轧板卷取温度在620℃～680℃时可获得良好的综合性能。

Some companies use the material for hot strip rolling Q235B welding after severe transverse cracks, by chemical composition analysis, mechanical properties testing, metallographic analysis, SEM analysis. The results show that low plasticity is main reason caused welded pipe transverse defects of steel plate. The plate was carried out to determine the optimum temperature of the heat treatment heat treatment test, and ultimately determine the hot-rolled plate coiling temperature at 620℃-680℃can obtain good comprehensive properties.