锅炉炉管开裂泄漏原因分析

通过宏观观察、能谱分析化学成分、金相组织和扫描电镜分析等方法。对某热电厂蒸汽锅炉炉管开裂问题进行研究。结果表明:焊接温度使炉管表面的组织发生了改变,屈氏体使炉管脆化,塑性和韧性降低,变形能力变差。焊接收缩拉应力和其它应力是炉管产生开裂及裂纹扩展的主要原因。

Cause Analysis of Boiler Tube Cracking and Leakage

The steam boiler tube cracking problem in a power plant was analyzed by macro observation, chemical composition analysis, optical and electron microstructure observation, energy dispersive X-ray spectroscopy （EDS） analysis and scanning electron microscopy analysis. The results showed that： the tissue of furnace tube surface was changed by welding process, the formation of troostite embrittled the furnace tube, lowered its ductility and toughness to deteriorate the deformation capacity; Weld shrinkage tensile stress and other stress were the main reasons for tube cracking and cracks propagation.