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采用化学成分分析、金相检验和断口分析等方法,对304L钢D210塔筒体泄漏原因进行了分析。结果表明:D210塔筒体泄漏原因是由于氯离子的存在而产生应力腐蚀开裂所致。由于敏感材料、应力腐蚀环境及应力三个条件共同存在,在一定温度下使其产生应力腐蚀裂纹,裂纹起始于筒体外壁角焊缝处,而后向内壁扩展,最终穿透筒壁,致使该塔筒体在角焊缝处产生破裂泄漏。
The chemical composition analysis, metallographic examination and fracture analysis were used to analyze the causes of D210 tower cylinder leakage in 304L steel. The results show that the leakage of D210 tower is caused by stress corrosion cracking due to the presence of chloride ion. As the sensitive material, stress corrosion environment and stress coexist three conditions, at a certain temperature to produce stress corrosion cracking, crack initiation in the outer wall of the cylinder fillet weld, and then to the inner wall to expand, and eventually penetrate the cylinder wall, resulting in The tower barrel creates a rupture leak at the fillet weld.