采用宏观形貌观察、化学成分分析、金相组织观察、扫描电镜分析及硬度检验等方法，对某炼油厂脱硫装置再生塔顶冷却器内浮头螺栓断裂原因进行分析.结果表明，该螺栓的化学成分、金相组织正常；硬度为HRC34.5；其断裂原因是环境中的湿硫化氢应力腐蚀所致.并提出了相应的改进建议.
Analysis of the failed float head bolts used for a cooler in desulfurizing unit was conducted by visual inspection，chemical composition analysis，metallographic examination，SEM observation and hardness test.The results showed that the microstructure and chemical composition of these bolts were in accord with the relevant standard，and hardness was HRC34.5.The failure was caused by wet H2S induced stresscorrosion.The logical safety countermeasure was proposed.
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