通过宏观分析、化学成分分析、硬度检验、金相组织检验和扫描电镜断口分析,对某发电公司电站锅炉汽包安全阀弹簧断裂失效原因进行了综合分析。结果表明,该弹簧的断裂是由于选材不当、热处理过程中工艺不正确导致材料出现脆性断裂,运行过程中弹簧着水后出现的氧腐蚀坑对开裂起到了促进作用。 Through the macroscopical analysis, the chemical composition analysis, the hardness test, the metallographic examination and the scanning electron microscopy fracture analysis, this paper analyzes the causes of failure failure of spring rupture of steam drum safety valve of a power station boiler. The results show that the fracture of the spring is due to improper material selection, brittle fracture of the material caused by improper process during the heat treatment, and the oxygen corrosion pits appearing after the spring flooding the water during the operation, which promotes the cracking.