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通过宏观检查、化学成分分析、金相检验及硬度试验等方法,对某厂超超临界锅炉后屏过热器Super304H管爆管原因进行了分析。结果表明:爆管是由于长时过热导致管子显微组织老化、损伤所致。
The causes of tube explosion of super304H tube of rear screen superheater in a supercritical boiler of a factory were analyzed by macroscopic examination, chemical composition analysis, metallographic examination and hardness test. The result shows that the squib is caused by the aging and damage of the microstructure of the pipe due to prolonged overheating.