为了解超（超）临界锅炉温度套管断裂原因，采用宏观检查、化学成分分析、金相检验、硬度测量、断口形貌 分析、ANSYS有限元分析，对断裂温度套管的失效原因进行了分析。结果表明，温度套管在交变应力作用下萌生疲劳裂 纹，并不断扩展，最终导致套管断裂。

 In order to understand the fracture reason of the temperature sleeve of the supercritical boiler, the failure reason of the temperature sleeve of the supercritical boiler was analyzed by means of macroscopic examination, chemical composition analysis, metallographic examination, hardness measurement, fracture morphology analysis and ANSYS finite element analysis. The results show that the fatigue crack of the temperature casing is initiated under the action of alternating stress, and the fatigue crack is extended continuously, which finally causes the casing fracture.