某国产火焰锅炉投产运行一个月后，屏式过热器管发生爆管泄漏。通过宏观检验、化学成分分析、硬度测试、金相检验、扫描电镜及能谱分析等方法对过热器管发生爆管的原因进行了分析。结果表明：爆管为长时间超温运行所致，过热器管接头环焊缝内部的焊瘤阻碍了蒸汽流动，同时氧化皮影响了热量传递，导致管壁局部长时间过热；爆口处显微组织严重老化，且有明显蠕变损伤，降低了管材的强度，管壁承压能力下降，最终导致爆管泄漏。

The platen superheater tube of a domestic flame boiler burst and leaked after one month operation. The burst causes of superheater tube were analyzed by means of macroscopic examination, chemical composition analysis, hardness test, metallographic examination, scanning electron microscope and energy spectrum analysis. The results show that long-time over temperature operation caused tube burst. Weld beadings inside the girth weld of superheater tube joint blocked the steam flow, and oxide skin impacted heat transfer, which caused partial wall overheating for a long time. Serious aging of microstructure and obvious creep damage of burst mouth reduced the strength of tube material, and the pressure bearing capacity of tube wall and finally led to burst and leakage of superheater tube.