某热电厂的过热器15CrMo钢管道仅运行3000 h就发生爆管事故,宏观检查显示,管材内壁发生严重的氧化腐蚀。利用SEM、EDS和XRD等方法,测试分析了15CrMo钢管不同位置的组织结构及氧化层的物相组成等。结果表明,钢管在服役过程中有严重的氧化腐蚀,形成内外两层氧化皮,氧化侵蚀主要先从晶界开始,再逐步扩展到晶内。 A thermal power plant superheater 15CrMo steel pipe burst pipe explosion occurred only 3000 h operation, the macro examination showed that the pipe wall serious oxidative corrosion. SEM, EDS and XRD methods were used to analyze and analyze the microstructures and oxide phases of 15CrMo steel tubes. The results show that the steel tube has serious oxidation corrosion during service, forming the inner and outer two layers of scale. The oxidative erosion mainly begins with the grain boundary and then expands into the crystal.