By means of macro-examine, optical microscope, EDX, X-ray diffraction and chemical experiment,the conclusion is drawn that tube thickness thinning is caused by severe sulfidation. Causes of corrosion are also discussed.

• 通过宏观、金相显微镜、能谱分析、X射线衍射检测分析以及化学实验等方法，得出了管壁减簿是发生了严重的硫化物型腐蚀的结论，并分析了腐蚀原因。