Scanning Electronic Microscope(SEM)and EDAX were used to analyze the surface defect of mandril for hot rolling steel tube.Appearance and growth of the surface defect were investigated and discussed.

• 采用扫描电镜及能谱分析对热轧管用失效芯棒的表面缺陷进行分析,探讨了芯棒表面缺陷的产生原因和长大机理。