The length, diameter and using time of mandril are needed in the process of manufacturing the pipe.
在扩管生产中，需要实时了解每根顶杆的长度、外径、使用次数等信息。
The axial stress on the steel tube which appears on the contact region of the steel tube and mandril is larger than the radial and circumferential stress.
钢管周向和径向的应力值不大，而轴向应力值较大，最大轴向应力出现在钢管与芯模的接触部位。
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。
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。
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