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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The master production scheduling(MPS) problem of hot rolling seamless steel tube is formulated as a mixed integer linear programming model.

建立了热轧无缝钢管主生产计划问题的混合整数线性规划模型。

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The wall thickness tolerance of hot-rolled seamless steel tubes is a major issue which has to be addressed in case of operation of any newly-built or modified hot-rolling tube mill.

如何获得更高的热轧无缝钢管的尺寸精度是新建或改造轧管机组重点考虑的问题。

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