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对双排多辊式轧机冷轧钢管的变形过程进行了详细的分析研究，推导出一个轧制周期内延伸系数的计算公式。
The deformation process of the cold-rolled steel tube of the double-row multi-roll mill is analyzed and studied in detail, and a formula for calculating the extension coefficient in the rolling cycle is deduced.