本文从实测钢管张力减径机各轧制力矩和轧辊转数入手,运用轧制理论推导出计算应力公式,用以确定钢管所受的拉应力数值并作为判断钢管拉断的依据。根据实测的过渡和稳定轧制力矩数值,验算出这两个样机的设备强度不足,发生设备事故是难免的。对该机组如何改造和同类机组设计提出了建议。 In this paper, starting from the measured rolling torque of steel pipe tension reducer and the number of roller rotation, the calculation formula of stress is deduced by using rolling theory to determine the value of tensile stress on steel pipe and serve as the basis for judging the steel pipe breaking. According to the measured values ​​of the transition and steady rolling torque, it is verified that the equipment strength of these two prototypes is insufficient and the equipment accident is inevitable. Proposed how to reconstruct the unit and design of similar units.