Abstract: During the process of seamless steel tube manufacturing, after the operation steps namely, drawing, heat treatment and cooling, the product normally becomes bent. In case the bent is beyond a normal range, it will be hard for the tube to get through the 7-high straightener, influencing the normal cycle of the production negatively. Addressing this problem, a pneumatically-operated pipe pre-straightening aggregate is designed and installed by and located at the Steel Tube Plant, Xinyu Xingang Specialty Steel Co., Ltd. Actual operation result shows that the said pre-straightening machine is capable of meeting the production demand, having the productivity of the individual operation line increased by over 12%.