优化冷却工艺降低含钛焊丝盘条同圈强度差

Improving cooling process to reduce same circle strength difference of titanium welding wire rod

企业生产的BZJ60-Ti含钛焊丝盘条同圈抗拉强度差大于160 MPa,用户在免退火拉拔过程中出现频繁断丝。根据BZJ60-Ti动态冷却曲线,并结合斯太尔摩风冷线较短的实际情况,轧制BZJ60-Ti钢时采用(780±20)℃的吐丝温度,辊道速度0.12 m/s,轧制速度为88 m/s的控轧控冷工艺,盘条通条抗拉强度差为28~80 MPa,满足下游用户免退火使用要求。

The same circle tensile strength difference of BZJ60-Ti welding wire steel produced is more than 160 MPa,wire broken occurs frequently in process of customers wire drawing without annealing.According to BZJ60-Ti dynamic cooling curve,and combining actual situation of Stelmor cooling line short,the control rolling and control cooling process such as wire rod laying temperature （780 ±20） ℃,roller speed 0.12 m/s,rolling speed 88 m/s is adopted in rolling BZJ60-Ti steel,wire rod same circle tensile strength difference is 28 -80 MPa,which meet customer using requirement without annealing.