冷轧连续退火带钢表面麻点缺陷的形成原因与预防措施

针对冷轧连续退火带钢表面麻点缺陷,通过现场开炉检查,找出造成麻点缺陷的原因;通过对炉辊结瘤化学成分的检测,找出结瘤形成机制;结合连续退火机组的设备与工艺特点,提出合理、有效的预防炉辊结瘤措施。结果表明:退火炉内缓冷段炉辊存在严重的结瘤,是造成带钢表面麻点缺陷的主要原因。实际生产中,加强带钢的清洗效果,优化退火炉内区域的张力、控制退火炉内O₂含量及露点温度、降低炉辊粗糙度及合理安排生产作业计划,能有效控制退火炉内炉辊结瘤的发生。

Formation mechanism and preventive measures of pitting defects on surface of cold rolled continuous annealing strip steel

In view of the pitting defects on the surface of cold rolling continuous annealing strip, the causes of the pitting defects were found out through on-site open furnace inspection, the formation mechanism of the furnace roller nodules was found out by detection the chemical composition of the nodules, and reasonable and effective measures to prevent the furnace roller nodules were put forward based on the equipment and process characteristics of the continuous annealing unit. The results show that the serious roller nodules in the slow cooling section of the annealing furnace are the main cause of the pitting defects on the surface of the strip steel. In the actual production, the occurrence of furnace roller nodules can be effectively controlled by strengthening the cleaning effect of strip steel, optimizing the tension in the annealing furnace, controlling the O₂ content and dew point temperature in the annealing furnace, reducing the roughness of the furnace roller and arranging the production plan reasonably.