热轧带钢表面氧化铁皮压入缺陷预防与控制

Prevention and control measures of scale pressed defects on the surface of hot rolled strip

针对首钢迁钢2 160mm生产线轧制冷轧基料时带钢表面氧化铁皮压入缺陷问题,对生产工艺设备进行了系统分析与研究。结果表明:该缺陷的产生与板坯出炉温度、轧辊氧化膜剥落、高压水除鳞、轧机共振、机架间冷却、辊缝水等众多因素相关。为此,通过采用降低板坯出炉温度、后移RT2高温计、优化精轧机负荷分配、抑制轧机共振、优化使用机架间冷却水与辊缝水、优化轧辊冷却水及高压水喷嘴布置等多项措施,有效减少了带钢表面氧化铁皮压入缺陷,提高了带钢表面质量。

In view of the scale pressed defects on the surface of hot roiled strip for cold rolling, the production process and equipment were analyzed. The results showed that the defects were affected by slab tapping temperature,roll film spalling,high pres sure water descaling,mill resonance, interstand cooling water, and other related factors of the roll surface anti-peeling devices. Therefore, some control measures were applied, including decreasing the slab tapping temperature, optimizing the load distribution of finishing mill, inhibiting rolling mill resonance, optimizing usage of interstand cooling water and the anti--peeling water, optimizing the work roll cooling nozzle and high pressure water nozzle arrangement, etc. Based on these measures, the defects were ef fectively reduced, and the surface quality of hot roiled strip was improved.