包钢CSP热轧卷板纵裂缺陷分析与控制

为了研究薄板厂CSP产线热轧卷板纵裂缺陷产生原因,对连铸工艺及设备各运行参数进行了调查分析。结果表明,连铸机振动台振动精度差、结晶器铜板结垢是导致热轧卷纵裂缺陷的主要原因。采取调整振动参数、提升振动台对中精度以及控制铜板结垢等措施后,热轧卷板表面纵裂纹缺陷显著降低,纵裂率由最高的1.15%降至0.10%以下。针对CSP铸机,在保证结晶器铜板导热良好的前提下,需严格控制结晶器振动台四连杆机构的关节轴承间隙在0.02 mm以内,振动台台面标高偏差在0.05 mm之内。结晶器振动在水平方向的位移量在0.1 mm以内为宜。

Analysis and control of longitudinal crack on hot rolled coil in CSP plant of Baotou Steel

In order to study the cause of longitudinal crack defect of hot rolled coil in CSP production line of thin plate factory, continuous casting process and operating parameters of equipment were investigated and analyzed. The results show that the poor vibration accuracy of vibrating table of continuous casting machine and scaling of the copper plate in the mould are the main reasons for the longitudinal crack of hot rolling.After adjusting the vibration parameters, improving the alignment accuracy of the shaking table and controlling the scale formation of the copper plate, the longitudinal crack defect on the surface of the hot rolled coil plate was reduced, and the longitudinal crack rate decreased from the highest 1.15% to less than 0.10%.In view of CSP casting machine, on the premise of ensuring good thermal conductivity of the mould copper plate, the joint bearing clearance of the four-link mechanism of the mould vibrator should be strictly controlled within 0.02 mm.Elevation deviation of shaking table should be strictly controlled within 0.05 mm.Horizontal displacement of mould vibration is suggested to be controlled within 0.1 mm.