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针对亚包晶钢板坯连铸结晶器内经常出现的严重液面波动问题,从机制认识出发,进行了工艺试验研究。指出液面驻波和二冷区坯壳的非稳定鼓肚是导致结晶器液面波动的主要因素。通过调整亚包晶钢的化学成分,使其碳含量与实际包晶点的计算值接近,并适度增加二冷前区的冷却强度,可有效抑制液面波动。结果表明,亚包晶钢连铸突出的液面波动是因为其不均匀坯壳生长所造成的非稳定鼓肚。亚包晶钢实际碳含量距包晶点越近,相变收缩比例越小,坯壳厚度不均匀度以及后续坯壳非稳定鼓肚量的变化也将越小,有助于减小液面波动程度。
Aiming at the severe liquid level fluctuation frequently occurring in the sub-amentic steel slab continuous casting mold, the technological experiment is carried out based on the understanding of the mechanism. It is pointed out that the unsteady bulging of liquid surface standing wave and secondary cooling zone shell is the main factor leading to the fluctuation of liquid level of mold. By adjusting the chemical composition of the sub-peritectic steel, the carbon content of the sub-peritectic steel is close to the calculated value of the actual inclusion point and the cooling intensity of the pre-cooling zone is modestly increased, which can effectively suppress the fluctuation of the liquid level. The results show that the prominent liquid level fluctuation in sub-amentite continuous casting is due to the instability bulging caused by the uneven shell growth. The actual carbon content of sub-peritectic steel closer to the peritectic point, the smaller the phase change shrinkage ratio, the variation of the thickness of the shell and the amount of the unsteady bulging of the subsequent shell will be smaller, which helps to reduce the liquid level fluctuation degree.