Abstract: Taking the No.1 continuous caster of Chongqing Iron and Steel Co. as object, water model experiments were conducted to simulate the continuous grade transition casting process. The dimensionless concentration profiles along slab length with different continuous casting conditions were measured. The results show that increasing molten steel flow rate and reducing molten steel level in the tundish can both reduce the intermixing slab. In the ranges of molten steel flow rate and level in Chongqing Iron and Steel Co., the flow rate will make a 21% difference from dimensionless concentration at the same time, the molten steel level will make a 73% difference from dimensionless concentration at the same time. This proves that the molten steel level has a more significant impact on dimensionless concentration. Based on the profiles, a model was developed to predict the length and location of intermixing slab and make the model exactly by sampling. Comparison of predicted dimensionless concentration profile with plant data shows that the precision of the model can reach 95%, it is higher than the similar results in other literature.

Key words: continuous grade transition casting, location of intermixing slab, prediction model, water model

摘要： 以重钢1#板坯连铸机为对象，通过水力学物理模拟研究了通钢量和中间包余钢量与铸坯长度方向无量纲浓度的关系. 结果表明，增大通钢量和降低余钢量都会减小交接坯长度，在重钢浇注条件允许的最大通钢量及余钢量变化范围内，通钢量对同一时刻无量纲浓度影响的最大差为21%，余钢量不同产生的最大差为73%，说明余钢量对交接坯长度影响更显著. 在水模实验基础上通过数学回归和插值法，建立了异钢种连浇过程铸坯交接坯位置和长度的预测模型，并通过实际交接坯取样分析对模型进行了修正. 修正模型预测结果与现场取样结果比较，预测精度达95%，高于相关文献水平.

关键词: 异钢种连浇, 交接坯位置, 预测模型, 水模型