在对溶质再分配机制进行热力学分析的基础上，建立了描述板坯中心偏析的模型——“溶质析出量”模型，并对模拟结果进行了分析。结果表明：溶质再分配过程中溶质析出的根本原因是存在化学位梯度；对于Q235B钢种，中心线处碳溶质浓度在凝固末端出现突增，最大值0.76%，拉速从1.2 m/min变化至1.6 m/min时，最大偏析度从5.057增加到5.103。
On the basis of the thermodynamic analysis of solute redistribution, a slab central segregation model was established, which is called “solute precipitation quantity” model, and the simulation result was analyzed. The results show that, the origin of solute precipitation during the solute redistribution process is the existence of chemical potential gradient; the carbon concentration of Q235B slab central line increases suddenly to maximum 0.76% at the end of solidification; once the casting speed changes from 1.2 m/min to 1.6 m/min, the maximum segregation degree will increase from 5.057 to 5.103.
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