In the current study, a three-dimensional semi-coupling macrosegregation model was established for a curved bloom continuous casting strand. The fluid flow, heat transfer, and solidification were calculated firstly with the effect of the mold electromagnetic stirring (M-EMS) and final electromagnetic stirring (F-EMS). Then, the transport of the solute was solved after the fluid flow reached a steady state. Predicted values of the magnetic induction intensity, temperature, and content of carbon agreed well with the measured ones, respectively. The negative segregation in the subsurface of the bloom was generated due to the rotational flow induced by M-EMS. The rotational flow pattern was formed along the cross section of the F-EMS zone. The maximum tangential velocity 0.012 m/s was located near the solidification front. The distribution of the carbon was uniform and the concentration of the carbon was about 0.205 pct in the molten steel. From the position 11.1 to 20.1 m beneath the meniscus, the liquid fraction at the centerline of the bloom decreased gradually to 50 pct and the concentration of carbon increased from 0.2 to 0.24 pct. The concentration of the carbon at the centerline of bloom increased sharply to 0.29 pct at the solidification end.

在目前的研究中，建立了弯曲大方坯连铸连铸坯的三维半耦合宏观偏析模型。首先在模具电磁搅拌（M-EMS）和最终电磁搅拌（F-EMS）的影响下计算流体流动、传热和凝固。然后，在流体流动达到稳定状态后解决溶质的输运问题。磁感应强度、温度和碳含量的预测值分别与实测值吻合。由于 M-EMS 引起的旋转流，在大方坯表面下产生了负偏析。沿 F-EMS 区域的横截面形成旋转流型。最大切向速度 0.012 m/s 位于凝固前沿附近。碳的分布是均匀的，碳在钢水中的浓度约为 0.205%。从弯液面下方 11.1 到 20.1 m 的位置，大花中心线处的液体分数逐渐减少到 50 pct，碳浓度从 0.2 增加到 0.24 pct。在凝固结束时，大花中心线处的碳浓度急剧增加至 0.29%。