A 3D/2D hybrid multi-physical-field mathematical model, which takes into consideration the thermosolutal buoyance, was developed to predict the macrosegregation of gear steel 20CrMnTi continuously cast by a curved billet caster with size of 160 mm × 160 mm, and investigated the effect of final electromagnetic stirring (F-EMS) on the fluid flow, heat transfer and solute distribution in the liquid core of continuously cast steel. The results show that the application of F-EMS eliminates the effect of thermosolutal buoyancy on the asymmetric distribution of carbon concentration in the cross section of billet and accelerates the final solidification of resident molten steel in the liquid core of strand, but promotes the negative carbon segregation near the billet center. When the gear steel 20CrMnTi is cast at the temperature of 1803 K and speed of 1.7 m/min, the solidification end advances forward from 9.84 to 9.72 m, and center carbon segregation ratio of billet decreases from 1.24 to 1.17 with the increase in current density of F-EMS from 0 to 350 A.

建立了考虑热溶质浮力的3D / 2D混合多物理场数学模型，以预测尺寸为160 mm×160 mm的弧形连铸机连续铸造的20CrMnTi齿轮钢的宏观偏析，并研究了电磁搅拌（F-EMS）对连铸钢液芯中流体流动，传热和溶质分布的影响。结果表明，F-EMS的应用消除了热溶质浮力对钢坯横截面碳浓度不对称分布的影响，并加速了钢绞线液芯中残留钢水的最终凝固，但促进了负碳。在钢坯中心附近偏析。当齿轮钢20CrMnTi以1803 K的温度和1的速度铸造时。