Speaker
Description
Continuous casting of thin steel slabs is a cutting-edge technology in iron and steel industry. Electromagnetic Braking (EMBr) technique is widely implemented into thin slab casters to reduce defects caused by strong turbulence in the mold. A slab-casting Strand Electromagnetic Stirring (SEMS) system was developed to control heat transfer in the strand. Sophisticated phenomena, including turbulent flow, heat transfer, electromagnetic effects, and solidification in the mold were solved using numerical methods. Electromagnetic fields with the simultaneous work of EMBr and SEMS were calculated based on finite-element method. Large eddy simulation was used to predict the transient flow. An enthalpy-porosity method was selected to predict the solid shell distribution. Furthermore, special boundary conditions were considered in the present model as the special shape of the mold. It is demonstrated that SEMS has a great effect on the distribution of solid shell and undercooling in the melt. And the mushy zone thickness nearby the SEMS becomes thinner. In addition, the SEMS used in this work will affect the velocity of slag-melt interface which can be observed in situ. Further work is needed to do to predict the equiaxed crystal ratio in the slab with the effect of electromagnetic manipulation.