Numerical Simulation Study On Coupled Electromagnetic Field, Flow Field And Heat Transfer In Round Billet Continuous Casting With Electromagnetic Stirring

In molten steelmaking process, the mold is the last metallurgical unit that significantlydetermines the quality of continuous casting products, which is improved effectively by thetechnology of M-EMS used in some steel enterprise to get the high quality products. Therefore, itis necessary to carry out the coupled simulation study for electromagnetic field, flow field andheat transfer in the mold.Aiming at the M-EMS for37Mn5steel φ210mm round billet in a company, a threedimensional electromagnetic field mathematical model resolved by ANSYS software isdeveloped based on the Finite Elements Method and electromagnetic theory. The distribution lawof magnetic induction, electromagnetic force and the effects of stirring parameters on that arestudied deeply. A three dimensional mathematic model for flow and temperature field isestablished based on hydrodynamics and heat transfer. The effects of stirring parameters on thedistribution of flow and temperature field are investigated systematically, the effect of depth ofsubmerged nozzle is also considered.The results show that:1) The distribution of magnetic induction and electromagnetic force reach its maximum nearthe edge of the billet and decay forward the center on the cross-section at the center of the stirringcoil, the same trend also has found along the drawing direction. The magnetic induction increaseswith the rise of current intensity and decrease with the increase of current frequency; and theelectromagnetic force increases with the increasing of current intensity and frequency.2) In the mold with M-EMS, the flow pattern is upper circulating zone, rotary zone andsecondary circulating zone; the penetrating depth is smaller than that in the mold without M-EMS,which could result in that the superheat disappear quickly. The rotary velocity increase andlocation of hot area is higher with the rise of current intensity and frequency.3) According to the studied results and industrial test, the reasonable stirring parameters andsubmerged depth range are4~6Hz,150~250A and100mm~120mm, respectively.