Effect of Deceleration Mode of Traveling Wave Magnetic Field on the Liquid Steel Transportation Behavior in the Mold of Slab Casting

High speed continuous casting with premium quality is currently a key issue in steel metallurgy for its green low carbon development. The transmission behavior of liquid steel in 1 000 mm×230 mm slab continuous casting mold is studied to explore a way for the product quality improvement through nozzle jet flow control by a kind of travelling wave magnetic field deceleration mode. Based on the theory of electromagnetic hot fluid and solidification transport, a coupled three-dimensional numerical model is developed. The model is validated experimentally by electromagnetic force measurement under an equivalent electrical conductivity.The comprehensive effect of the Electromagnetic Level Stabilizer（EMLS） on the metallurgical behavior of mold is proposed based on a multi-parameters evaluation. It is found out that the distribution of electromagnetic force presents a centrally symmetrical pattern on the wide faces of the mold. The optimal frequency of deceleration mode is 4 Hz, and the current intensity plays a leading role to the effect of electromagnetic force. It is suggested that the optimal stirring current intensity should be 200 A for the EMLS to obtain the electromagnetic forces with characteristic of pointing at the nozzle jets downward slightly, which is beneficial to the flow impingement control upon the solidifying shell with less meniscus surface fluctuation and the jet impact depth. It is shown accordingly, that the frequent phenomena such as mold flux involvement and inclusions or gas bubbles under solidification hook could be effectively eliminated by the adoption of mold EMLS, which is vital to the improvement of the final surface quality of IF steel products.