A mathematical model was developed to simulate the electromagnetic field and the flow and temperature fields for the different operation conditions of S-EMS in slab casting. The influence of the stirrers on the melt steel velocity was investigated for cases with one-stage stirrers placed face-to-face on both sides of the strand or with two-stage stirrers placed side-by-side just on the inner side of the caster. The simulation result showed that face-to-face arrangement could provide a stronger stirring intensity. However, due to the easy accumulation of slag on the outside radius, an S-EMS with double-stage stirrers placed closer to the strand between the rolls on the inside radius was developed to meet the demands of internal quality for high silicon steels. The newly-developed S-EMS proved to be a very effective device for creating an extended equiaxed zone for silicon steel, and an average of above 45% was normally achieved to significantly improve the ridging index.
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