Industrial Trials of Permanent Magnet Stirring During Billet Continuous Casting

Electromagnetic stirring has become an essential technique to improve billetBillet quality during continuous castingContinuous casting processProcess. Compared with the conventional electromagnetic stirring (EMS), permanent magnet stirringPermanent magnet stirring (PMS) based on sintered NdFeB materialMaterials owns the great advantages of simple structureStructure, high magnetic flux densities, and low power consumption. In this work, the characteristics differences between electromagnetic stirring and permanent magnet stirringPermanent magnet stirring are explained, and the present application of permanent magnet stirringPermanent magnet stirring is also introduced in square billetBillet continuous castingContinuous casting. Industrial trials suggest that mold PMS can decrease the hole defectsDefects on the surface and improve the central porosityPorosity and carbon segregationSegregation of the billetBillet. Final permanent magnet stirringPermanent magnet stirring is adopted at solidificationSolidification end of the high carbon steelCarbon steel continuous castingContinuous casting. Experimental results reveal that with the increase in the rotation speed of PMS, the central carbon segregationSegregation index of the billetBillet decreases obviously.