Shield for improving wavy meniscus in the billet continuous casting mold with electromagnetic stirring

Abstract

An electromagnetic shield was developed to improve the wavy meniscus profile in billet continuous casting with in-mold electromagnetic stirring (M-EMS). The characteristics of this shield were investigated through coupled simulation of the electromagnetic and the flow field. These numerical studies found that the designed shield decreases the electromagnetic force near the meniscus to 50% whereas that in the M-EMS core region is reduced about 18%. The designed shield was applied in the real billet caster with M-EMS. The imposed current was increased to compensate the reduced electromagnetic force near the M-EMS core. A close inspection of the produced billets found that the proposed shield greatly reduces the meniscus height even in the case of a stronger rotation flow in the mold. © 2010 ISIJ.