Effect of electromagnetic parameters on the motion and entrapment of inclusions in FC-Mold continuous casting strands

¹ School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, P.R. China
e-mail: wtfwawj@163.com
² Shougang Jingtang Iron and Steel United Co. Ltd., Tangshan 063200, P.R. China

Received: 27 October 2015
Accepted: 29 January 2016

Abstract

In the current study, the three-dimensional fluid flow, heat transfer and solidification in FC-Mold continuous casting strands were simulated, and the influences of upper and lower magnetic fields of FC-Mold on the distribution of inclusions beneath the surface of the slab were discussed, considering the washing effect of flow on the solidifying front. The results indicate that the influence of FC-Mold on fluid flow in steel continuous casting mold is determined by the choice of SEN and the intensity of upper and lower magnetic fields. Larger upper magnetic field intensity was not recommended due to high flow speed at meniscus. The maximum flow speed at meniscus was 0.48 m/s when the upper magnetic intensity was 0.68 T in the current simulation. After applying FC-Mold, more superheated molten steel was brought to the upper recirculation zone contributing to temperature increase at meniscus. With regard to the entrapment of inclusions, a criterion was established and validated, considering the effect of flow on the motion of inclusions. Increasing the intensity of upper and lower magnetic fields could make the region 5 mm below the surface become cleaner, and eliminate the aggregation of inclusions.