Combined Effects of EMBr and SEMS on Melt Flow and Solidification in a Thin Slab Continuous Caster

Abstract

Electromagnetic fields have emerged as powerful tools for addressing current problems in thin slab continuous casting processes in the iron and steel industry. Substantial studies have been undertaken on the fundamental effects of electromagnetic brakes (EMBr) and strand electromagnetic stirring (SEMS). However, little attention has been focused on melt flow and solidification in a thin slab continuous caster with the simultaneous application of an EMBr and SEMS. The present study aimed to predict transient fields in the caster using a large eddy simulation and an enthalpy-porosity method. The electric potential method was applied in the braking process, and the conductivity change with solidification was considered. The suppressive effect on the intensity of the nozzle jet, the balance effect on the mold flow, and a dispersion effect could be observed. The dispersion effect was a novel finding and was beneficial to a flatter nozzle jet. In contrast, SEMS caused a highly turbulent flow in the strand. A large vortex could be observed in the casting direction. The solidified shell became more uniform, and the solidification rate became obviously slower. These findings supported the view that a high-quality thin slab can be produced by the application of an EMBr and SEMS.

Numerical Modeling of Metallurgical Processes: Continuous Casting and Electroslag Remelting

“…In order to improve the flow stability, temperature homogenization, and reduce inclusions in the CC mold, the electromagnetic brake (EMBr) and electromagnetic stirring (EMS) technology is widely used. Wang et al [5] developed an LES model to study the melt flow and solidified shell distribution in a thin slab caster, simultaneously considering a single-ruler EMBr and a strand EMS. Results show that the coupled application of an EMBr and SEMS can produce a high-quality thin slab.…”

Effect of Electromagnetic Frequency on the Flow Behavior in Mold during Bloom Casting

“…The electromagnetic field formulas [25][26][27] for mold electromagnetic stirring include constitutive equations, Ohm law's, and Maxwell's equations.…”

Modeling Asymmetric Flow in the Thin‐Slab Casting Mold Under Electromagnetic Brake

“…[ 21 ] It allows reducing the impingement effect of the hot jets, promotes the calmness of the meniscus, and enhances the superheat transport for stable flux melting rate, etc. [ 22 ] A recent study of the EMBr effect on the non‐metallic inclusions removal was done by Yin et al [ 23 ] An advance technique, combining a mold EMBr and a strand electromagnetic stirring (SEMS) to enhance uniformity of the solidification, was presented by Wang et al [ 24 ] Another new approach, introducing two vertical magnetic poles (VMPs) in a freestanding and adjustable EMBr (FAC‐EMBr) to weaken the jets interference with the shell and meniscus region, was proposed by Li et al [ 25 ]…”

“…Nowadays, the advance numerical modeling technique resulted in the numerous studies on this topic. [ 24,26–29 ] In the presented study, the coupled solidification and magnetohydrodynamics (MHD) models, previously developed and verified by the current authors, [ 30–33 ] implemented in the open‐source computational fluid dynamics (CFD) package OpenFOAM, [ 34 ] are applied to simulate the effects of the electromagnetic braking on the asymmetric melt flow caused by the partial SEN clogging.…”