PR-503-068 - 2019 STEELSIM Conference Proceedings

Modeling of Transient Behavior of Top-Surface Slag/Molten Steel Interface in Continuous Slab Casting

Seong-Mook Cho and Brian G. Thomas

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Abstract:
Mold flux is added onto the surface of the molten steel pool in the mold during steel continuous casting to prevent reoxidation of the steel, to capture non-metallic inclusions, to insulate the surface from heat loss, and to lubricate the solidifying steel shell against the mold walls. However, unoptimized mold flow phenomena such as excessive surface velocity and surface level fluctuations can entrain the mold flux into the molten steel or may entrap slag into the steel shell [1], leading to slag defects in final steel products [2,3]. It is well known that slag defects may arise even during steady casting conditions, due to chaotic transient behavior at the mold flux/molten steel interface, such as sudden level drops [4]. Thus, it would be useful to improve understanding of transient flow behavior in this important region of continuous casting process.


Keywords: LES, VOF, RANS, standard k-?, surface instability, slag, entrainment, entrapment, slab mold