Abstract
To clarify the characteristics of slag infiltration and heat transfer behaviors in the meniscus region during the casting of high Mn–high Al steel, a mathematical model of a continuous casting mold that couples fluid flow with heat transfer, and solidification is developed. The model is based on the change in slag composition and properties caused by the steel/slag reaction. The formation and evolution of the meniscus profile and slag films for different mold fluxes during mold oscillation are described. The results show that the rapid growth of the slag rim with a high Al2O3 content approaches and deforms the meniscus so that a series of casting problems such as slag infiltration blocking, large fluctuations in heat flux, and even meniscus breaking occur in the continuous casting process. Predictions are in good agreement with plant measurements. These findings provide an improved understanding of the complex phenomena occurring in the meniscus region and give new insights into the evaluation and optimization of mold flux properties for high Mn–high Al steel casting.
Highlights
High Mn–high Al steel is widely used as wear-resistant, non-magnetic, lightweight automobile, and ocean platform steel due to its outstanding mechanical properties such as high tensile strength, extraordinary ductility, and excellent work hardening ability
The aim of this study is to provide a new perspective for the design and optimization of mold flux for high Mn–high Al steel
During the casting of the high Mn–high Al steel, the change in slag composition had a decisive influence on the heat transfer and lubrication conditions between the mold and the solidified shell, which was responsible for the formation of defects during the solidification
Summary
High Mn–high Al steel is widely used as wear-resistant, non-magnetic, lightweight automobile, and ocean platform steel due to its outstanding mechanical properties such as high tensile strength, extraordinary ductility, and excellent work hardening ability. The strong interfacial reaction between high Al–high Mn steel and mold flux occurs in the mold during the casting process. It is known that the slag powder on the top of molten steel is heated and melted to generate a liquid pool. During the continuous casting of high Mn–high Al steel, the change of the slag composition, which mainly embodies Al2 O3 accumulation coupled with SiO2 reduction, deteriorates lubrication and heat transfer conditions in the mold, inducing various kinds of casting problems such as transverse and longitudinal cracks, depressions, and breakout alarms, as reported by Blazek et al [2]. The properties of mold flux have been some of the most important factors that have limited the high-efficiency continuous casting of high Mn–high Al steel
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