Abstract
Thermodynamic equilibria between CaO-Al2O3-SiO2-CaF2-MgO (-MnO) slag and Fe-1.5%Mn-0.5%Si-0.5%Cr steel was investigated at 1873 K to understand the effect of slag composition on the concentration of Al2O3 in the inclusions in Si-Mn-killed steels. The composition of the inclusions were mainly equal to (MnO)/(SiO2)=0.8(±0.06) (mole ratio) with various Al2O3 content which increased by increasing the basicity of slag. The concentration ratio of the inclusion components, (MnO× Al2O3/SiO2) and the activity ratio of the steel components showed a good linear relationship in a logarithmic scale, indicating that the activity coefficient ratio of the inclusion components was not significantly changed. From the slag-metal-inclusion multiphase equilibria, the concentration of Al2O3 in the inclusions was expressed as a linear function of the activity ratio of the slag components in a logarithmic scale. Consequently, the compositional window of the slag for obtaining the inclusions with low melting point in the Si-Mn-killed steel treated in an alumina refractory was recommended.
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Park, J.H., Park, J.S. (2013). Thermodynamics for the Influence of Slag Composition on the Inclusion Control in Semi-Killed Liquid Steels. In: Krane, M.J.M., Jardy, A., Williamson, R.L., Beaman, J.J. (eds) Proceedings of the 2013 International Symposium on Liquid Metal Processing & Casting. Springer, Cham. https://doi.org/10.1007/978-3-319-48102-9_31
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DOI: https://doi.org/10.1007/978-3-319-48102-9_31
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