ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Thermodynamic Model for Prediction of Slag-Steel-Inclusion Reactions of 304 Stainless Steels
Ying RenLifeng Zhang
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2017 Volume 57 Issue 1 Pages 68-75

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Abstract

A thermodynamic model was developed to predict slag–steel–inclusion reactions of 304 stainless steels. The dissolved aluminum in the steel, the sulfur distribution ratio and the composition of inclusions equilibrated with varying slags were predicted using the current model. The model can also be widely used to predict the liquid fraction of inclusions. For Al-killed 304 stainless steels, the optimized composition of CaO–Al2O3–SiO2–MgO slags is proposed to modify solid Al2O3 inclusions to liquid CaO–Al2O3–MgO at 1873 K. For Si-Mn-killed 304 stainless steels, the optimized composition of CaO-SiO2-MgO-Al2O3-20%CaF2 slags is suggested to suppress the formation of Al2O3–MgO in SiO2–CaO–MnO–MgO–Al2O3 inclusions and lower their melting temperatures.

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© 2017 by The Iron and Steel Institute of Japan
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