A phase diagram was drawn through thermodynamic calculation to understand the equilibrium conditions of 2MgO·SiO2, MgO·Al2O3, 3Al2O3·2SiO2, and 2MgO·2Al2O3·5SiO2 formation in Mg-Al-Si-O system of 430 stainless steel melts at 1873 K. Further, the thermodynamic formation and transformation conditions of MgO·Al2O3 inclusion were discussed. The following results are obtained when wSi=026% and wO=10×10-5 in molten steel. The uniphase cordierite inclusion is difficult to exist stably; MgO·Al2O3 inclusion cannot be formed in case of wAl being less than 1×10-6; 3Al2O3·2SiO2 would change to MgO·Al2O3 and 2MgO·SiO2 in turn with increasing the Mg content when wAl is above 17×10-6; with the formation of MgO·Al2O3 inclusion, Al content increases with increasing Mg content when wMg is over 17×10-9. For equilibrium condition and calculated steel composition, 2MgO·SiO2 inclusion would be formed ultimately and MgO·Al2O3 is almost inexistent.
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