Thermodynamic analysis of inclusions in Ti-deoxidised steels

The precipitation of non-metallic inclusions in Ti-deoxidised steels is ana lysed with the multiphase equilibrium code CEQCSI which is based on the IRS ID slag model. For that purpose, the slag model has been extended to system s containing titanium oxides, using data available in the literature, and v alidated with industrial results obtained on various steel grades. Applicat ions concerning slag-metal reactions in ladle metallurgy are described. 2 a pplications concerning inclusions in Ti-deoxidised steels are also presente d: (a) experimental study of the effect of steel contamination by magnesia refractory lining on the composition of oxide inclusions in a Ti-deoxidised steel: there is a good correlation between analysed oxide compositions and compositions predicted by the model; (b) evaluation of the optimised steel composition to obtain Al2O3-TiO2 inclusions during solidification for stee ls pertaining to the so-called "metallurgy of oxides in steels".