During casting of titanium stabilised stainless steel, a gradual increase in TiO 2 content in the molten mould slag from absorption of TiO 2 inclusions causes changes in properties of the mould flux, such as viscosity, solidification temperature and crystallisation behaviour. To simulate this effect mould fluxes were prepared with SiO 2 being substituted with 5 and 10%TiO 2 and viscosity and crystallisation behaviour studied. Experimental results indicate that the substitution of SiO 2 with TiO 2 leads to suppression of crystallisation of cuspidine and formation of perovskite in glass quenched from mould fluxes. The crystallisation tendency is reduced by the introduction of TiO 2 . The high temperature viscosity of mould fluxes shows a decrease with increasing TiO 2 . At lower temperature, the viscosity of mould fluxes with 10%TiO 2 is greater than that of TiO 2 free slag, which could be attributed to precipitation of solid particles.

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