Influence of TiN(0.5%~2.5%) and TiO2(1%~5%) on melting and crystalline temperature have been studied and analyzed in ferritic stainless steel containing titanium mold powder. The results show that with the increasing TiN content from 0.5% to 2.5%, the melting and crystallization temperature of mold power change between 1053~1082°C and 951~981°C respectively. With TiO2 content from 1% to 2%, the melting temperature is lower from 1066°C to 1047°C. As the content of TiO2 increasing to 5%, melting temperature increases obviously to 1077°C. TiO2 has less effect on the crystallization temperature of mold power.

Clogging of 409 Stainless Steel is serious, and it has difficult in continuous-casting, which have an effect upon the quality of casting blank. By way of calculation and analysis, TiN inclusions form in 409 stainless steel with w[N]•w[Ti] ≥0.00014, but TiN is oxidated to TiO2 easily. A lot of TiO2 inclusions which are due to reoxidization increase, which attach to the inner wall of the nozzle and form TiO2 type clogging. With [Ca]≥0.00032% and [Ti]=0.003%, CaO•TiO2-MgO•Al2O3 dual phase inclusions bring on CaO•TiO2 type clogging in the nozzle. At the same time, there are some strategies to control the above mentioned clogging.

The solidification shrinkage of liquid steel has an important impact on thermal deformation behavior of high-temperature thin shell. Solidification shrinkage of liquid steel is an important basis for structure and shap optimization of the mould. In this paper, a direct coupled model was built on heat transfer in solidification and stress-strain by using the ANSYS software. And solidification shrinkage of liquid steel with the interior temperature and stress distribution were studied in the process of steel solidification, and it provided a theoretical basis for the further optimization of shape of the thin slab FTSC mould. This study was based on analysis of temperature and stress, deriving calculation of solidification shrinkage of steel’s phase change on macro-state by calculating the variation discipline of the distance between nodes.