Abstract: Considering that the TiO2 content in molten mould slag increases markedly during casting of titanium stabilized stainless steel and other steel grades, which affects the properties of the molten mould slag, mould fluxes were prepared, and the effect of TiO2 on crystallization temperature, melting temperature, viscosity and solidification temperature was examined. The results show that for the mould flux with basicity 0.85, its crystallization temperature was decreased by addition of 4.5% TiO2, then kept constant with continuous increase of TiO2 content. But the crystallization temperature of mould flux with basicity 1 decreased firstly, then increased markedly with continuous increase of TiO2, owing to the formation of perovskite phase. With the increase of TiO2 content in the range of 0~12%, the melting temperature of slag increased, its viscosity and solidification temperature decreased.

Key words: mould flux, TiO2, crystallization temperature, melting temperature, viscosity

摘要： 针对含钛不锈钢连铸过程结晶器液渣层中TiO2含量明显增加的问题，以配制的含钛保护渣研究了TiO2对不同碱度保护渣的结晶温度、熔化温度、粘度和凝固温度的影响. 结果表明，碱度为0.85时，4.5%的TiO2使渣的结晶温度降低，继续增加TiO2含量，结晶温度不再变化；碱度为1时，随TiO2含量增加，结晶温度先降低后升高，TiO2含量12%时，结晶温度显著升高主要是钙钛矿高温析出造成的. TiO2在0~12%范围增加时，提高了保护渣的熔化温度，降低了保护渣的粘度和凝固温度.

关键词: 保护渣, TiO2, 结晶温度, 熔化温度, 粘度