高铝钢连铸过程中，为了避免或减轻钢液中Al与保护渣中SiO2发生反应，设计了低SiO2、高Al2O3含量的高铝钢连铸保护渣，通过添加适量的酸性氧化物B2O3协调熔渣酸碱性，利用实验分析了B2O3含量对高铝钢保护渣熔融特性、黏度特性及渣膜传热特性的影响。结果表明，B2O3含量在4%~10%时，随着B2O3含量增加，保护渣熔化温度、黏度、黏流活化能均降低，渣膜热流密度增加；保护渣的等温转变曲线(TTT曲线)向孕育时间增加的方向移动，晶体生长速率降低；实验条件下，增加B2O3含量可抑制保护渣中CaF2的析出。

A new mold slag with low content SiO2 and high content Al2O3 is designed in order to avoid or alleviate the reaction between Al and SiO2 during the continuous casting of high-Al steel, the acidity of this slag is adjusted by adding B2O3, and the effect of B2O3 content on the fusion property, viscosity property and heat transfer characteristics through the mold slag film of the mold slag is analyzed. The results show that the fusion temperature, viscosity, viscous flow activation energy decrease and heat flux through the slag film increases with the increase of B2O3 content in the range of 4%~10%; temperature time transformation (TTT) diagrams move to longer incubation time with the increase of B2O3, while the crystallization speed of mold fluxes decreases; under this experiment condition, the precipitation of CaF2 crystals can be restrained by the increase of B2O3 content in the mold slag.

国家自然科学基金资助项目(50874125)；重庆市自然科学基金资助项目(CSTC,2008BB4036)