连铸保护渣与氧化铝的交互作用研究现状

Research status of the interaction between mould flux and alumina

保护渣中Al2O3质量分数变化是渣钢交互作用的结果,包括吸附钢液中Al2O3夹杂和渣金反应产物。氧化铝对保护渣成分与性能稳定性影响突出,进而影响铸坯质量。分析指出,影响保护渣吸附Al2O3夹杂的因素包括接触角、润湿速率和界面张力、熔渣成分和性能等。熔渣与夹杂物的交互作用行为决定了其对上浮夹杂的去除率。高铝钢连铸过程渣金反应尤为突出,保护渣的工作性能将发生明显改变。基于近年关于Al2O3夹杂的吸附溶解试验研究,以及高铝钢浇铸渣金反应及其保护渣性能变化的研究结果,探讨了通过合理设计保护渣成分或更换渣系等措施来实现该类钢种保护渣工作性能的相对稳定性。

The change in alumina content in mould flux is the result of slag-metal interactions, including adsorbing alumina inclusions in steel and slag-metal reaction product. Alumina content has a dramatical influence on the compositions and performance stability of mould flux, and further affects the strand quality. The factors that impact on the adsorption of alumina are contact angle, wetting rate, interracial tension, composition and performance of mould flux. The removal rate of floating alumina inclusions is determined by the interaction of mould flux and inclusions. The slag-metal reaction is more intensive in the casting process of high aluminium steel, which leads to the the chan- ges in performance of mould flux. To achieve the relative stability of mould flux performance, some measures such as rational design of mould flux compositions or selecting anther mould flux system are discussed ,based on the experiment researches on absorption and dissolution of alumina inclusion in recent years and the research results of slag-metal reaction and variations of mould flux performance in the casting process of high aluminium steel.