STUDY ON REACTIVITY BETWEEN MOULD FLUXES AND HIGH-Al MOLTEN STEEL

摘要

During the continuous casting of high-Al steel, some important components of mould fluxes are easily reduced by aluminum in the steel. As a consequence, the performance of mould fluxes may be deteriorated, which will impede the smooth running of continuous casting and affect the quality of casting slab. Thermodynamic calculation and crucible experiments were done to investigate the dynamic reduction of different mould fluxes by the aluminum in the steel, and industry tests based on the research were carried out. It was found that SiO_2, Fe_2O_3, Na_2O and B_2O_3 would react with aluminum in the steel, while the reaction of CaO, CaF_2, MgO, Li_2O, BaO with aluminum in the steel basically not happened. Since the components of CaO-Al_2O_3 based mould fluxes changes a little after the slag-steel reaction, CaO-Al_2O_3 based mould fluxes with stable properties were applied into industry production and the actual application effect is good.