Reaction behavior of high manganese and high aluminum steel with chromium-containing ladle filler sand.

In order to understand the reaction mechanism of high manganese and high aluminum steel with ladle filler sand and improve the ladle free-opening rate, some laboratory experiments were carried out. The effect of [Mn] and [Al] contents in the steel and reaction time on the interfacial reaction of steel-sand were considered. The reaction mechanism between the steel and filler sand is as follows. Firstly, [Mn], [Fe]and [Al] in steel react with SiO₂ in filler sand to form a liquid phase dominated by MnO-Al₂O₃-SiO₂-FeO. With the progress of the reaction, [Mn] and [Al] gradually reduce FeO, which leads to some metallic Fe being generated. Secondly, the liquid phase is further expanded, and solid phase (chromite phase) is dissolved into the liquid. At the same time, the Cr₂O₃ in the liquid phase is reduced by [Al] in the steel. Finally, the liquid phase flows down by the gaps because of gravity, forming a sintered layer. In addition, both [Mn] and [Al] in steel can increase the liquid phase of filler sand, because the MnO and Al₂O₃ of reaction products will lower the liquidous temperature, thus aggravating the sintering of filler sand. [ABSTRACT FROM AUTHOR]