Mechanism of MgO-C refractories corrosion interacting with CaO-MgO-Al2O3-SiO2-FeO slags

In the production of ultra-low carbon steels, it is especially important to prevent the carburization of the The latter can occur as a result of lining corrosion, when carbon ions transfer from the ladle lining to the melted steel. This process is mainly caused by the corrosive effect of slags on the refractory and is associated with chemical composition and physical properties, such as viscosity. While many slag-refractory systems are rently used in the steel making, such systems often lack sufficient data for the strict modeling of the interaction process. In this work, we investigate the corrosive behavior of various slags on MgO-C lining in order to mize the increase in carbon during the dynamo steel production. It is established that the main factor influencing the wear of the lining is its phase composition. Spinel, which forms at the slag-refractory interface, can washed out from the boundaries of the lining, exposing its internal layers to the slag. However, in the presence calcium aluminate CaAl4O7 4 O 7 in the remaining melt, the intensive washout of the spinel layers is inhibited. components act as a protective factor even when MgO content in the slag is relatively low. Thus, by changing composition of the slag, it is possible to obtain extremely low wear of MgO-C refractories even with small content in the slag and therefore reduce the subsequent carburization of the metal caused by corrosion refractories in the slag zone.