Effect of Stirring and Lanthanum in the Steel on the Interfacial Reaction Between the Steel and the MgO-C Refractory

In the current study, laboratory experiments were performed to investigate the interfacial reactionInterfacial reaction between the molten steel and the MgO-C refractoryMgO-C refractory, and the effect of lanthanum in the steel was studied. A dense MgOMgO reaction layer with a 50 μm thickness at the interface between the quiescent steel without lanthanum and the refractory was observed. Under stirring condition, the thickness of the MgO reaction layer was only 25 μm and the layer was non-continuous and broken at some places. For the interfacial interaction between the lanthanum-bearing steelLanthanum-bearing steel and the MgO-C refractoryMgO-C refractory, under quiescent condition, a double-layer structure was generated, with a MgO layer close to the refractory side and a La2O3 layer close to the steel side. Under stirring condition, a La2O3-La2O2S layer was generated and a few LaAlO3 particles were embedded inside the MgOMgO reaction layer. The stirring induced the dislodgement of MgO particles from the lining refractory into the molten steel.