Interaction Between MgO-Bearing Lining Refractory Rods and a High-Carbon SiMn-Killed Steel

In the current study, the interaction between refractory rods and a high-carbon SiMn-killedHigh carbon SiMn-killed steel was investigated via laboratory experiments and thermodynamic calculations. The carbon-bonded magnesia (MgO-C) refractory and the magnesite (MgO)MgO refractory were compared. After 90 min of contact, the penetration of the molten steel into the MgOMgO refractory was little and the interfacial reactionInterfacial reaction layer was little observed so the inclusionsInclusions in the steel varied little. After 90 min of contact, the molten steel penetrated the MgO-C refractoryMgO-C refractory for 1 mm through grain boundaries and C-phase channels in the lining refractory. A 80 μm thick CaO-CaS-MgO-MgS layer between the steel and the MgO-C refractoryMgO-C refractory formed and inclusionsInclusions in the steel were transformed from original SiO2-MnO-Al2O3 ones with a spherical morphology to MgOMgO and MgO-Al2O3 ones with an irregular shape, indicating the occurrence of the desulfurizationDesulfurization of the steel by the CaO-phase in the grain boundary of the lining refractory.