Corrosion of nozzle refractories by liquid inclusion in high oxygen steels

Abstract

In order to understand the corrosion mechanism of stopper refractories by liquid MnO-SiO2-FeO-MnS inclusion in high oxygen steels, the chemical reaction between the liquid MnO-SiO2-FeO-MnS slag and several refractories including Al2O3-C, Spinel-C, Al 2O3-AlN-C and ZrO2-C were performed at 1 550°C. It is found that the reduction of the liquid inclusion can occur by C in the refractories to produce Mn-Fe-Si metallic phase and the degree reduction is important factor influencing to the chemical composition and amount of liquid inclusion. From this experimental and thermodynamic study and in plant test, it is found that ZrO2-C(13%) refractory has excellent corrosion resistance against high oxygen steel containing liquid MnO-SiO 2-FeO-MnS inclusion. © 2012 ISIJ.