Abstract
The corrosion behavior of alumina-silica (Al2O3–SiO2) refractories by liquid carbon steel was studied. This was performed by a refractory crucible test in a vacuum induction furnace at 1520–1545 °C under reducing atmosphere. The results indicate that Mn, Si and a minor amount of Fe in the steel were oxidized at steel/refractory interface, combing with refractory components to form a MnO–SiO2–Al2O3–based slag. This slag was liquid at the testing temperature, and infiltrated along the open-pore network and the grain boundaries into the Al2O3–SiO2 refractories. Both Al2O3–rich and Al2O3–SiO2 aggregates in the refractories dissolved into the infiltrating slag. As a result, the refractories were structurally weakened and residual Al2O3–rich and Al2O3–SiO2 aggregates in the hot face of the refractories were washed away into the liquid steel, affecting steel quality.
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