Abstract
High calcium or corundum refractories are the main materials in ladle linings used in the refining of stainless steel, and a calcium aluminate glaze layer is usually formed on the surface of these linings during the smelting process. Chemical reactivity experiments between the calcium aluminate glaze layer and molten steel with different alumina inclusions distributions were carried out to study the effect of calcium aluminate ladle glaze on alloy composition and alumina inclusions in stainless steel. A certain amount of alumina inclusions produced by Al deoxidation merged and grew larger in molten steel during smelting. The inclusions also consume a considerable amount of Cr in steel to form a solid solution. Furthermore, the glaze endured erosion in the initial stages because of the dissolution of Ca. The glaze preferentially absorbed smaller particles of the inclusions to reduce the content of alumina inclusions and the consumption of Cr in molten steel, and CaAl4O7/CaAl12O19 with a high melting point was generated in the glaze gradually because of the effect of the absorption.
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