Aluminum deoxidation equilibrium of molten iron-aluminum alloy with wide aluminum composition range at 1873 K

Abstract

AI-0 equilibria in molten Fe-AI alloys were experimentally investigated. Molten steel with varying Al content (0.01-10 mass%) was equilibrated with a pure Al203(s) crucible at 1 873 K in an Ar atmosphere with 3 vol% H2. The oxygen content of steel with Al content higher than 1.0 mass% was found to be much lower than that found in previous works, while the oxygen content for Al content less than 1 mass% was found to be slightly higher, resulting in a smaller equilibrium constant. The interaction parameters as well as the equilibrium constant of the AI-0 equilibria in molten steel at 1 873 K were reevaluated in the present study. The equilibrium for the Al deoxidation of molten steel was well represented up to 10.0 mass% Al using the reevaluated parameters. © 2009 ISIJ.