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Vol.30, No.11, 1292 ~ 1301, 1992

Title

Study on the Refining of Stainless Steels using Oxidizing Fluxes

김희수Hee Su Kim, 김선효Seon Hyo Kim, 이창희Chang Hee Lee

Abstract

Dynamic features of dephosphorization of Cr containing steels by the oxidizing fluxes consisting of BaO, CaO and halides, are examined to determine possibility of efficient dephosphorization employing a laboratory-scale induction furnace. These oxidizing fluxes can dephosphorize steels more than 50% within refining times less than 10 minutes. In addition, these fluxes simultaneously show a very fast rate of desulfurization with a degree of desulfurization higher than 95%. The refining rate of dephosphorization was found to be controlled by liquid phase mass transfer. The results also show that a degree of dephosphorization increases as decreasing both initial Cr contents in steels and refining temperatures. The initial presence of Cr₂O₃in fluxes diminishes the amount of Cr loss in steels. The higher Cr₂O₃content within it`s solubility in a slag, the higher degree of dephosphorization. The highest degree of dephosphorization was obtained at slag compositions with high basicity and good fluidity.

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