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Abstract
The solubility of chromium oxide in the CaO-CaF2 system has been determined at 1773K by equilibrating the flux with a CaO·Cr2O3 pellet at the oxygen partial pressure of 2.28×10-7 Pa. The solubility of Cr2O3 varies from 0.80 to 1.28 mass%in the flux with increasing the CaO content from 15.6 to 20.6 mass%.In case of the dephosphorization of Fe-Cr-C melts with CaO bearing fluxes, the prevailing oxygen partial pressure of the system is controlled by the reaction between CaO and Cr2O3 forming CaO·Cr2O3. The phosphorus distribution ratio between Fe-Cr-Csatd. alloys and CaO-SiO2-CaF2 fluxes saturated with CaO·Cr2O3, CaO and 3CaO·SiO2 has been measured at 1573K. The phosphorus and chromium distribution ratios decrease with increasing chromium content of the metal from 1 to 13 mass%.
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