CaC₂-CaF₂フラックスによるFe-Cr-C合金の脱りん

抄録

ESR experiment was made in which CaC₂-CaF₂ flux was used as an electro-flux under an inert atmosphere. Fe-C alloys containing Cr up to 64% were remelted. P and N contents as well as O and S ones of the alloys were found to be reduced during the remelting. Simultaneously, carbon pick-up was observed, indicating that CaC₂ was decomposed into Ca metal dissolved in CaF₂ melt and C in the liquid alloy. The refining ability of CaC₂, therfore, was equivalent to that of Ca metal. The degree of phosphorus removal was determined only by the rate of CaC₂ decomposition which was evaluated as a function of the feeding rate of CaC₂ powder and the activity of carbon dissolved in the liquid alloy. Practical applications of CaC₂-CaF₂ flux as a new dephosphorizing reagent in refining processes were discussed.