CaC_2-CaF_2 系フラックスによる高クロム鋼, 高マンガン鋼の脱りん・脱硫と CaC_2 の分解

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Fe-C, Fe-Cr-C and Fe-Mn-C melts were treated with CaC_2-CaF_2 flux by using a rotating MgO crucible containing 1 kg metal at 1550-1600℃ under Ar atmosphere. The important factors of dephosphorization and desulfurization of metal with decomposition reaction of CaC_2 were studied. The degree of dephosphorization, η_P, strongly depended on carbon activity of initial metal, α_<[C]_0>, and η_P increased with the decrease of α_<[C]_0>, and as a result carbon content in metal increased. The value of η_s/f_s increased with the decrease of α_<[C]_0>, where, η_s is the degree of desulfurization and f_s is activity coefficient of sulfur in metal. The distribution ratio of phosphorus, L_P=(%P)/α_<[P]>, depended on calcium content in slag or on α_<[C]>・L_P increased with the increase of (%Ca), and with the decrease of α_<[C]>. The decomposition reaction of CaC_2 followed the relationship of N_<CaC_2>/N_<Ca>=k・α^2_<[C]> 20 min after flux addition. CaC_2-CaF_2 mixture was more effective than only CaC_2 flux for dephosphorization of metal.
社団法人日本鉄鋼協会の論文
1986-09-01