ステンレス鋼溶製過程における鋼滓-鋼浴間の S の分配について
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概要
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Taking slag-metal samples at various working periods, (i.e. before slag-off, before tap and in ladle) during melting process of stainless steel in a 30-t basic electric furnace, sulphur partition at each period was examined. Following results were obtained : 1) The sulphur capacity C_S, i.e. (%S)/a_<[S]>[%Si]^<1/2> at each period was greater, the higher the molar basicity, which was defined as N^2_<CaO>/N_<SiO_2>. 2) The sulphur capacity C_S was increased linearly with decreasing amount of Cr_2O_3 at the constant N^2_<CaO>/N_<SiO_2>. It was considered that the higher the Cr_2O_3 in slag, the smaller becomes the slag-off C_S even in the case when the slag indicated the same value of V_m′・N_<CaO>. 3) Though the effect of MgO content of slag on C_S was rather unobvious as compared with (Cr_2O_3), it was recognized that the sulphur capacity C_S was increased with increasing amount of MgO at the constant N^2_<CaO>/N_<SiO_2> and Cr_2O_3 content. 4) The sulphur capacity, except in ladle, was correlated statistically with the main slag composition as in the following equation : Covering the temperature range 1540 to 1680℃, log [(%S)/a_<[S]>[%Si]^<1/2>]=0.867 log[N^2_<CaO>/(N_<SiO_2>+N_<Cr_2O_3>)]-0.723 5) The sulphur capacity C's, i.e. (%S)(N_<FeO>)/a_<[S]> was less closely related to N^2_<CaO>/(N_<SiO_2>+N_<Cr_2O_3>) than C_S was. 6) The logarithm of sulphur capacity C_S was increased linearly with increase of the excess base, i.e. n CaO-(n SiO_2+n Cr_2O_3). No advantage were obtained in replacing the basicity term, i.e. N^2_<CaO>/N_<SiO_2>+N_<Cr_2O_3>, by the excess base. 7) The logarithm of (C_S (N_<SiO_2>+N_<Cr_2O_3>)/N^2_<CaO>) was a linear function of the reciprocal of absolute temperature. The following equation was statistically obtained : log (C_S(N_<SiO_2>+N_<Cr_2O_3>)/N^2_<CaO>)=-3040/T+0.704. 8) The sulphur content in pit sample was increased rapidly, with increase of the value of N_<FeO> (N_<SiO_2>+N_<Cr_2O_3>)N^2_<CaO> of the final slag composition, if it exceeded above 16×10^<-2>.
- 社団法人日本鉄鋼協会の論文
- 1962-11-01
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