MnO-SiO_2-MnS 系スラグの相平衡

概要

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Recently a new process has been developed to control the γ-α transformation of steels using MnS precipitates on the oxide inclusions as nuclei. In order to optimize the composition of inclusions, phase relations for the MnO-SiO_2-MnS system have been investigated at temperatures ranging from 1473K to 1723K. The solubility of MnS increased with an increase in MnO/(MnO+SiO_2) ratio and showed a drastic increase at the ratio of 0.6, which was consistent with the maximum precipitation ratio of MnS in the oxide metallurgy process. An oxysulfide compound composed of 8MnO・3SiO_2・MnS was newly found as a stable solid phase at lower temperature than 1573K. It has been considered that this phase is formed via the peritectic reaction between 2MnO・SiO_2 and liquid phase. Deliberating the compositions of liquids saturated with various compounds at several temperatures, the phase diagram for the MnO-SiO_2-MnS system has been estimated. Finally, the mechanism of the MnS precipitation in the oxide inclusions has been discussed.
社団法人日本鉄鋼協会の論文
1995-12-01