2019 年 105 巻 3 号 p. 369-372
Efficient and sophisticated refining process for highly alloyed steel is required in order to meet the highest-priority demand for physical and chemical properties of such steel products. In the present study, Al deoxidation equilibrium of the molten Fe-Mn system for which the demand has been continuously increasing nowadays was measured in the Mn composition range from 10 to 30 mass% at 1873 K. Equilibrated oxide phase varied depending on Al concentration; MnAl2O4 or Al2O3 was equilibrated at relatively low or high concentration range, respectively. The interaction parameter between Al and O, and equilibrium constant of Al2O3 dissolution reaction estimated from results of Al2O3-equilibrated experiments did not show the significant Mn concentration dependence of the Fe-Mn melt.
