Equilibrium between Dissolved Mn and O in Molten High-Manganese Steel

Abstract

This paper describes the equilibrium relation between dissolved manganese and oxygen in molten high-manganese steel equilibrated with solid MnO. The equilibrium constant of manganese deoxidation was obtained as follows, MnO(s) = Mn + O logKMn = - 11 900/T + 5.10 (1823 K < T < 1923 K) The interaction parameter between Mn and O in liquid iron was independent of temperature and is given by eOMn = - 0.037 (mass % Mn < 24, 1823 K < T < 1923 K). The interaction parameter formalism with only the first order parameter can represent the variation of the activity coefficient up to 24 mass % Mn in this system, when appropriate correction for aMnO is applied.