Abstract
The galvanizability of high strength steel is dependent on the surface selective oxidation of alloy elements during intercritical annealing. First, this study reviewed the selective oxidation of Mn, Si, Al, Cr, and their possible products. Then we applied three sets of elemental activity data, i.e., calculated from Thermo-Calc, molar fraction, and aM (M = Mn, Si, Al, Cr) = 1 to calculate the equilibrium oxygen partial pressure of each oxidation reaction. It was found that there is a significant deviation among the results calculated from different data. Finally, this study established the stabilities and precipitation sequences of Mn–Si, Mn–Al and Mn–Cr mixed oxides, and proposed a new Mn–Cr rule to predict the oxides formed on the surface of Mn–Cr steel.
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