Effects of Nickel, Cobalt, Tungsten, Molybdenum, Chromium and Tin on the Activity Coefficient of Oxygen in Liquid Iron

Activity of oxygen in liquid steel-I

Abstract

The equilibrium of oxygen in liquid iron with H₂-H₂O mixtures has been studied at 1550°C, 1607°C and 1663°C respectively.
Effects of nickel, cobalt, tungsten, molybdenum, chromium and tin on the activity of oxygen in liquid iron have been studied at 1600°C.
The data obtained are summarized as follows:
1. H₂+O=H₂O
log K₁[=P_H2O/P_H2·a₀]=7, 480/T-3.421
ΔF⁰₁=-34, 220+15.65T
2. The interaction parameter of oxygen in liquid iron, e′₀:
e′₀[=∂log f′₀/∂[%O]]=-10, 130/T+4.94
3. The effects of alloying elements on the activity coefficient of oxygen in liquid iron:
e^(Ni)₀=∂log f^(Ni)₀/∂[%Ni]=+0.0053 Ni<40%
e^(Co)₀=∂log f^(Co)₀/∂[%Co]=+0.0080 Co<40%
e^(W)₀=∂log f^(W)₀/∂[%W]=+0.0117 W<20%
e^(Mo)₀=∂log f^(Mo)₀/∂[%Mo]=+0.0117 Mo<10%
e^(Cr)₀=∂log f^(Cr)₀/∂[%Cr]=+0.0117 Cr<12%
e^(Sn)₀=∂log f^(Sn)₀/∂[%Sn]=+0.0117 Sn<14%