Effect on inclusions in molten iron treated by SiMg,Al and combination of both

The deoxidation experiments of liquid iron were carried out in the high temperature molybdenum wire furnace by adding SiMg alloy, Al and combination of both. At the same time, the additional sequence of SiMg and Al was changed in the experiments. The contents of dissolved and total oxygen and residual magnesium were measured and change of inclusions in molten iron over time was investigated. The results indicate that the limit of deoxidization by the combination of 0.02% (mass fraction) SiMg and 0.03% (mass fraction) Al is comparable with 0.05wt% SiMg only and the yield of Mg in the molten iron treated by the combination is improved greatly at 1 873 K. In the case of SiMg/Al deoxidation, the change of inclusions amount in samples over time is consistent with that obtained by only SiMg. The change of inclusions amount in samples over time in case of Al/SiMg deoxidation is consistent with that obtained by only Al.