Abstract
(1) The effects of various elements on oxygen activity are estimated by the behavior of log (%FeO)/[%O] against weight percentage of elements. The effect of aluminium among these elements is strongest.Manganese and silicon have a very slight effect on oxygen activity. Chromium and vanadium have the effects of a corresponding values with the steel metallurgy upon the oxygen activity.(2) The equilibrum constants of each element about the reactions with iron oxide took the characteristic value according its capability of deoxidation.The elements which have strong capacity for deoxidation usually take the higher values.The values of K'Si become to lowest in the deoxidation by silicon, and increase proportionally by elevating the basicity of slag.
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