出鋼前溶鋼のガス含有量について : 溶鋼中のガス量におよぼす大気中水蒸気圧の影響 II

概要

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The molten steel in contact with air has the following chemical reaction : Steel+H_2O (in air)⇄2[H] (in steel)+[O] (in steel) K=[H]^2・[O]/P_<H_2O> Therefore, if the distribution of each gas in the air-slag-steel phase will be constant, the relation between P_<H_2O> in air and the gas contents in molten steel of steelmaking practice could explained only by the above equation. But the author presumed in this paper that the [H]^2・[O] value just before tap in steelmaking process with a basic electric arc furnace was not proportional to P_<H_2O> in air, because the hydrogen and the oxygen in molten steel in the steelmaking practice were controlled by each of the following phenomena : (1) As the movement of the hydrogen in the air-slag-steel phase was controlled by the velocity of diffusion in slag, which changed with CaO/SiO_2 ratio of and temperature of slag, the hydrogen content ([H]) in molten steel in contact with molten slag will be effected by CaO/SiO_2 ratio of and the temperature of slag. (2) As the molten steel and the molten slag were not in an ideal state, the ratio between the oxygen content ([O]) in molten steel and the Σ(FeO) content in molten slag would change with the component of steel, the CaO/SiO_2 ratio of slag and the bath temperature.
1961-07-01