The Effect of Pressure and Oxygen, Sulfur and Nitrogen Content on the Rate of Nitrogen Absorption and Desorption of Liquid Steel

Abstract

The study was made on the rate of nitrogen absorption and desorption by means of vacuum induction furnace to reveal the effect of pressure on the rate of desorption of nitrogen and the effect of oxygen, sulfur and nitrogen content on the chemical reaction rate at gas-metal interface. Nitrogen desorption rate was decreased with increase in total pressure of atmosphere, which was controlled by argon gas. The apparent chemical reaction rate of nitrogen adsorption and desorption under the condition of which the mass transfer resistance in gas phase is negligible, was evaluated. Adsorption constant of oxygen, sulfur and nitrogen at 1873K was evaluated from the dependence of apparent chemical reaction rate constant on the oxygen, sulfur and nitrogen. With these values, some previously reported results of investigations on the chemical reaction rate of nitrogen are consistently concluded in the following equation.kr=15.9fN2/(1+173aO 52aS17aN*)2Calculated surface tension of liquid iron was also consistent with observed data by P.Kozakevitch et al..