In order to predict the variations of the process variables caused with the progress of blowing oxygen in LD converter, mathematical model for oxygen absorption accompanied by the simultaneous reactions in connection with carbon, silicon and iron existing in the neighborhood of cavity in steel bath has been developed in this work.
By use of this model, the changes of temperatures and compositions of steel bath and waste gas, and those of evolution rate of waste gas can be estimated.
Numerical calculations based on this model under various operating conditions have been conducted with the aid of digital computer (HITAC 5020E), and from comparison of estimations with empirical results obtained by other investigators in LD converter of 150 t the authors have believed that this model may be used for prediction of behaviors of process variables.