特殊鋼熔製の基礎研究

Abstract

Boron recently is known to have a pronounced influence on the hardness of the special steel. Hence a detailed study of this element in liquid iron containing oxygen is an important problem and of considerable interest. Therefore, the authors measured the equilibrium condition in the reaction between boron in liquid iron and the H2-H2O gas mixtures at 1600°C. The equation for the reaction was written as follows:The equilibrium constant and free energy of the above reaction were, at 1600°C. Next, the oxygen content of the molten iron at 1600°C was calculated from the following equation obtained by the authorWhere x, y, were atomic fraction of oxygen and hydrogen in molten iron. Combining Eq. (1) with Eq. (2), the equilibrium relation between boron and oxygen in molten iron was obtainedThe deoxidation product and the free energy as referred to the above reaction was expressed: From these results, it was found that the present data differed greatly from the theoretical valuecalculated by R.W. Gurry, but are approximately in agreement with the experimental value obtained by Gerhard Derge.