DETERMINATION OF OXYGEN IN CAST IRON

Abstract

Recently, the determination of oxygen in cast iron has been required and it is important to determine not only the total oxygen but the oxygen as each oxide. The non-metallic inclusion method such as the chlorine method, the electrolytic method, the hot nitric acid method etc. is the usual method for determining each oxide in cast iron but this method is tedious and not reliable. The authors studied on the fractional vacuum-fusion method and it was found that by using a tin-bath, FeO could be extracted at 1050°C, MnO at 1150°C, SiO₂ at 1450°C and Al₂O₃ at 1750°C by this simple method. The same cast iron samples were analyzed bv the fractional vacuum-fusion method, the hot nitric acid method, the chlorine method and the electrolytic method. Successful results were obtained by the fractional vacuuni-fusion method in comnarison with the case of the non-metallic inclusion method.