Influence of Carbon on the Strength of Adhesion of Iron to White Slags and Carbide Slags

Abstract

In tapping special steels from electric arc furnaces, the metal becomes appreciably higher in oxide inclusions, due to the absorption of droplets of furnace slag [1–3]. The tendency of this slag to become entrapped increases with increase in the calcium carbide content of the slag [4–5]. For reducing the content of inclusions, the carbon contained in the CaC₂ must be oxidized, or the carbide slag must be removed from the furnace separately from the metal. In the meantime, there is not yet any unified opinion as to the properties which determine the tendency of slags to become entrapped in steel. It is natural to expect that it will depend on the re la tionship of the strength of the interaction of the ions in the slag itself and the strength of adhesion of the surface layer of the slag to the metal; if the interionic attraction in the oxide phase is weak, adhesion of the surface particles of the latter to the metal will be stronger, they will be detached more readily from the bulk of the slag and be carried along by the stream of metal.