Effects Exerted by Slag Carried over From Converter in the Ladle on the Aluminum Assimilation

Abstract

In the present paper are shown aspects of the influence exerted by the some less controlled parameters of BOF steelmaking, mainly of slag characteristics at tapping. Following the necessities to control the steel deoxidization by aluminum assimilation evaluated by soluble aluminum and its behavior, the presented data are evaluated based upon direct measurements of dissolved oxygen in steel before tapping, steel temperature before tapping, argon bubbling in tapping ladle under slag at various contents of (FeO), including its final content. The presented data are obtained in full scale plant conditions on standard weight of heats and applying an established steel making technology. It is concluded that steel temperature in final stage of steel making and (FeO) content of slag carried over from BOF to the ladle exert a strong influence on the aluminum assimilation in steel and further on the other quality characteristics of steel. A strong variability of the parameters taken into account is present and this is due to the insufficient control of the amount of slag carried over to the ladle at tapping.