Control of final nitrogen content during steelmaking by the EAF VAD CC route

摘要

A low nitrogen content in steel processed through the EAF-VAD-CC route can be achieved at the EAF by restricting the nitrogen input in the charge, the use of early slag forming materials, an increase in the carbon content of the charge and oxygen assisted melting. A compact tapping stream at the EAF, delaying deoxidation until at the ladle and a high sulphur retention slag in the VAD also assist in N and S removal. At the caster, gas and ceramic shrouding is employed.