Abstract
The evolution of non-metallic inclusions (> 10 µm) for the Al-killed steel in the stainless steelmaking is described. The effects of the slag basicity at the AOD/VOD process, Ca treatment, raw materials (dolomite and spent refractory), reoxidation and vacuum condition on the evolution of the non-metallic inclusion were investigated using the thermo-chemical program (FactSageTM) and the SEM-EDS analysis of the non-metallic inclusions sampled at each process (AOD/VOD-ladle treatment-tundish-continuous casting) and discussed for the beneficial modification of the non-metallic inclusions to obtain better surface quality of the steel in the secondary refining process. The phase stability diagram of the inclusion newly developed from the analysis results and the mechanism for the evolution of non-metallic inclusion in Al-killed stainless steel was suggested.
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