Behavior of Non-Metallic Inclusions in Casting Slab of BOF Bearing Steel

The distribution and characteristics of non-metallic inclusion in the bearing steel slabs melted and cast in the process of BOF-LF-VD-CC were explored,with a tracer used to find out the origin of inclusion.The aim is to provide a reference for getting rid of inclusions to improve the quality of BOF bearing steel. The results showed that in the high-cleanness slabs the mean value of T[O] is 9.3×10~(-4) wt%,the micro inclusions are 0.031 vol% and the large-size(50?μm) inclusions are 1.5?mg/10?kg,and most of the inclusions are micro inclusions(5?μm) of which the distribution determines the distribution of inclusions in casting slab as a whole.The micro inclusions are mainly the compounds formed via the adsorption/aggregation of multielement deoxidized compounds and secondarily deoxidized products on tundish liquid level.The rest is mainly the contaminants present in molten steel,which are coming from the liquid level in mould.The liquid level in tundish affects slightly the molten steel.