Study on controlling inclusions and total oxygen of high-carbon steel

Abstract

The inclusion type, and the relationship between inclusions and the total oxygen, and the ways of decreasing the inclusion count and controlling the inclusion evolution are studied. The results are shown as follows: when the slag composition is controlled in an appropriate range, the slag melting point is low and the ability of deoxidation and inclusion absorption are good. The total oxygen is proportional to the count of 0–6 μm inclusions in the unit area. The mixing of the ladle and the removal of inclusion were promoted by optimising the ladle field. By Mg or Ca treatment, the size of Al 2 O 3 inclusions can be reduced. But the large size CaO inclusions may be brought into steel by the Ca treatment. This paper is part of a Themed Issue on Recent developments in bearing steels.