study has been made of inclusion segregation in ingots of rare earth treated O·1%C–1·35%Mn–o·025%S steel. It has been shown that the distribution and aggregation of inclusions is a sensitive function of the solidification mode. On a macroscopic scale, the occurrence of bottom-cone segregation in high-sulphur rare earth treated ingots has been confirmed, and a mechanism has been advanced to account for the phenomenon. This mechanism involves the scavenging of inclusions in the bulk melt by sedimenting dendrites during their descent to the bottom of the liquid metal pool, and emphasizes the interrelation between bottomconeformation and the existence of an ingot equiaxed zone.
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