Rimmed Steel

Low carbon steel that has not completely deoxidized. As the molten steel cools in the mold, the excess oxygen causes decarburization at the solidification interface. This results in an essentially pure-iron, very ductile shell on the ingot. This shell remains throughout the rolling and wiredrawing operations, yielding a wire with excellent forming properties. Rimmed steels cannot be produced on continuous casters used today, but steelmaking advances have allowed killed steels to be produced with similar properties.