METHOD AND APPARATUS FOR CONTINUOUSLY CASTING HOLLOW ROUNDS

摘要

A method and apparatus for continuously casting a hollow round for manufacturing seamless tubing. Apparatus includes an open-ended tubular water-cooled mold and a tubular water-cooled lance suspended within the mold, leaving an annular cavity therebetween. Molten metal is poured into the cavity. Outside and inside skins solidify on the metal, at first leaving a liquid core between the two skins. There is a problem that the inside skin tends not to remain concentric with the outside skin. Invention provides magnetic means acting on plugs within the inside skin to hold the two skins in a concentric relation.