Cabot Corporation

Wilfredo V Venal

H Joseph Klein

Rodney T Gross

Joseph H Klein

Richard R Daniel

A method and apparatus are provided for forming hollow superalloy ingots by melting a molten superalloy electrode by ESR techniques into a molten slag held in a generally cylindrical mold having an axially movable mandrel until the molten metal is adjacent the level of but not over the top of the mandrel, cooling the metal sufficiently to form supporting external and internal walls, moving the mandrel vertically relative to the cooled metal, continuing to melt metal into said slag while moving the mandrel at a rate such that the molten metal remains at a substantially constant level adjacent the top of the mandrel and cooling the formed hollow ingot.

Methods and apparatus for making cast hollows

A method of decarburizing molten ESR slags to reduce carbon pick up in corrosion resistant alloys is provided in which Fe.sub.2 O.sub.3 is added to the molten slag prior to remelting the metallic electrode in amounts sufficient to reduce carbon in the slag to a desired level.

Methods of decarburization of molten ESR slags and reduction of carbon

A method of decarburizing ESR slags to reduce carbon pick up in superalloys is provided in which NiO is added to the slag prior to remelting the metallic electrode in amounts sufficient to reduce carbon in the slag to a desired level.

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Kokomo, IN, United States of America

Wilfredo V Venal