METALLIC CAPSULE ADDITIVE

PURPOSE:To obtain a metallic capsule additive for refining or casting of metal which can be stably and easily added at a high yield by sealing metals and alloys, such as alkaline earths, having extremely high oxidability into a metallic capsule having a specific sheath thickness. CONSTITUTION:An additive to be used in the refining process for irons, steels and nonferrous metals, such as for ladles, vacuum degassing devices, tundishes and casting molds for continuous casting or in production of spheroidal graphite cast irons is produced by adding the additive 1 consisting of >=1 kinds among alkaline earth metals, alkaline earth metal-contg. alloys, rare earths and rare earth-contg. alloys into the metallic capsule 2 having the sheath thickness of 1.3 to 5.0mm. As a result, the metallic capsule additive which prevents the oxidation of the additive having the extremely high oxidability is obtd. When the additive is added into molten metal, the metallic capsule melts while settling and the additive comes into contact with the molten metal at depth sufficient for preventing oxidation.