Molten metal casting

Details Molten metal casting Molten metal casting

1985-11-19

1987-04-14

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 515, 75 593, 164 661, C22B 900

Patent

active

046575871

ABSTRACT:
Molten steel, normally exposed to an atmosphere of air, is protected against impurities by placing a gas containing a major amount of carbon dioxide gas in such quantities and in such proximity to the surface to cause dissociation of the carbon dioxide at a rate which provides a gas barrier or shroud isolating the steel from the surrounding atmosphere. This method may be applied to protecting certain molten steels being transferred from a ladle to a mold, or from a ladle to a tundish and from the tundish to a mold in continuous casting. In a method where a number of shrouding operations are carried out in series, gas under pressure is bled, in increments, from a storage vessel containing a body of liquid carbon dioxide in an overlying ullage space containing vapor. Each increment is ultimately expanded and dispersed at ambient temperature to form the shroud. As each increment of vapor is removed from the vessel, it is replace by withdrawing liquid carbon dioxide, vaporizing it and returning it to the ullage space.

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Barbosa da Silva et al., "Emprego de CO.sub.2 na Descarburacao do Aco em Forno Eletrico", Metalurgia, vol. 28, No. 172, Mar. 1972, pp. 231-237 (w/transl.).
Nakai et al., "Oxidation Prevention of Molten Steel in Bottom-Casting", Chem. Abstr., vol. 92, 1980, p. 234, 92:114595c.

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