Process of casting steel including rendering the steel bath iner

Details Process of casting steel including rendering the steel bath iner Process of casting steel including rendering the steel bath iner

1987-11-25

1988-11-01

Godici, Nicholas P.

Metal founding

Process

Shaping liquid metal against a forming surface

75 96, 164 661, 164259, 164415, 266207, B22D 1110

Patent

active

047811226

ABSTRACT:
Process of casting steel from a ladle into a tundish, in which the metal which is in the tundish is protected against oxidation and nitridation. The process comprises two consecutive steps: a first step which includes flushing the tundish before the start of the casting of the liquid metal during which a high flow of dry ice or liquid argon is introduced until the oxygen concentration in the vicinity of the zone corresponding to the base of the jet of liquid metal at the start of the casting is lower than about 0.5%; and a second step for the upkeep of the atmosphere in the vicinity of the base of the jet which begins when the liquid metal starts to flow in the tundish, during which dry ice or liquid argon is injected as an upkeep flow which is less than the flushing flow, so as to maintain an oxygen concentration lower than about 0.5% in the vicinity of the base of the jet.

REFERENCES:
patent: 4211269 (1980-07-01), Bentz et al.
patent: 4565234 (1986-01-01), Rimbert
patent: 4614216 (1986-09-01), Savard et al.
patent: 4657587 (1987-04-01), Savard et al.
patent: 4666511 (1987-05-01), Naud
Abstract of Japanese Patent Publication No. 59-1055(A) published Jan. 6, 1984.

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