Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1975-11-11
1977-07-19
Shore, Ronald J.
Metal founding
Process
Shaping liquid metal against a forming surface
164DIG6, B22D 2702, B22D 2706
Patent
active
040362787
ABSTRACT:
Large steel ingots are produced without pipe and blow holes and with minimum segregation, by teeming the steel into an ingot mold having a hot top that tapers upwardly and whose open upper end is largely filled by an electrode that is spaced from the steel by an electrically conductive slag. During a first stage, current is passed from the electrode through the slag to the steel at a rate to keep the slag and the steel in the upper end of the mold molten. During a second stage, the current is increased and the electrode consumed to restore the liquid level that has fallen due to contraction upon solidification, the electrode having a lower content in segregating elements than the steel. During a third stage, the current and the metal addition are reduced until the ingot is completely solidified.
REFERENCES:
patent: 1119088 (1914-12-01), McKenna
patent: 2056673 (1936-10-01), Howard
patent: 2893085 (1959-07-01), Johansson et al.
patent: 3786853 (1974-01-01), Cooper
patent: 3807485 (1974-04-01), Paton et al.
patent: 3875990 (1975-04-01), Cooper
patent: 3905803 (1975-09-01), Bianchi et al.
patent: 3916978 (1975-11-01), Plockinger et al.
Centro Sperimentale Metallurgico S.p.A.
Shore Ronald J.
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