Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1978-09-29
1980-01-22
Rosenberg, P. D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 10R, C22B 400
Patent
active
041848691
ABSTRACT:
A method of controlling contamination of, and alloy variations in the remelted product of an electro-slag refining (ESR) or remelting process. More particularly, this invention is directed to a slag forming flux, to the timing and/or manner in which the flux is utilized during such method, and to a slag deoxidizer. The controls are achieved by the sequential additions of a (1) flux of predominantly CaF.sub.2 /Al.sub.2 O.sub.3 with the balance a mixture of SiO.sub.2 and MnO, and (2) a non-aluminum containing slag deoxidizer such as CaSi. Preferably, the flux is added in two portions about one-third at start-up with the remainder after the start-up portion has melted to form a slag blanket. As a preferred alternative, the total amount of SiO.sub.2 /MnO of the flux is added with the start-up portion and the remainder portion comprises essentially only CaF.sub.2 /Al.sub.2 O.sub.3.
REFERENCES:
patent: 3841923 (1974-10-01), Dudko
patent: 3857702 (1974-12-01), Corbett
patent: 3950163 (1976-04-01), Nafziger
patent: 3997332 (1976-12-01), Nafziger
patent: 4061493 (1977-12-01), Jaeger
"Potential of Electroslag," Metals, pp. 44-49 (Mar., 1967).
Bethlehem Steel Corporation
Noll William B.
O'Keefe Joseph J.
Rosenberg P. D.
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