Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1984-05-16
1985-09-17
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 49, 164459, B22D 1900, C21C 700
Patent
active
045418659
ABSTRACT:
The invention provides an improved system for continuous processing of molten steel and other metals comprising continuous withdrawal, vacuum treatment and casting, employing a specialized post-treatment vessel stationed adjacent to a continually maintained supply of metal in a furnace bath. The post-treatment vessel incorporates a vacuum degassing column chamber section which is fed with metal through a withdrawal tube with the inlet inserted into the furnace bath and the outlet into the degassing column, the lower portion of which extends laterally into a tundish pouring section from which metal is poured through a nozzle directly into a continuous caster. Sealing of the continuous casting tundish cover, which is incorporated into the post-treatment vessel assembly, is a key element of the invention. Firstly, this provides for initial post-treatment vessel evacuation to start metal withdrawal, simply by sealing off the tundish nozzle (optionally together with a withdrawal tube valve), eliminating secondary starting gates, seals, or the like for the degassing column section. Secondly, it provides a metal flow path from furnace-to-mold completely excluded from the atmosphere. Thirdly, it practically eliminates the influence of intermediate flow restrictions and control points between bath and molds, the overall rate of metal flow being self adjusting throughout, according to withdrawal rate of the solidified casting, which is subject to direct external operator control. Fourthly, by excluding the atmosphere from furnace through to mold, the invention eliminates the well-know deleterious effects of oxygen and nitrogen contact with the molten steel.
REFERENCES:
patent: 3467167 (1969-09-01), Mahin
patent: 3650517 (1972-03-01), Messing
patent: 4105438 (1978-08-01), Sherwood
patent: 4456476 (1984-06-01), Sherwood
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