Vacuum treatment of molten metal with simultaneous stirring...

Details Vacuum treatment of molten metal with simultaneous stirring... Vacuum treatment of molten metal with simultaneous stirring...

2005-01-18

2005-01-18

Andrews, Melvyn (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

C075S512000, C266S208000

Reexamination Certificate

active

06843826

ABSTRACT:
A vacuum treatment of cast metal in liquid form employing the steps of: introducing the cast metal in liquid form into a metallurgic ladle; filling the ladle until a guard height ranging between 0.4 and 0.6 m is reached; and treating the metal while bringing the atmosphere above the ladle under vacuum, and simultaneously stirring the cast metal by injecting helium into the base of the ladle during part of or the whole treatment.

REFERENCES:
patent: 3169058 (1965-02-01), Nelson
patent: 3982927 (1976-09-01), Saleil
patent: 4071356 (1978-01-01), Yamamoto et al.
patent: 4518421 (1985-05-01), Foulard et al.
patent: 6162388 (2000-12-01), Huin et al.
patent: 938221 (1963-10-01), None
Database WPI Section Ch, Week 198046, Derwent Publications Ltd., London, GB, AN 1980-81344C, XP002170610, & JP 55 125220, Sep. 26, 1980.

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