C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
22/187, 53/361
C21C 7/00 (2006.01) B22D 27/20 (2006.01) C21C 1/04 (2006.01) C21C 7/068 (2006.01)
Patent
CA 1106621
10.943 METHOD FOR PRODUCING IMPROVED METAL CASTINGS BY PNEUMATICALLY REFINING THE MELT ABSTRACT Castings of superior surface quality and internal quality can be produced by: (1) transferring the melt from the furnace into a separate refining vessel provided with submerged tuyeres, and (2) refining the melt by (a) injecting into the melt through the tuyeres an oxygen-containing gas which may contain up to 30% of a dilution gas, and (b) thereafter injecting a sparging gas into the melt through the tuyeres. Preferably, the oxygen-containing gas is surrounded by an annular stream of a protective fluid. Argon is pre- ferred for dilution, protection as well as sparging.
300003
Hopley William G.
Union Carbide Corporation
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