Metal treatment – Compositions – Heat treating
Patent
1984-10-19
1987-03-10
Brody, Christopher W.
Metal treatment
Compositions
Heat treating
148 166, C21D 126
Patent
active
046489142
ABSTRACT:
Soot deposition from protective atmospheres and residual lubricants normally carried on ferrous wire and removed during annealing. During the cooling stage of an annealing cycle, air or other suitable oxygen containing gas is introduced into an annealing furnace containing the wire when the wire temperature is between approximately 1050.degree. and 950.degree. F. At these temperatures, the introduced oxygen is effective to volatilize the residual lubricant and soot formed from decomposition of carbon monoxide. This removal is accomplished without significant decarburization of the wire and only minor oxidation thereof. The oxygen containing gas may be introduced into a bell furnace by raising the inner cover thereof or the oxygen containing gas may be injected into the inner retort of a bell furnace or directly into a batch furnace.
REFERENCES:
patent: 3966509 (1976-06-01), Podgurski
patent: 4016011 (1977-04-01), Asai
patent: 4359351 (1982-11-01), Levis
patent: 4461656 (1984-07-01), Ross
Cornelssen Cornelius W.
Stanescu Mircea S.
Weinstein David J.
Brody Christopher W.
Cassett Larry R.
Draegert David A.
The BOC Group Inc.
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