Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1997-09-29
1998-07-14
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148634, 148708, C21D 176, C21D 174
Patent
active
057798265
ABSTRACT:
The present invention is directed to a method for forming a heat treating atmosphere in which a nitrogen rich gas containing small amounts of oxygen is preheated. An oxygen-reactive gas, such as a hydrocarbon gas, is combined with the nitrogen rich gas and the mixture is reacted outside of the furnace at temperatures above which substantial sooting does not occur. The resulting heat treating atmosphere is then forwarded to the furnace for conducting the heat treating process.
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Chang Edward
Dwyer, Jr. John J.
Nayar Harbhajan S.
Pace Salvatore P.
Schoneman William A.
Swope R. Hain
The BOC Group Inc.
Yee Deborah
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