Atmosphere compositions and methods of using same for...

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C - Chemistry, Metallurgy

21

D

148/25, 148/42,

C21D 1/76 (2006.01) C23C 8/22 (2006.01) C23C 8/32 (2006.01)

Patent

CA 1073325

ABSTRACT Atmosphere compositions and processes utilizing the compositions for heat treating ferrous metal articles under a controlled furnace atmosphere to either maintain or change the surface chemistry of the article being treated are disclosed in the following specification. The invention features atmosphere compositions or mixtures which are blended from normally gaseous components out- side the furnace and the mixture or blend is injected into the furnace to provide a carburizing, decarburizing, carbonitriding or neutral hardening atmosphere inside the furnace.

264717

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