In-situ generation of heat treating atmospheres using...

Details In-situ generation of heat treating atmospheres using... In-situ generation of heat treating atmospheres using...

C - Chemistry, Metallurgy

21

D

C21D 1/76 (2006.01) B22F 3/10 (2006.01) C22F 1/02 (2006.01) C22F 1/14 (2006.01) C21D 1/26 (2006.01)

Patent

CA 2073137

A method for generating an in-situ atmosphere inside a continuous furnace for maintaining or affecting the surface characteristics of parts exposed to the atmosphere wherein the process composes the steps of heating the furnace to a temperature above 550 degrees C.; injecting into the furnace gaseous nitrogen containing up to 5% by volume oxygen together with a reducing gas, the reducing gas injected into the furnace in a manner to permit reacting of the oxygen and the reducing gas to be essentially complete prior to the mixture contacting the parts heated in the furnace; and moving the parts through the furnace for a time sufficient to achieve a desired heat treatment and surface condition.

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