Pack nitriding process for low alloy steel

Details Pack nitriding process for low alloy steel Pack nitriding process for low alloy steel

C - Chemistry, Metallurgy

23

C

148/25

C23C 9/14 (1980.01)

Patent

CA 1062132

PACK NITRIDING PROCESS FOR LOW ALLOY STEEL ABSTRACT OF THE DISCLOSURE A method of nitriding metal parts is disclosed. A preferred mode requires burying the metal part to be treated in a body of vermiculite or other porous media containing urea. Prior to burying, a controlled amount of an aqueous urea solution is absorbed into dry vermicu- lite; the water of the solution is removed by evaporation leaving a pasty urea substance coating or impregnating the grains of the vermiculite. The urea-bearing vermicu- lite and buried part are heated in a closed container to a temperature at which the urea decomposes and releases gaseous nitrogen bearing gases. Heating is then continued for about 4-8 hours at 700-1300°F (preferably 925-1050°F for 90% of the applications) to achieve a nitrided case on the part of the thickness desired, typically .002-.005" thick.

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