Heat-treatment of steels

Details Heat-treatment of steels Heat-treatment of steels

C - Chemistry, Metallurgy

21

D

38/23, 148/42

C21D 1/76 (2006.01) C21D 1/74 (2006.01) C23C 8/32 (2006.01)

Patent

CA 1038734

ABSTRACT OF THE DISCLOSURE The invention relates to a method of and an installa- tion for the heat treatment of steels, such as heating before hardening, annealing, carburization and carbo-nitridation, carried out in a furnace in the presence of a protection or carbon-enrichment atmosphere which flows continuously through the furnace, the atmosphere being obtained by the mixture, before its introduction into the furnace, of a carrier gas including nitrogen and possibly hydrogen, and an active gas constituted by a hydrocarbon, the mixture containing at least 0.2% by volume of hydrocarbon. The active gas may be constitu- ted by ethylene, ethane or acetylene and the treatment is carried out at a temperature between 700° and 1050°C. The installation includes a device for analyzing a regulating valve the furnace outlet, this analyzer actuating a regulating valve for the inlet flow of active gas through a servo-mechanism, in dependence on the proportion of carbon in the treated steel.

216837

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