Metal treatment – Compositions – Heat treating
Patent
1974-12-19
1977-07-12
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
148 166, 148 203, C21D 148
Patent
active
040352030
ABSTRACT:
The invention relates to a method of and an installation 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 constituted by ethylene, ethane or acetylene and the treatment is carried out at a temperature between 700.degree. and 1050.degree. C.
The installation includes a device for analyzing the atmosphere at 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.
REFERENCES:
patent: 3058815 (1962-10-01), Davis
patent: 3356541 (1967-12-01), Cullen
patent: 3413161 (1968-11-01), Goehring
patent: 3693409 (1972-09-01), Yamagishi
patent: 3705058 (1972-12-01), Kolozsyari et al.
patent: 3748195 (1973-07-01), Kondo et al.
patent: 3790413 (1974-02-01), Kanetake
patent: 3870572 (1975-03-01), Brugger et al.
Godart Pierre
L'Hermite Mathurin
Le Bossenec Raymond
Pierrard Francois
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
Satterfield Walter R.
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