Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1990-08-22
1991-02-12
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148 165, 148 167, 148128, C21D 176, C21D 1100, C21D 908
Patent
active
049921134
ABSTRACT:
Process for the heat treatment of low-alloy steels at temperatures higher than 600.degree. C., such as annealing or heating before hardening, etc., said treatment being carried out in a protection atmosphere produced by the injection of nitrogen, hydrocarbon C.sub.x H.sub.y and optionally hydrogen, with a control of the atmosphere. According to the invention, the composition of the residual species CH.sub.4, CO, H.sub.2 O, and the temperature of the gaseous mixture in the furnace are controlled in order to control the carburization and the decarburization of the treated steels.
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Chem. Abs. 86:20430u, Heat Treatment of Steel Articles Without Formation of Surface Oxides of the Alloying Elements, 9/76, Werner Goehring.
Chem. Abs. 95:101157y, Calculation of the Equilibrium Composition of Blended Gases for Heat Treating Furnace Atmospheres, 6/79, C. A. Stickels.
Chem. Abs. 90:172648s, Protective Gas for the Heat Treatment of Ferrous Metals, 3/79, Wolfgang Trappmann.
Abstract of Japanese Patent J59001626, 1/84.
Metals Handbook, 9th ed; vol. 4; ASM, pp. 361-366, Nov. 1981.
Baldo Pascal
Duchateau Eric
Dean R.
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
Phipps Margery S.
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