Metal treatment – Compositions – Heat treating
Patent
1979-12-28
1982-03-30
Sheehan, John P.
Metal treatment
Compositions
Heat treating
148 166, 148 167, C21D 148
Patent
active
043222552
ABSTRACT:
The present invention relates to improvements in processes for treatment of steel under a controlled atmosphere.
Use is made of an atmosphere formed by a carrier gas comprising or containing industrially pure nitrogen and by an active gas formed by a hydrocarbon such as: CH.sub.4, C.sub.4 H.sub.10, C.sub.3 H.sub.8, C.sub.2 H.sub.4, C.sub.2 H.sub.2, C.sub.2 H.sub.6, and by carbon monoxide fed in under the form of pure gas or obtained by decomposition of methanol, the treatment being performed between 750.degree. and 1150.degree. C.
The invention is applicable to heating prior to hardening, to annealing, to carburization and to carbo-nitriding of steels.
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patent: 3693409 (1972-09-01), Yamagishi
patent: 3946817 (1976-03-01), Prince
patent: 4035203 (1977-07-01), L'Hermite et al.
patent: 4049472 (1977-09-01), Arndt
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Metals Handbook, vol. 2, American Society for Metals, 1964, pp. 104-106.
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
Robinson, Jr. Lee C.
Sheehan John P.
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