Inhibited annealing of ferrous metals containing chromium

Details Inhibited annealing of ferrous metals containing chromium Inhibited annealing of ferrous metals containing chromium

1980-08-22

1982-06-15

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 166, C21D 148

Patent

active

043349382

ABSTRACT:
A process for limiting the absorption of nitrogen by ferrous metal containing chromium as an alloying additive (e.g. stainless steel) during high temperature annealing in an atmosphere of nitrogen and hydrogen by controlled additions of an inhibitor selected from the group consisting of water vapor, oxygen, nitrous oxide, carbon dioxide or mixtures thereof to the atmosphere while controlling the dew point of the furnace atmosphere and/or the ratio of the partial pressure of the inhibitor to the partial pressure of the hydrogen.

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patent: 3966509 (1976-06-01), Podgurski
patent: 4012239 (1977-03-01), Brun et al.
patent: 4145232 (1980-03-01), Solomon
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patent: 4200477 (1980-04-01), Datta et al.
patent: 4208224 (1980-06-01), Girrell
Koebel, N. K., "Furnace Atmospheres", Iron and Steel Engineer, pp. 81-93, Jul. 1964.
Koebel, N. K., "Surface Activation in the Heat Treatment of Metals", pp. 14-19, Heat Treating.

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