Metal treatment – Compositions – Heat treating
Patent
1983-09-09
1985-05-07
O'Keefe, Veronica
Metal treatment
Compositions
Heat treating
266121, C21D 162
Patent
active
045156450
ABSTRACT:
Metallic work pieces are annealed under protective gas in bright annealing furnaces with subsequent cooling line. Exogas or nitrogen is used as protective gas. In the latter case, liquid nitrogen is evaporated and introduced at several locations in the bright annealing furnace and the cooling line.
For the purpose of decreasing the installation costs, increasing the performance and improving the quality, the liquid nitrogen is sprayed without prior evaporation onto the material to be annealed, namely in the end zone of the cooling line.
REFERENCES:
patent: 3036825 (1962-05-01), Eisenmenger
patent: 3189490 (1965-06-01), Scott
patent: 3407099 (1968-10-01), Schell
patent: 3507712 (1970-04-01), Scott
Messer Griesheim GmbH
O'Keefe Veronica
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