Metal treatment – Compositions – Heat treating
Patent
1975-09-10
1977-04-05
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
148 203, C21D 148
Patent
active
040160114
ABSTRACT:
The method of this invention is directed to the heat treatment of an iron-containing article and comprises the steps of subjecting the article to an atmosphere comprising specific amounts of nitrogen, carbon, hydrogen, and carbon monoxide and heating this article in this atmosphere. The furnace comprises first and second interconnected chambers, with the first chamber being a heating chamber and the second chamber being a cooling chamber. The first chamber is selectively joined to the second chamber by a gate means. The heating chamber has a heating plate disposed therein arranged and configured to support an article thereon. The heating chamber further has heating means for heating the chamber disposed therein. The cooling chamber has means for positioning the article therein and at least one nozzle for selectively introducing nitrogen gas into the cooling chamber. The furnace also has a gas port extending through the heating chamber which is arranged and configured such that when a gas proceeds therethrough, gas impinges on the heating plate at a predetermined angle. By the use of the furnace and specific atmosphere, iron-containing articles, such as, for example, steel and the like, can be treated to improve their surface characteristics.
REFERENCES:
patent: 3127289 (1964-03-01), Beall
patent: 3188246 (1965-06-01), Olt et al.
patent: 3201290 (1965-08-01), Wyss
patent: 3356541 (1967-12-01), Cullen
patent: 3397875 (1968-08-01), Davis
patent: 3413161 (1968-11-01), Goehring
patent: 3725141 (1973-04-01), Hill
Asai Takeji
Yamazumi Kaishu
Kabushiki Kaisha Fujikoshi
Satterfield Walter R.
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