Corrosion resistant steel components and method of manufacture t

Details Corrosion resistant steel components and method of manufacture t Corrosion resistant steel components and method of manufacture t

1984-04-05

1986-01-07

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

148 166, 148203, 148143, 148144, 148148, 148152, C23C 1116

Patent

active

045632235

ABSTRACT:
To impart good salt spray corrosion resistance to alloy steel components, such components are gas nitrocarburized at 550.degree. C. to 800.degree. C. to produce an epsilon layer, oxidized to produce an Fe.sub.3 O.sub.4 layer not more than 1 micrometer thick, quenched into an oil/water emulsion, degreased and then wax coated. The steel components may be surface finished after nitrocarburizing.
A carburizing, carbonitriding or neutral atmosphere heat treatment may be effected prior to nitrocarburizing heat treatment with both heat treatments being effected at above the pearlite to austenite transformation temperature.

REFERENCES:
patent: 4406714 (1983-09-01), Bowes et al.
Nitrotec Surface Treatment, Dawes & Tranter, Heat Treatment of Metals, No. 4, 1982, pp. 85-90.
Coates, et al, "The Oxidation and Corrosion Resistance of Nitrited Iron Alloys", Corrosion Science, 1982, 22(10) 951-72.
Nitrotec Surface Treatment, Lucas Publication 4134/A, Sep. 1982; 4163, 4/29/83.

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