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

1982-10-08

1985-01-29

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 166, 148 315, C23C 1114

Patent

active

044964013

ABSTRACT:
A non-alloy steel component is nitrocarburized at 550.degree. to 720.degree. C. for up to 4 hours in a nitriding gaseous atmosphere eg. ammonia or ammonia and endothermic or exothermic gas, and is thus exposed to air or other oxidizing atmosphere for 2 to 120 seconds to form an oxide-rich layer thereon before being quenched into an oil/water emulsion, degreased and a tack-free wax coating applied. Alternatively, the component may be cooled in air or other oxidizing atmosphere and then wax coated or it may be cooled in a non-oxidizing atmosphere and then reheated to provide the oxide-rich surface layer before being cooled again and wax coated. As a further alternative, the component may be cooled, lapped to a surface roughness of not more than 0.2 micrometers Ra, reheated to oxidize and then quenched. These techniques give a good corrosion resistance to the component.

REFERENCES:
patent: 3479229 (1969-11-01), Becker
patent: 4131492 (1978-12-01), Fushimi et al.

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