CORROSION RESISTANT STEEL COMPONENTS AND METHOD OF MANUFACTURE THEREOF

摘要

To impart good salt spray corrosion resistance to alloy steel components, such components are gas nitrocarburised at 550 DEG C to 800 DEG C to produce an epsilon layer oxidised to produce an Fe3O4 layer not more than 1 micrometre thick, quenched into an oil/water emulsion, degreased and then wax coated. The steel components may be surface finished after nitrocarburising. A carburizing or carbonitriding or neutral atmosphere heat treatment is effected prior to nitrocarburising heat treatment heat treatment with both heat treatments being effected at above the pearlite to austenite transformation temperature.