Razor blade steel having high corrosion resistance and different

Details Razor blade steel having high corrosion resistance and different Razor blade steel having high corrosion resistance and different

1991-03-12

1994-01-04

Dean, R.

Metal treatment

Stock

Ferrous

148326, 420 34, 420 67, 3034654, C22C 3822

Patent

active

052756726

ABSTRACT:
Steel which is particularly useful for making a razor blade of high corrosion resistance contains more than 0.45%, but less than 0.55%, of carbon, 0.4 to 1.0% of silicon, 0.5 to 1.0% of manganese, 12 to 14% of chromium and 1.0 to 1.6% of molybdenum all by weight, in addition to iron and inevitable impurities, and has a carbide density of 100 to 150 particles per 100 square microns as annealed. The razor blade has a Vickers hardness of at least 620 and a carbide density of 10 to 45 particles per 100 square microns, and preferably has a specific distribution of residual austenite content. The improved properties of the razor blade are achieved by an improved process of heat treatment which includes austenitizing the steel at a temperature of 1075.degree. C. to 1120.degree. C., cooling it to a temperature between -60.degree. C. and -80.degree. C. for hardening it, and tempering it at a temperature of 250.degree. C. to 400.degree. C.

REFERENCES:
patent: 3575737 (1971-04-01), Carlen et al.
patent: 4180420 (1979-12-01), Sastri et al.

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