Razor blades

Details Razor blades Razor blades

1977-12-01

1979-12-25

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

75126C, 148135, 148156, C22C 3822

Patent

active

041804201

ABSTRACT:
The instant disclosure is concerned with martensitic stainless steel cutting edges such as razor blades which have superior corrosion resistance and which, although containing only between 0.30% to 0.45% carbon have hardnesses which are equal or better than cutting edges made from martensitic stainless steels containing 0.6% or more carbon which are widely sold commercially. Generally the blades are produced by treating them prior to hardening so that they will have a fine carbide microstructure comprising about 200 to about 500 carbides per 100 square microns, hardening them under conditions in which the fine microstructure will be substantially retained, i.e. subsequent to hardening they will still have about 200 to 500 carbides per 100 square microns, and forming the cutting edge.

REFERENCES:
patent: 3116180 (1963-12-01), Malzacher
patent: 3595643 (1971-07-01), Boyce et al.
patent: 3672877 (1972-06-01), Carlen et al.
patent: 3756865 (1973-09-01), Sastri
patent: 3826697 (1974-07-01), Carlen et al.
patent: 4021272 (1977-05-01), Asai et al.

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