Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1993-10-15
1995-07-18
Kastler, Scott
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148607, 148608, 148325, 148326, 420 34, 420 67, C21D 604, C22C 3822
Patent
active
054338018
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
patent: 4180420 (1979-12-01), Sastri et al.
Althaus Wolfgang
Kumagai Atsushi
Ip Sikyin
Kastler Scott
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