Patent ID: 7270719

Claim:
A method of manufacturing a steel product, the method comprising: surface hardening a steel workpiece at a temperature region between about 450° C. and 500° C.; and simultaneously, while at the temperature region between about 450° C. and 500° C., applying a low static friction and wear-resistant coating by a physical vapor technique on a surface of the steel workpiece, wherein the coating consists essentially of diamond-like carbon with addition of tungsten carbide, wherein the steel workpiece is a stainless steel of the following composition (in weight %): Carbon max about 0.1 Nitrogen max about 0.1 Copper from about 0.5 to about 4 Chromium from about 10 to about 14 Molybdenum from 0.5 to about 6 Nickel from about 7 to about 11 Cobalt 0 to about 9 Tantalum max about 0.1 Niobium max about 0.1 Vanadium max about 0.1 Tungsten max about 0.1 Aluminum from about 0.05 to about 0.6 Titanium from about 0.4 to about 1.4 Silicon max 0.7 Manganese max 1.0 Iron balance.