Steel composition
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United States of America Patent
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Jan 20, 2004
Grant Date -
N/A
app pub date -
Oct 28, 2002
filing date -
Jun 29, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Chain parts and other steel articles are provided with hard, wear-resistant carbide coatings by tumbling them in a heated retort with a particulate mix which includes a source of vanadium and/or niobium. The steel substrate comprises a steel having at least 0.2% carbon, preferably 0.7-1.2%. Where the chromium content of the steel is 4-12%, preferably 4-8%, the chemical deposition process includes drawing a small amount of chromium from the steel substrate into the vanadium or niobium carbide coating, where it is distributed substantially homogeneously, helping to provide adhesion strength to the coating.
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