Steel composition 

Patent No. 6,680,129

Issued: January 20, 2004
Filed: October 28, 2002

Inventors: Wang; Yumin (Ithaca, NY); Hanayama; Yoshito (Ithaca, NY); Fornell; Doug (Ithaca, NY); Tada; Naosumi (Mie, JP); Mishima; Kunihiko (Mie, JP)
Assignee: BorgWarner Inc. (Auburn Hills, MI)

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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