To improve wear resistance of a pin for a chain under a high surface pressure.
Double vanadium carbide layers comprising a layer containing VxC (wherein, x is 1-2) as a main component and a layer containing VyC (wherein, x>y; and y≤1) are formed from an outside on the outermost surface part of carbon steel or alloy steel being base material, e.g., steel to be used as a base material of the pin for a chain. In this case, exfoliation from the surface layer of the carbide layers can be prevented since the carbide layers formed in the outermost surface part of the base material contains double vanadium carbides of VxC (wherein, x is 1-2) and VyC (wherein, y<x) as main components. Further, when a chromium carbide layer containing a relatively large amount of chromium is formed between the carbide layers and the base material as a boundary layer, the bonding force between the the carbide layers and the base material is enhanced across the boundary layer. Thereby, the exfoliation of the carbide layers from the base material can be prevented. Thus, the wear resistance of the pin can be improved even under a high surface pressure.
YOSHIKAWA RIHEI
KAWAMURA MEITEN
FUJIWARA AKIRA
HONDA MOTOR CO LTD
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