Mahle International Gmbh

Mahle Metal Leve S/a

Gisela A Marques

Rodrigo Favaron

A piston ring for at least one of a piston of an internal combustion engine and a compressor may include at least one substantially annular metallic base having a nitrided layer. The base may include at least one chamfer and at least one outer surface that maintains contact with a layer of lubricating oil. The nitrided layer may exhibit a substantially constant thickness over at least one surface of the base and the at least one chamfer. The nitrided layer may include a nitrided diffusion layer that maintains direct contact with the layer of lubricating oil and has a residual tension ranging from +100 megapascal to &#x2212;100 megapascal.

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Jundiaí, Brazil

Gisela A Marques