Piston ring and process for manufacturing the same

Details Piston ring and process for manufacturing the same Piston ring and process for manufacturing the same

1992-07-15

1994-03-08

Yee, Deborah

Metal treatment

Stock

Carburized or nitrided

148230, 148212, C21D 106

Patent

active

052923819

ABSTRACT:
The object of the present invention is to provide a piston ring which is free from occurrence of cracks on the nitrided layer and having enhanced abrasion resistance and fatigue strength, and to provide a process for manufacturing the piston ring. In the invention, a surface of the steel body is subjected to a two-stage nitriding treatment consisting of low-temperature nitriding and high-temperature nitriding. A white layer on the slidable surface along the inner periphery surface of a cylinder is removed, and a white layer on each of the upper and lower surfaces and the corner portions each being adjacent to the slidable surface is removed to have a thickness of not more than 5 .mu.m.

REFERENCES:
patent: 2390417 (1945-12-01), Bramberry

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