Steel piston ring alloy containing manganese, chromium, iron and other specified elements, is annealed and rapidly nitrided on mandrel before finishing

摘要

In wt%, conventional content: Mn up to 2, Cr 1-8, remainder Fe, is complemented by: C 0.25-0.65, Si up to 2.0, P up to 0.030, S up to 0.030, Mo up to 1.5, Al up to 1.5, V up to 0.35. An independent claim is included for the method of piston ring manufacture. A coiled, soft-annealed wire of the alloy is prepared. The ring is formed, separating the wire. It is annealed on a mandrel, nitriding it at the same time in a nitrogen-delivery medium. The ring is finished.