Patent ID: 9316313
Filing Date: 2016-04-19
CPC Classification: B22D,C21D,C22C,F16J

Claim Text:
1. A method of manufacturing a piston ring formed of cast iron, comprising the steps of: providing an alloy including, in weight percent (wt. %) of the alloy, 2.2 to 2.9 wt. % carbon, 3.2 to 4.2 wt. % silicon, 0.75 to 1.25 wt. % copper, 1.0 to 1.5 wt. % manganese, 0.09 to 0.15 wt. % sulfur, and not greater than 0.1 wt. % phosphorous; casting the alloy; austenitizing the alloy; quenching the austenitized alloy; and tempering the alloy to form cast iron, wherein the cast iron comprises manganese sulfide (MnS) and carbides.