High modulus wear resistant gray cast iron for piston ring applications
US9316313B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Jun 17, 2015 |
| Grant date | Apr 19, 2016 |
| Priority date | — |
| Expiry date | Jun 17, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C37/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piston ring formed of cast iron provides improved machinability and exceptional performance and minimum costs. The cast iron includes 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, not greater than 0.2 wt. % phosphorous, and an average carbon equivalent of 3.8. The cast iron preferably includes a matrix of martensite with MnS and carbides dispersed therein. The matrix is also preferably free of ferrite, austenite, and steadite. The cast iron is formed by casting, austenitizing, quenching, and tempering the alloy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.