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US 6,485,026 B1Granted
Non-stainless steel nitrided piston ring, and method of making the same
AssigneeDana Corporation
InventorsHélène Hubert, Chantal Gral
Life of this patent
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Abstract
A piston ring is broadly defined as a ring-shaped, non-stainless steel, iron alloy that is nitrided, and includes between about 1% and about 10% chromium by weight, and preferably includes between about 1% and about 2% chromium by weight, with additional alloying elements also included.
Claims2
A piston ring, which comprises:
- a ring-shaped iron alloy that is nitrided, wherein said iron alloy comprises chromium at about 1.4% by weight, manganese at about 1% by weight, molybdenum at about 0.9% by weight, vanadium at about 0.2% by weight, carbon at about 0.2% by weight, silicon at about 0.1% by weight, phosphorus at about 0.02% by weight, and sulfur at about 0.004% by weight.
A method of manufacturing a piston ring, which comprises:
- forming a nitrided ring of an iron alloy, wherein said iron alloy comprises chromium at about 1.4% by weight, manganese at about 1% by weight, molybdenum at about 0.9% by weight, vanadium at about 0.2% by weight, carbon at about 0.2% by weight, silicon at about 0.1% by weight, phosphorus at about 0.02% by weight, and sulfur at about 0.004% by weight.
Dependencies are inferred from the claim text.