Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy available in sheet,plate,rod,bar,tube,pipe,wire,etc. Kovar alloyType AnalysisElementMinMaxCarbon--0.02Nickel--29.0IronBalanceSilicon--0.20Manganese--0.30Cobalt--17.0DescriptionKovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise ...