Iron Nickel Cobalt Alloy Kovar

Iron-Nickel-Cobalt sealings alloy Kovar Description Kovar Alloy  is a vacuum melted, iron-nickelcobalt, low expansion alloy whose chemical composition  is controlled within narrow limits to assure precise uniform thermal expansion properties. Extensive  quality controls are employed in the manufacture of this alloy to ensure uniform physical and mechanical  properties for ease in deep drawing, coining, stamping and machining. Parameter Chemical Composition C P S Mn Si Cr Mo Ni Co Fe 0.03Max 0.020Max 0.020Max 0.50Max 0.30Max 0.20Max 0.20Max 28.5-29.5 16.8-17.8 Bal. Notes: 1.The shape and dimensions of the alloys are in compliance with ASTM F30 2. Content of cu 0.20(Max) Physical Property Density(g/cm3 8.36 Cure Temperature,°C 435 Resistivity (microhm-mm) 490 Thermal Conductivity W/m-K 17.3 Coefficient of Linear Expansion (average coefficient of linear expansion) Heat Treatment of the Sample 20-400ºC 20-450ºC Heat to temperature of 900±20℃ in the hydrogen,hold for 1h;re-heat to 1100±20℃, hold for 15 min.;cooled to 200℃ at a rate less than 5℃/min 4.6-5.2 5.1-5.5 Important NoticeChemical composition,Physical and Mechanical Properties will be engineered according to specific customer requirements.Therefore chemical composition,physical and Mechanical Properties might be different to values listed in this document. Information about product characteristics or applicability of materials are shown only for informative purposes. Sample PolicyThe samples are big enough (typically about 200mm in length for strip or plate) to get an understanding of the material characteristics, meanwhile custom-made sample available !        If you still have questions about the material , do not hesitate to contact Paul with any specific questions.