Kovar is a nickel-cobalt ferrous alloy which finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some light blubs.
Equivalent alloy: 4J29 (China), 29HK(Russia), Kovar, Rodar (US), Nilo K(UK), KV-1,KV-2,KV-3(Japan), Vacon 12, Silvar 48(Germany)
Physical Properties
Density | 8.17 g/cm3 |
Melting point | 1450℃ |
Chemical composition
% | C | Mn | Si | P | S | Cu | Cr | Mo | Ni | Co | Fe |
min | 28.5 | 16.8 | Bal. | ||||||||
max | 0.03 | 0.5 | 0.3 | 0.020 | 0.020 | 0.20 | 0.20 | 0.20 | 29.5 | 17.8 |
Designation | Standard |
Sealing alloy | ASTM F15 |
UNS K94610 |
