4j29 Kovar Alloy Round Bar Iron Nickel Cobalt Bright Surface
Product Description
Similar grades:
Chemical composition:
C≤0.03%
Mn≤0.50%
Si≤0.30%
P≤0.020%
S≤0.020%
Cu≤0.20%
Cr≤0.20%
Mo≤0.20%
Ni=28.5~29.5%
Co=16.8~17.8%
Fe=rest
Grade : Kovar nickel-cobalt ferrous alloy/ 29HK/ 4J29
Classification : the alloy of expansion characteristics
Kovar Alloy Bar Application: Kovar (trademark of CRS Holdings, inc., Delaware[1]) is a nickel-cobalt ferrous alloy compositionally identical to Fernico 1, designed to be compatible with the thermal expansion characteristics of borosilicate glass (~5 × 10?6 /K between 30 and 200 °C, to ~10 × 10?6 /K at 800 °C) in order to allow direct mechanical connections over a range of temperatures. It finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some lightbulbs.
Kovar Alloy Bar Chemical Composition in % Kovar
Ni 28,5-29,5% |
Fe 51,14-54,5% |
C 0.03% |
Si 0.3% |
Mn 0,4 % |
S o 0.015% |
P 0.015% |
o 17-18% |
Ti 0.1% |
Al 0.2% |
Cu 0.2% |
Cr 0,1 % |
Kovar Alloy Bar picture:
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