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Kovar 4J29 Nickel Alloy

The Kovar nickel alloy supplied by XINHUA has similar linear expansion coefficient with borosilicate (or Pyrex) over a range of temperatures (20℃~450℃), enabling it to be compatible with the thermal expansion characteristics of hard glass so as to achieve hermetic seals.

Oxidation film densification allows this iron-nickel-cobalt alloy to be readily welded and excellent plasticity makes it fabricable. Wide applications are power tubes, vacuum tubes, transmitting tubes, kinescopes, switch tubes, transistors, relay housing, etc.

Specifications
GB/T ASTM UNS W. Nr
4J29 F15 K94610 1.3981
Chemical Compositions of Kovar Nickel Alloy
Composition Ni Cr Fe Co Cu C Mn Si P S Mo
Content (%) Min. 28.5 Bal. 16.8
Max. 29.5 0.2 17.8 0.20 0.03 0.50 0.30 0.02 0.02 0.20
Coefficient of Linear Expansion
a/10-6·K-1 200-300℃ 20-400℃ 20-450℃
/ 4.6-5.2 5.1-5.5
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