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 |
| 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 | ||
| a/10-6·K-1 | 200-300℃ | 20-400℃ | 20-450℃ |
| / | 4.6-5.2 | 5.1-5.5 |
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