Kovar (Alloy K) is a nickel-iron-cobalt controlled-expansion alloy containing 29% nickel. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Kovar (Alloy K) is used for glass-to-metal seals in applications requiring high reliability or resistance to thermal shock. Kovar (Alloy K) is used for high-power transmitting valves, transistor leads and headers, integrated-circuit lead frames, and photography flash bulbs.
Kovar(Alloy K):UNS K94610,1.3981
Technical Data Sheet
| Kovar Chemical Composition (Basic Density 8.36) | |||||||||||||
| Weight % | Ni | Fe | Co | C | Mn | Si | Al | Cr | Mg | Zr | Ti | Cu | Mo |
|
Alloy K Kovar |
29.0 | 53.0 | 17.0 | 0.04 max | 0.50 max | 0.20 | 0.10 max | 0.20 max | 0.10 max | 0.10 max | 0.10 max | 0.20 max |
0.20 max |
Typical Mechanical Properties
| Material | Condition | Yield Strength (0.1% Offset) | Tensile Strength | Elongation % | ||
| psi | MPa | psi | MPa | |||
|
Alloy K Kovar |
Annealed | 49,000 | 340 | 75,000 | 520 | 42 |
Availability
Alloy K / Kovar is available in Bar, Rod, Tube, Sheet, Strip, Coil, Plate and Wire. For all stock availability contact Sales for further availability.
| Model | GB | ASTM | DIN | BS | AFNOR | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| New grades | Old grades | ||||||||||
| 4J36（Invar 36) | UNS K93600 | W.Nr.1.3912 | X1NiCrMoCu | Fe-Ni36 | |||||||
| Kovar(Alloy K) | UNS K94610 | 1.3981 | |||||||||
| Alloy 42 | UNS K94100 | 1.3917 | |||||||||
- Stainless Steel Sheet/Plate
- Stainless Steel Pipe/Tube
- Stainless Steel Bar/Rod
- Stainless Steel Coil
- Stainless Steels
- Nickel Based Alloys
- High Strength Steels
- Pressure Vessel, Cryogenic, Pipe & Construction Steels
- Steels For Molds Tools And Die
-
Tailor Made Products
- Wear Resistant Steels
-
Protection Steel