Nilo K* Specification
*Trade name of Special Metals Group of Companies
- W.NR 1.3981
- UNS K94610
- AWS 094
Applicable Standards:
- ASTM F15
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.
Applications include:
- Glass to metal seals in applications requiring high reliability or resistance to thermal shock, ie. high power transmitting valves
| Approximate Chemical Composition | |
| Ni | 29% |
| Fe | 53% |
| Co | 17% |
| Properties | ||
| DENSITY | 8.16 g/cm3 | 0.295 lb/in3 |
| MELTING POINT | 1450oC | 2640oF |
| INFLECTION POINT | 450°C | 840°F |
| THERMAL CONDUCTIVITY | 16.7 W/m•°C | 116 btu•in/ft2•h°F |
| COEFFICIENT OF EXPANSION | 6.0 µm/m °C (20 - 100°C) 4.6-5.2 µm/m °C |
3.3 x 10-6 in/in
°F (70 - 212°F) 2.6-2.9 x 10-6 in/in
°F |
| HEAT TREATMENT (AFTER FORMING) |
|
The Nilo alloys are usually used in the
annealed condition Anneal at 850 - 1000°C (1560 - 1830°F) |
| CONDITION | APPROX TENSILE STRENGTH | APPROX SERVICE TEMPERATURE | ||
| Annealed | 450 - 550 N/mm2 | 65 - 80 ksi | up to 400oC | up to 750oF |
| Hard Drawn | 700 - 900 N/mm2 | 102 - 131 ksi | up to 400oC | up to 750oF |
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