A Nickel-Iron, low expansion alloy containing 42% Nickel. It has a low and nominally constant coefficient of thermal expansion from room temperature to about 300oC (570oF).
Nilo® 42 is also known as Invar 42, Pernifer 40, Dilaton 42, and Glass Sealing 42.
| Chemical Composition | Specifications | Designations | Key Features | Typical Applications | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
ASTM F30 | W.NR 1.3917 UNS K94100 AWS 091 |
Low and nominally constant coefficient of thermal expansion from room temperature to about 300°C (570°F). | Semiconductor lead frames Thermostat rods Various glass to metal seals |
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| Density | 8.11 g/cm³ | 0.293 lb/in³ |
| Melting Point | 1435°C | 2615°F |
| Inflection Point | 370°C | 700°F |
| Thermal Conductivity | 10.5 W/m•°C | 72.8 btu•in/ft2•h°F |
| Coefficient of Expansion | 5.3 µm/m °C (20 – 100°C) 4.5 – 6.5 µm/m °C (20 – 300°C) |
2.9 x 10-6 in/in °F (70 – 212°F) 2.5 – 3.6 x 10-6 in/in °F (70 – 572°F) |
| Heat Treatment of Finished Parts The Nilo alloys are usually supplied and used in the annealed condition (residual cold work distorts the coefficients of thermal expansion). Annealing times may vary due to section thickness. |
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|---|---|---|---|---|---|
| Type | Temperature | Time (Hr) | Cooling | ||
| °C | °F | ||||
| Anneal | 850 – 1000 | 1560 – 1830 | 0.5 | Air or water | |
| Properties | ||||
|---|---|---|---|---|
| Condition | Approx. tensile strength | Approx. operating temperature | ||
| N/mm² | ksi | °C | °F | |
| Annealed | 450 – 550 | 65 – 80 | up to +300 | up to +570 |
| Hard Drawn | 700 – 900 | 102 – 131 | up to +300 | up to +570 |
The above tensile strength ranges are typical. If you require different please ask.
*Trade name of Special Metals Group of Companies
