A Nickel-Iron, controlled expansion alloy containing 48% Nickel. Its coefficient of thermal expansion was designed to match that of soft lead and soda-lime glasses. This alloy also has a high inflection point.
Nilo® 48 is also known as Invar 48 and Magnifer 50.
| Chemical Composition | Specifications | Designations | Key Features | Typical Applications | ||||||||||||||||||||||||||||||
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ASTM F30 | W.NR 1.3922 W.NR 1.3926 W.NR 1.3927 UNS K94800 AWS 092 |
Coefficient of thermal expansion designed to match that of soft lead and soda-lime glasses. High inflection point. |
Industrial thermostats that operate at temperatures up to 450°C (840°F). Glass to metal seals |
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| Density | 8.2 g/cm³ | 0.296 lb/in³ |
| Melting Point | 1450°C | 2640°F |
| Inflection Point | 460°C | 860°F |
| Thermal Conductivity | 16.7 W/m•°C | 116 btu•in/ft2•h°F |
| Coefficient of Expansion | 8.5 µm/m °C (20 – 100°C) 8.3 – 9.3 µm/m °C (20 – 300°C) |
4.7 x 10-6 in/in °F (70 – 212°F) 4.6 – 5.2 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 +450 | up to +840 |
| Hard Drawn | 700 – 900 | 102 – 131 | up to +450 | up to +840 |
The above tensile strength ranges are typical. If you require different please ask.
*Trade name of Special Metals Group of Companies
