A Nickel-Iron, low expansion alloy containing 36% Nickel. It maintains near constant dimensions over the range of normal atmospheric temperatures and has a low coefficient of expansion from cryogenic temperatures to about 500oC (930oF). Nilo 36 also retains good strength and toughness at cryogenic temperatures.
Nilo® 36 is also known as Invar / Invar 36, Supra 36, and Pernifer 36.
| Element | Min % | Max % |
| Ni | 35.00 | 38.00 |
| Fe | bal | |
| C | – | 0.10 |
| Mn | – | 0.60 |
| P | – | 0.025 |
| S | – | 0.03 |
| Si | – | 0.35 |
| Cr | – | 0.50 |
| Mo | – | 0.50 |
| Co | – | 1.00 |
Density
8.11 g/cm³ | 0.293 lb/in³
Melting Point
1430°C | 2610°F
Coefficient of Expansion
220°C | 430°F
Modulus of Rigidity
10.0 W/m•°C | 69.3 btu•in/ft2•h°F
Modulus of Elasticity
1.5 µm/m °C (20 – 100°C) 2.6 µm/m °C (20 – 200°C) | 0.83 x 10-6 in/in °F (70 – 212°F) 1.4 x 10-6 in/in °F (70 – 392°F)
Heat Treatment of Finished Parts
| Type | Temperature | Time (Hr) | Cooling | ||
| °C | °F | ||||
| Anneal | 850 – 1000 | 1560 – 1830 | 0.5 | Air or water | |
| For highest dimensional stability | 830 300 100 |
1525 570 212 |
0.5 1 48 |
Water Water Air |
|
Properties
| Condition | Approx. tensile strength | Approx. operating temperature | ||
| N/mm² | ksi | °C | °F | |
| Annealed | 450 – 550 | 65 – 80 | up to +500 | up to +930 |
| Hard Drawn | 700 – 900 | 102 – 131 | up to +500 | up to +930 |