Alloy Wire International
Datasheet: Nilo® 42
Nilo® 42
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 300°C (570°F).
Nilo® 42 is also known as Invar 42, Pernifer 40, Dilaton 42, and Glass Sealing 42.
Available in all profile options
Key Features
Low and nominally constant coefficient of thermal expansion from room temperature to about 300°C (570°F).
Typical Applications
Semiconductor lead frames
Thermostat rods
Various glass to metal seals
Designations
W.NR 1.3917
UNS K94100
AWS 091
Specifications
ASTM F30
Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| Ni | 41.00 nominal | |
| Fe | bal | |
| Mn | – | 0.80 |
| Si | – | 0.30 |
| C | – | 0.05 |
| Cr | – | 0.25 |
| P | – | 0.03 |
| S | – | 0.03 |
| Al | – | 0.10 |
Alloy Details
| Density | Melting Point | Inflection Point | Thermal Conductivity | Coefficient of Expansion |
|---|---|---|---|---|
| 8.11 g/cm³ | 1435 °C | 370 °C | 10.5 W/m• °C | 5.3 µm/m °C (20 – 100 °C) 4.5 – 6.5 µm/m °C (20 – 300 °C) |
| 0.293 lb/in³ | 2615 °F | 700 °F | 72.8 btu•in/ft2•h °F | 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.
| Type | Temperature | Time | Cooling |
|---|---|---|---|
| Anneal | 850 – 1000 °C (1560 – 1830 °F) | 0.5 Hr | Air or water |
Properties
| Annealed | ||
|---|---|---|
| Approx. tensile strength | <600 N/mm² | <87 ksi |
| Approx. operating temperature | up to +300 °C | up to +570 °F |
| Hard Drawn | ||
|---|---|---|
| Approx. tensile strength | 700 – 900 N/mm² | 102 – 131 ksi |
| Approx. operating temperature | up to +300 °C | up to +570 °F |
The above tensile strength ranges are typical. If you require different please ask.
*Trade name of Special Metals Group of Companies
