Alloy Wire International
Datasheet: Nilo® 48
Nilo® 48
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 often used in industrial thermostat rods up to 450°C (840°F) and for glass-to-metal seals in a number of applications, which may include radio valves and electric lamps.
Nilo® 48 is also known as Invar 48 and Magnifer 50.
Available in all profile options
Key Features
Nilo® 48 offers the following key features:
Coefficient of thermal expansion designed to match that of soft lead and soda-lime glasses.
High inflection point.
Typical Applications
Nilo® 48 is known to be suitable for the following applications:
Industrial thermostats that operate at temperatures up to 450°C (840°F).
Glass to metal seals
Designations
W.NR 1.3922
W.NR 1.3926
W.NR 1.3927
UNS K94800
AWS 092
Specifications
ASTM F30
Chemical Composition
The chemical composition of Nilo® 48 is indicated in the table below:
| Element | Min % | Max % |
|---|---|---|
| Ni | 48.00 nominal | |
| Fe | bal | |
| Mn | – | 0.80 |
| Si | – | 0.30 |
| C | – | 0.05 |
| Cr | – | 0.25 |
| P | – | 0.025 |
| S | – | 0.03 |
| Al | – | 0.10 |
Alloy Details
Nilo® 48 density, melting point, inflection point, thermal conductivity, and coefficient of expansion is indicated in the table below:
| Density | Melting Point | Inflection Point | Thermal Conductivity | Coefficient of Expansion |
|---|---|---|---|---|
| 8.2 g/cm³ | 1450 °C | 460 °C | 16.7 W/m• °C | 8.5 µm/m °C (20 – 100 °C) 8.3 – 9.3 µm/m °C (20 – 300 °C) |
| 0.296 lb/in³ | 2640 °F | 860 °F | 116 btu•in/ft2•h °F | 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.
The typical heat treatment of Nilo® 48:
| Type | Temperature | Time | Cooling |
|---|---|---|---|
| Anneal | 850 – 1000 °C (1560 – 1830 °F) | 0.5 Hr | Air or water |
Properties
The typical mechanical properties of Nilo® 48:
| Annealed | ||
|---|---|---|
| Approx. tensile strength | <600 N/mm² | <87 ksi |
| Approx. operating temperature | up to +450 °C | up to +840 °F |
| Hard Drawn | ||
|---|---|---|
| Approx. tensile strength | 700 – 900 N/mm² | 102 – 131 ksi |
| Approx. operating temperature | up to +450 °C | up to +840 °F |
The above tensile strength ranges are typical. If you require different please ask.
*Trade name of Special Metals Group of Companies
