Alloy 42（UNS K94100）

Alloy 42, also known as Invar 42 or FeNi42, is a nickel-iron alloy that is primarily composed of approximately 58% iron and 42% nickel. It is known for its low thermal expansion coefficient, which makes it particularly useful in applications requiring dimensional stability over a range of temperatures.

Physical Properties

AVAILABLE PRODUCTS AND SPECIFICATIONS

Features

Low Thermal Expansion: Alloy 42 has a very low coefficient of thermal expansion, making it ideal for applications where precise dimensional stability is critical.

Magnetic Properties: It exhibits good magnetic properties, which can be advantageous in certain electromagnetic applications.

Good Machinability: Alloy 42 can be easily machined and formed, allowing for versatile applications in manufacturing.

Corrosion Resistance: While not as corrosion-resistant as some stainless steels, it still offers decent resistance in certain environments.

Applications:

• Precision Instruments: Used in the manufacturing of measuring instruments and devices that require high accuracy.
• Electronics: Employed in components where thermal stability is essential, such as in electronic housings and connectors.
• Aerospace and Defense: Utilized in various aerospace applications where dimensional stability is critical under temperature changes.

Advantages

• Dimensional Stability: Offers excellent dimensional stability across a wide temperature range, making it ideal for applications requiring high precision.
• High Efficiency: In applications like motors and transformers, Alloy 42 can help reduce size and weight while maintaining performance.
• Versatility: Its combination of magnetic and thermal properties makes it suitable for a wide range of industrial applications.

Limitations

• Electrical Resistivity: With a low resistivity (around 0.27 μΩ·m), it may not be suitable for high-frequency applications where higher resistivity is preferred.
• Cost: The cost of nickel can make this alloy more expensive compared to other materials, which may be a consideration for large-scale applications.