Invar 36®

Invar 36® is a nickel / iron alloy notable for its low coefficient of thermal expansion (CTE), offering minimal dimensional changes when exposed to temperature fluctuations. Invar 36® is suitable for use together with high expansion alloys in applications such as bimetallic thermostats where motion is desired when temperature changes.

Properties

 The exceptionally low CTE of Invar 36® measures around 1.2 x 10^-6 per °C in the temperature range of -100°C to 200°C. This makes it extremely stable in environments with fluctuating temperatures. Its thermal expansion is approximately one-tenth that of carbon steel at temperatures up to 400°F (204°C).

Invar 36® is known for:

• High Dimensional Stability: Due to its low thermal expansion, Invar 36® maintains dimensional stability at varying temperatures, making it ideal for precision instruments. Find more about Low Expansion Alloys
• Magnetic Properties: It has ferromagnetic properties at lower temperatures, though its magnetic permeability decreases with rising temperature.
• Corrosion Resistance: Invar 36® offers good corrosion resistance, though it is not as resistant as stainless steel. It may require protective coatings in harsh environments.
• Appearance: dark, dull-gray color metal.
• Machinability: It can be machined with relative ease, though it tends to work-harden, so appropriate machining practices are necessary.

See the Invar 36® Properties Datasheet

Applications & Uses

Invar 36® is used in industries where precision, stability, and reliability are paramount. Here are some examples:

• Precision Instruments: Invar 36® is commonly used in scientific instruments, where dimensional stability is crucial.
• Aerospace and Defense: Its stability under varying temperatures makes it ideal for aerospace components, satellite structures, and applications in defense systems.
• Optical Devices: Used in optical mounting and support structures, especially where thermal expansion can affect the accuracy of optical systems.
• Electronic Applications: Invar 36® is used in the manufacturing of shadow masks for cathode ray tubes (CRTs) and other electronic components where precision is critical.
• Composite Tooling: Invar 36® is used in the tooling production for composite materials, particularly where molds need to maintain precise dimensions during heating and cooling cycles.
• Cryogenic Applications: Due to its stable properties at low temperatures, Invar 36® is used in cryogenic applications, including in the construction of containers and supports for liquefied gases.

Invar 36® Formats Supplied

Vulcan Metal Group supplies Invar 36® in bar rounds, billet flats, square, strip, and wire. We can make custom machined and finished parts supplied to print from materials we supply.

Request a quote for Invar 36® or Contact us for more information on how Vulcan Metal Group can help you.

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