A Complete Guide To Invar 36 Bar

Invar 36 bar

Invar 36, also known as Alloy 36, is composed of an iron-nickel alloy known for its low coefficient of thermal expansion. Invar 36 is often utilized in precision instruments and devices and in electronics, aerospace, and nuclear industries for its unique thermo-mechanical properties. In this blog post, we will explore Invar 36 bars, what they are, and their applications.

What is Invar 36 Bar?

Invar 36 bars are available in round, flat, square, and hexagonal forms. They are made from a nickel-iron alloy with a low coefficient of thermal expansion, making it an ideal material for temperature-sensitive industries such as space and aeronautics. The bars can also come in different finishes, from cold-drawn and polished to centerless ground.

Properties and Characteristics

Invar 36 has a lot of properties that make it an excellent choice for various industries. Invar 36 bars have a very low coefficient of thermal expansion, meaning they do not undergo thermal expansion caused by heat. It also has high strength and toughness, making it suitable for applications requiring mechanical and thermal stress resistance. Another benefit of Invar 36 bars is their non-magnetic properties, which make them easier to handle and work with.


Invar 36 bars are widely used in different fields, including aerospace, communication, electronics, and scientific instrumentation. In the aerospace industry, Invar 36 bars are used to construct engines, instrumentation, and other equipment requiring precision tolerances. In electronics, it is used to produce semiconductor devices, such as transistors. It is also used in scientific instruments that require high precision, such as X-ray telescopes, laser cavities, and optical benches.

Machining and Welding

Invar 36 bars can be easily machined and welded using various techniques. However, it is best to perform machining and welding at room temperature to prevent warpage and distortion. Also, it is essential to clean the surfaces of Invar 36 bars before welding to avoid contamination during the process.


In summary, Invar 36 bar is a nickel-iron alloy composed of a low coefficient of thermal expansion, high strength, and non-magnetic properties. Invar 36 bars are used in various industries, including aerospace, electronics, and precision instruments. When working with Invar 36 bars, it is crucial to consider its unique properties and characteristics, such as low coefficient of thermal expansion and machinability. More so, Invar 36 bars are essential to the growth of various industries and, if utilized correctly, can increase efficiency and lower the chances of equipment failure.