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Alloy 36 (Invar®) Controlled Expansion Alloy

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1.3912 (FeNi36) is a 36% nickel-iron alloy. It exhibits a near zero rate of thermal expansion from around –100°C up to 200°C. This is around a tenth of the expansion rate of carbon steels. Alloy 36 also demonstrates a high retention of strength and toughness at cryogenic temperatures, making it suitable for a variety of low temperature or low expansion applications. The alloy is ideally suited to areas where dimensional changes due to temperature must be minimal, such as tooling for aerospace composites, radio and electronic devices and structural members in precision equipment such as lasers, measuring devices, thermostats and cryogenic instrumentation. Alloy 36 can also be utilised in combination with a high expansion material to crate mechanical movement with temperature in thermomechanical controls and switchgear.

Related Standards

Equivalent Materials

This material data has been provided by Matmatch.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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23.0 °C

8.13 g/cm³

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Elastic modulus

23.0 °C

140 GPa

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23.0 °C

30 %

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Hardness, Vickers

23.0 °C

140 [-]

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Tensile strength

23.0 °C

480 MPa

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Yield strength

23.0 °C

310 MPa

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Coefficient of thermal expansion

30.0 °C

1.2E-6 1/K

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150.0 °C

2.7E-6 1/K

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Melting point

1450 °C

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Specific heat capacity

23.0 °C

510 J/(kg·K)

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Thermal conductivity

23.0 °C

10.5 W/(m·K)

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Chemical properties



63 %

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0.6 %

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36 %

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0.4 %

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Technological properties

Application areas

General: Positioning devices, bimetal thermostats, advanced composite moulds for aerospace industry, optical devices, echo boxes and filters for mobile telephones, magnetic shielding, small electrical transformers, metrology devices, scientific instruments, electrical circuit breakers, temperature regulators, clock balance wheels, pendulum clocks, precision condenser blades, radar and microwave cavity resonators, special electronic housings, seals, spacers, and specialized frames, high voltage transmission lines