General Description

Invar 36, also known as FeNi36, is iron-nickel alloys have low coefficients of expansion over only a rather narrow range of temperature. It has a low coefficient of expansion from cryogenic temperatures to about 260℃. In the dry air at home temperature, invar 36 has good resistance to corrosion. But in moist air, it may go corrosion.

Invar 36 is suitable for the applications who require low coefficient of expansion, such as production, storage and transportation of liquid gas, temperature regulation devices working below 200℃, aperture mask, unit frameworks working below -200℃ and so on.

Chemical Composition

Grade C% Si% P% S% Mn% Ni% Fe%
Invar 36 Max 0.05 Max 0.30 Max 0.020 Max 0.020 0.20-0.60 35.0-37.0 Bal.


Grade UNS Werkstoff Nr. Strip/Sheet
Invar 36 K93600 1.3912 ASTM B388/B753

Physical Properties

Grade Density Melting Point
Invar 36 8.1 g/cm3 1430°C

Coefficient of Expansion

Alloy Linear Coefficient of Thermal Expansion ā,10-6/℃
20-50℃ 20-100℃ 20-200℃ 20-300℃ 20-400℃ 20-500℃
Invar 36 0.6 0.8 2.0 5.1 8.0 10.0

Size Range

Invar 36 wire, bar, rod, strip, forging, plate, sheet, tube, fastener and other standard forms are available.

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