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% P% S% Mn% Si% Ni% Fe%
Invar 36 Max 0.05 Max 0.02 Max 0.02 0.20-0.60 Max 0.3 35.0-37.0 Bal.


UNS K93600

Werkstoff Nr.  1.3912


Strip/Sheet   ASTM B388/B753

Wire, bar, tube, forging are available

Physical Properties

Density: 8.1 g/cm3

Melting Point: 1430°C

Mechanical Properties

Invar 36 Strip tensile strength: 448-552 MPa

Invar 36 Strip yield strength: Min 241 MPa


Linear Coefficient of Thermal Expansion ā,10-6/℃

Grade 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

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