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Super Invar® 32‑5: Ultra‑Low Thermal Expansion Alloy for Precision Engineering

Super Invar 32-5 is a low expansion alloy consisting of 32% nickel, 5% cobalt, and balance iron. Super Invar Alloy exhibits minimum thermal expansion at room temperatures (one half of Invar Alloy), as well as thermal expansion properties less than that of Invar Alloy in the 67/203°F (-55/95°C) temperature range.

Properties

General

PropertyTemperatureValue

Density

23.0 °C

8.15 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

23.0 °C

145 GPa

Elongation

23.0 °C

40 %

in 2 in.

Hardness, Rockwell B

23.0 °C

75 [-]

Tensile strength

23.0 °C

483 MPa

Yield strength

23.0 °C

276 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

8.4E-7 1/K

from 20°C to the mentioned temperature

150.0 °C

1.17E-6 1/K

from 20°C to the mentioned temperature

200.0 °C

1.72E-6 1/K

from 20°C to the mentioned temperature

250.0 °C

2.53E-6 1/K

from 20°C to the mentioned temperature

300.0 °C

4.16E-6 1/K

from 20°C to the mentioned temperature

350.0 °C

5.74E-6 1/K

from 20°C to the mentioned temperature

400.0 °C

7.03E-6 1/K

from 20°C to the mentioned temperature

500.0 °C

8.99E-6 1/K

from 20°C to the mentioned temperature

550.0 °C

1.06E-5 1/K

from 20°C to the mentioned temperature

700.0 °C

1.16E-5 1/K

from 20°C to the mentioned temperature

800.0 °C

1.22E-5 1/K

from 20°C to the mentioned temperature

900.0 °C

1.3E-5 1/K

from 20°C to the mentioned temperature

Melting point

1427 °C

Specific heat capacity

23.0 °C

502 J/(kg·K)

Thermal conductivity

23.0 °C

10 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

23.0 °C

8.2E-7 Ω·m

Magnetic

PropertyValue

Curie temperature

245 °C

Chemical properties

PropertyValue

Carbon

0.05 %

Chromium

0.25 %

Cobalt

5 %

Iron

Balance

Nickel

32 %

Silicon

0.25 %

Sulfur

0.015 %

Technological properties

Property
Application areas

Common applications of Super Invar 32-5 are: Optical instruments . Telescopes . Laser instruments and equipment . Ring laser gyroscopes . Laser benches . Positioning devices . Metrology devices . Structural components . Substrates in instrument systems requiring precision measurements


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