INVAR 32-5

Descriptions of INVAR 32-5Molybdenum-Lanthanum-Wire

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.

The minimal expansion of Super Invar over this range of temperatures, makes this alloy useful in many applications including structural components and substrates in instrument systems requiring precision measurements.

Chemical Composition

The chemical composition of invar 32-5 is outlined in the following table.

Elements Content (%)
Iron, Fe 62
Nickel, Ni 32
Cobalt, Co 5.5
Manganese, Mn 0.4
Silicon, Si 0.25


Physical Properties

The following table shows the physical properties of Invar 32-5.

Properties Metric Imperial
Density 8.14 g/cm³ 0.294 lb/in³
Melting point 1455°C 2650°F


Mechanical Properties

The mechanical properties of Invar 32-5 are given in the following table.

Properties Metric Imperial
Tensile strength 483 MPa 70000 psi
Yield strength 276 MPa 40000 psi
Modulus of elasticity 145 GPa 21000 ksi
Poisson’s ratio 0.23 0.23
Elongation at break (in 2 in. (50.8 mm)) 40% 40%
Hardness, Rockwell B (annealed) 75 75
Hardness, Rockwell B (cold worked) 90 90
Machinability 25 25

Thermal Properties

The thermal properties of Invar 32-5 are displayed in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@ -55 – 95°C/-67to -203°F) 0.630 µm/m°C 0.350 µin/in°F

INVAR 32-5 Available Forms:

Super Invar Rod: 0.50" – 3.50"
Super Invar Sheet: 0.039" – 0.118"
Super Invar Plate: 0.50" – 2.50"

Specifications of INVAR 32-5

  • AISI 670
  • AMS 5537
  • AMS 5759
  • AMS 5796
  • ASTM F90
  • GE B50T26
  • GE B50TF1
  • MIL C-24252 Comp 1
  • UNS R30605

Applications of INVAR 32-5

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

Packaging of INVAR 32-5

Our INVAR 32-5 is carefully handled to minimize damage during storage and transportation and to preserve the quality of the product in its original condition.

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