Super Invar 32-5 ®

Technical Data Sheet


Chemical Composition Limits
Weight% C Si Co Mn Ni Fe
Super Invar 32-5 0.02 0.25 5.50 0.40 32 Bal

Super Invar 32-5 is a magnetic, austenitic, solid solution alloy containing iron, nickel and cobalt. 32-5 was originally designed to provide minimum thermal expansion at room temperatures. It has the austenite stability to service temperatures at least -67°F (-55°C). Super Invar 32-5 has less thermal expansion properties than Invar 36.

Super Invar 32-5 is used in structural components for supports and substrates in optical and laser systems requiring precision measurements.

Typical Mechanical Properties


Material 0.2% Yield Strength Ultimate Tensile Strength Hardness Rockwell B
Hardness Rockwell B
Cold Worked
ksi MPa ksi MPa
Super Invar 32-5 40 276 70 483 75 90

Technical Data

Physical Properties
Specific Gravity - 8.15
Density - 0.2940 lb/in ³
Mean CTE - -67 to 203°F / 0.350 x 10-6 in/in°F

Super Invar 32-5 is available in bar, bar flats, bar square, bar rounds, strip, billet, wire. For all stock availability contact Sales for further availability.

At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (, the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

Our expertise in global logistics enables us to source material from anywhere in the world in a matter of days and provide fast shipping solutions to all our customers, whichever country they are in. We use a range of transport partners to ship overnight within the UK and Europe, and offer a full range of logistics solutions from priority express services to more cost-effective economy shipments all around the globe. To find out more about our services click here.

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.