Invar Alloys

Invar Alloys


Ratnam Steel is a distributor of various Invar Alloy Grades and Conditions in any size or form as shown below. Invar is a nickel iron alloy well known for its uniquely low coefficient of thermal expansion and is used where high dimensional stability is required, such as clocks, precision instruments, seismic creep gauges, valves in motors, and antimagnetic watches.  Check availability with our sales department to see if Ratnam Steel can provide your metal requirement.

Grades Available

Invar 36
Invar 42

Physical Constants

Density: 0.291 lb/in³ or 8.55 g/cm³
Melting Range: 2600 °F or 1427 °C


~ Extremely low expansion around ambient temperatures

Forms & Shapes Available

Invar Coils / Invar Foils / Invar Strips: Flat Rolled
Invar Extrusions
Invar Fasteners
Invar Fittings
Invar Flanges
Invar Rectangular Flat Bars
Invar Forgings
Invar Half Oval Bars
Invar Half Round Bars
Invar Hexagonal Bars
Invar Mesh
Invar Pipes
Invar Plates
Invar Octagonal Bars
Invar Pipes
Invar Plates
Invar Rings
Invar Sheets
Invar Square Bars
Invar Threaded Bars / Rods
Invar Tubes
Invar Wire