Material
Super-Invar (4J32)
Super-Invar (4J32) is an iron-nickel-cobalt precision alloy with the lowest thermal expansion of the Invar family, ideal for ultra-precision dimensional stability.
Manufacturing processes
CNC
About
Super-Invar (4J32) is a Fe-Ni-Co alloy with an even lower coefficient of thermal expansion than standard Invar 36, though this ultra-low expansion only holds within a limited range (roughly -60 °C to +80 °C). It has good plasticity and machinability similar to austenitic alloys, but poor thermal conductivity, and its composition must be tightly controlled or expansion performance degrades.
Super-Invar is suitable for precision instruments, resonant cavities, standard length scales, and astronomical instrument frames.
Technical Details
- Accuracy
- ±0.2% (lower limit of ±0.13 mm)
- Density
- 8.1 g/cm³
- Min. wall thickness
- -
Technical Properties
- Embossing
- min. 5.3 mm
- Engraving
- min. 0.3 mm
- Warping risk
- N/A