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4J32 Super-Invar Low Expansion Alloy -60~80°C lower expansion rate than 4J36
4J32 is also called Super-Invar. It has a lower expansion coefficient than 4J36 within temperature range -60~80°C. It is mainly used to make instrument parts which requires high presicion in enviornment temperature range.
Chemical composition
| Element | C | P | S | Si | Mn | Cu | Co | Ni | Fe |
| Weight(%) | 0.05 max | 0.02 max | 0.02 max | 0.02 max | 0.20~0.60 | 0.40~0.80 | 3.2~4.2 | 31.5~33.0 | Rem |
Spec
YB/T 5241-2005 Alloy with expansion
| Mean Coefficient of Linear Expansion | 20~50°C | 20~100°C | 20~150°C | 20~200°C | 20~250°C | 20~300°C | 20~400°C | 20~500°C |
| 4J32 | 0.5 | 0.9 | 1.4 | 2.0 | 3.2 | 4.9 | 7.7 | 9.6 |
