Alloy 42
1.3917 / UNS K94100
A binary nickel-iron alloy containing 42% nickel. It has a low coefficient of thermal expansion (CTE) over the temperature range 20-300°C. Due to this stable CTE it is widely used as tooling for the production of carbon-fibre composites for aerospace and autosport applications. It is used for glass sealing applications in electronic components and vacuum devices, for thermostat rods and in thermostatic bimetallic strip.
Stock program
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| Fe | Balance | |
| Ni¹ | 42.00 % | |
| Co | max. | 1.00 % |
| Mn | max. | 0.80 % |
| Si | max. | 0.30 % |
| Cr | max. | 0.25 % |
| Al | max. | 0.15 % |
| C | max. | 0.05 % |
| S | max. | 0.035 % |
| P | max. | 0.025 % |
¹ Nominal value; adjusted to meet expansion requirements.
| g/cm³ | 8.11 | |
| lb/in³ | 0.293 |