Physical and mechanical properties
| Nifethal®70 | Nifethal®52 | ||
| Max continuous operating temp. | °C | 600 | 600 |
| (element temperature in air) | °F | 1110 | 1110 |
| Nominal composition (See Note), % | Cr | – | – |
| Al | – | – | |
| Fe | balance | balance | |
| Ni | 72 | 52 | |
| Density ρ | g/cm3 | 8.45 | 8.20 |
| Ib/in3 | 0.305 | 0.296 | |
| Resistivity at 20°C | Ω mm2/m | 0.20 | 0.376 |
| at 68°F | Ω/cmf | 120 | 220 |
| Temperature factor of the resistivity, Ct | |||
| 250°C (480°F) | 2.19 | 1.93 | |
| 500°C (930°F) | 3.66 | 2.77 | |
| 800°C (1470°F) | – | – | |
| 1000°C (1830°F) | – | – | |
| 1200°C (2190°F) | – | – | |
| Linear thermal expansion coefficient α, × 10-6/K | |||
| 20 – 100°C (68 – 210°F) | – | 10 | |
| 20 – 250°C (68 – 480°F) | – | – | |
| 20 – 500°C (68 – 930°F) | 13 | – | |
| 20 – 750°C (68 – 1380°F) | – | – | |
| 20 – 1000°C (68 – 1840°F) | 15 | – | |
| Thermal conductivity λ at 50°C | W/m K | 17 | 17 |
| at 122°F | Btu in/ft2 h °F | 120 | 120 |
| Specific heat capacity at 20°C | kJ/kg K | 0.52 | 0.52 |
| at 68°F | Btu/lb °F | 0.120 | 0.120 |
| Melting point (approx.) | °C | 1430 | 1435 |
| °F | 2610 | 2620 | |
| Mechanical properties* (approx.) | |||
| Tensile strength | N/mm2 | 640 | 610 |
| psi | 92800 | 88500 | |
| Yield point | N/mm2 | 340 | 340 |
| psi | 49300 | 49300 | |
| Hardness | Hv | – | – |
| Elongation at rupture | % | – | 30 |
| Tensile strength at 900°C | N/mm2 | – | – |
| at 1650°F | psi | – | – |
| Creep strength*** | |||
| at 800°C | N/mm2 | – | – |
| at 1470°F | psi | – | – |
| at 1000°C | N/mm2 | – | – |
| at 1830°F | psi | – | – |
| at 1100°C | N/mm2 | – | – |
| at 2010°F | psi | – | – |
| at 1200°C | N/mm2 | – | – |
| at 2190°F | psi | – | – |
| Magnetic properties | 4) | 5) | |
| Emissivity, fully oxidized condition | 0.88 | 0.88 |
1) Magnetic (Curie point approx. 600°C (1100°F))
2) Non-magnetic
3) Slightly magnetic
4) Magnetic up to 610°C (1130°F) (Curie point)
5) Magnetic up to 530°C (990°F) (Curie point)
6) ± 10%