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Binary nickel-iron alloy containing 36% nickel. It’s very low room-temperature thermal expansion coefficient makes it useful for tooling for aerospace composites, standards of length, measuring tapes and gauges, precision components and pendulum and thermostat rods. It is also used as the low expansion component in bi-metal strip, in cryogenic engineering and for laser components.
| Weight % | Ni | Fe |
|---|---|---|
| Typical Composition | 36.00 | 54.00 |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density | 25°C / 78°F | 0.293 lbs/in3 | 8.11 g/cm3 |
| Melting point | 2610 °F | 1430 °C | |
| Coefficient of thermal
expansion From 20°C to temperature |
100°C / 212°F | 1.1 µin/in- °F | 2.0 µm/m- °K |
| 200°C / 392°F | 1.4 µin/in- °F | 2.6 µm/m- °K | |
| 300°C / 572°F | 3.1 µin/in- °F | 5.5 µm/m- °K | |
| 400°C / 752°F | 4.7 µin/in- °F | 8.4 µm/m- °K | |
| 500°C / 932°F | 5.6 µin/in- °F | 10.1 µm/m- °K | |
| Thermal conductivity | 100-300°C
(212-572°F) |
5.78 BTU/ft- hr – °F | 10.0 W/m – °K |
| Electrical resistivity | 25°C / 78°F | 800 nΩ · m | |
| Temperature | Tensile | ||||||
|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation on
50 mm (2”) |
Reduction
of area |
||||
| °C | °F | KSI | MPa | KSI | MPa | % | % |
| 20 | 68 | 71 | 490 | 35 | 240 | 42 | 70 |
| 100 | 212 | 62 | 430 | 26 | 180 | 43 | 70 |
| 200 | 392 | 62 | 430 | 16 | 110 | 45 | 70 |
| 300 | 572 | 59 | 410 | 13 | 93 | 48 | 70 |
| 400 | 752 | 51 | 350 | 13 | 93 | 53 | 70 |
| 500 | 932 | 42 | 290 | 13 | 93 | 59 | 69 |
| 600 | 1112 | 30 | 210 | 11 | 77 | 68 | 67 |
(*) Hot-rolled, annealed
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