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Alkrothal 14 ferritic ironchromiumaluminium alloy (FeCrAl alloy)
Alkrothal 14 (Resistance heating wire and resistance wire) Alkrothal 14 is a ferritic ironchromiumaluminium alloy (FeCrAl alloy) with high resistivity suitable for use at temperatures up to 1100°C (2010°F). Alkrothal 14 is typically used for electrical resistance wire for applications such as heating cables.
CHEMICAL COMPOSITION
| C % | Si % | Mn % | Cr % | Al % | Fe % | |||||||
| nominal composition | 4.3 | Bal | ||||||||||
| Min | -
|
14.0 | ||||||||||
| Max | 0.08 | 0.7 | 0.5 | 16.0 |
MECHANICAL PROPERTIES
| wire size | Yield strength | Tensile strength | Elongation | Hardness |
| Ø | Rp0.2 | Rm | A | |
| mm | MPa | MPa | % | Hv |
| 1.0 | 455 | 630 | 22 | 220 |
| 4.0 | 445 | 600 | 22 | 220 |
| 6.0 | 425 | 580 | 23 | 220 |
YOUNG’S MODULUS
| temperature °C | 20 | 100 | 200 | 400 | 600 | 800 | 1000 |
| GPa | 220 | 210 | 205 | 190 | 170 | 150 | 130 |
Mechanical properties at elevated temperature
| Temperature °C | 900 |
| MPa | 30 |
Ultimate tensile strength deformation rate 6.2 x 10 /min
CREEP STRENGTH – 1% ELONGATION IN 1000 H
| Temperature °C | 800 | 1000 |
| MPa | 1.2 | 0.5 |
PHYSICAL PROPERTIES
| Density g/cm3 | 7.28 |
| Electrical resistivity at 20°C Ω mm/ m | 1.25 |
| Poisson’s ratio | 0.30 |
TEMPERATURE FACTOR OF RESISTIVITY
| Temperature°C | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | 1100 |
| Ct | 1.00 | 1.02 | 1.03 | 1.04 | 1.05 | 1.08 | 1.09 | 1.10 | 1.11 | 1.11 | 1.12 |
COEFFICIENT OF THERMAL EXPANSION
| Temperature °C | Thermal Expansion x 106/ K |
| 20 - 250 | 11 |
| 20 - 500 | 12 |
| 20 - 750 | 14 |
| 20 - 1000 | 15 |
THERMAL CONDUCTIVITY
| Temperature °C | 20 |
| W/m K | 16 |
SPECIFIC HEAT CAPACITY
| Temperature°C | 20 | 200 | 400 | 600 | 800 | 1000 |
| kJ kg-1 K-1 | 0.46 | 0.63 | 0.72 | 1.00 | 0.80 | 0.73 |
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