Alkrothal® 14 is a ferritic iron-chromium-aluminium 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 | 435 | 580 | 23 | 220 |
| 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 10-2/min
| Temperature °C | 800 | 1000 |
|---|---|---|
| MPa | 1.2 | 0.5 |
Physical properties
| Density g/cm3 | 7.28 |
|---|---|
| Electrical resistivity at 20°C Ω mm2/m | 1.25 |
| Poisson's ratio | 0.30 |
| 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 |
| Temperature °C | Thermal Expansion x 10-6/ K |
|---|---|
| 20 - 250 | 11 |
| 20 - 500 | 12 |
| 20 - 750 | 14 |
| 20 - 1000 | 15 |
| Temperature °C | 20 |
|---|---|
| W/m K | 16 |
| 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 |
| Melting point °C | 1500 |
|---|---|
| Max continuous operating temperature in air °C | 1100 |
| Magnetic properties | The material is magnetic up to approximately 600°C (Curie point). |
| Emissivity - fully oxidized material | 0.70 |
