Common trade names: Resistohm 125, Aluchrom W.
FeCrAl 125 (Werkstoff Nr 1.4725) is a ferritic alloy of the FeCrAl family, which can be used as heating element of resistance up to 1150°C.This alloy has electrical resistance properties similar to those of the Nickel-Chromium alloys, making it suitable for electrical heating applications. Absence of nickel makes them cheaper than Nickel-Chromium alloys, but it also makes them more prone to corrosion. Care should be taken to operate these heating elements in dry conditions to minimize corrosion.
Chemical composition
| Iron Fe Bal. | Chromium Cr 14-16% | Aluminium Al 3.5-5.0% | Carbon C 0.1% |
Physical properties
| Density at Room°C |
Coeff of Linear Expansion b/w 20-1000°C 10-6/K |
Electrical Resistivity at 20°C |
Melting Point °C |
Max Continuous Operating Temperature in Air °C |
Magnetic Properties |
| 7.31 g/cm3 | 14 | 1.20 µΩ-cm | 1520 | 1150 | The material is Magnetic |
Mechanical properties
| Tensile Strength N/mm2 |
Yield Strength (daN/mm²) |
Hardness (HV) |
Elongation (A% on 100 mm) |
| 700-800 | 50 | 210 | 18-20 |
Product forms
| Product | Size (mm) | Condition of Supply |
| Wire | 0.2 – 12.0 | Bright Annealed Oxidized |
| Bar | 5.0 – 60.0 | Hot Finished Cold Finished Peeled Bright Turned Bright Annealed |
| Strip | Thickness 2.5 – 5.0 Width 20 – 100 |
Cold Finished Bright Annealed |
| Ribbon | Thickness 0.2 – 1.0 Width 2.0 – 4.5 |
Bright Annealed Flat Rolled |
| Stranded Wire | 2.5 – 3.0 | Hard Annealed |
Applications
FeCrAl 125 can be used at temperatures up to 1150°C. This alloy is particularly recommended for heating elements operating out in the open, in tubes quartz, in the emergent heaters, in the rheostats and in general where the temperature on the element is under 1180. Although it has a higher resistivity of 20 % than Nickel-Chromium alloys, FeCrAl 125 presents some inconveniences compared with Nickel-Chromium: Lower elongation at high temperature & More important fluctuation.
- Heating elements operating out in the open.
- Tube quartz.
- Emergent heaters.
- Rheostats.