BGH FecroTHERM are ferritic iron-chromium-aluminium heating resistance alloys containing up to 25% chromium and more than 5% aluminium, which, due to their high electrical resistivity and low density, require less material than BGH NicraTHERM for the same power output.
They are particularly suitable for use in oxidising, sulphurous and carburising atmospheres and remain magnetic up to the Curie temperature of 600 °C.
At temperatures above 1000 °C (538 °F), a high-temperature-stable, well-adhering and electrically insulating aluminium oxide layer forms on the surface of FecroTHERM alloys, making them suitable for operating temperatures up to 1400 °C (2550 °F). This allows for higher surface loads compared to NicraTHERM alloys. The oxide layer also acts as a barrier to prevent the progressive diffusion of oxygen inwards and aluminium outwards, thereby positively influencing service life.
FecroTHERM alloys are magnetic up to a Curie temperature of 600 °C and are particularly suitable for use in oxidising, sulphurous or carburising atmospheres. In particular, when in direct contact with reducing atmospheres, the heating elements must be properly pre-oxidised or regularly re-oxidised.
Following use at temperatures above 1000 °C (538 °F), the alloys may develop cold brittleness due to significant grain growth, which subsequently makes them susceptible to impact and shock loads when cold. This behaviour is characteristic of ferritic heating resistance alloys.
So-called reactive elements such as zirconium (Zr), yttrium (Y), cerium (Ce), hafnium (Hf) or lanthanum (La) can be added to the alloys in small quantities to improve the stability and adhesion of the oxide layer.
| Eigenschaft | Wert |
|---|---|
| Grade name | |
| Heat treatment | annealed (+A) |
BGH FecroTHERM 20-5 ist eine ferritische Edelstahllegierung aus Eisen, Chrom und Aluminium mit hohem spezifischem Widerstand und guter Oxidationsbeständigkeit. Sie ist bis ca. 600 °C magnetisch.
Lieferformen- Draht (auf Spulen bis 3 mm, Ringe, Fässer)
- Blanke Stäbe, Stranggussknüppel
Heizelemente in Hochtemperaturöfen und Strahlungsheizern mit Betriebstemperaturen bis zu 1300 °C. Geeignet für die Abgasbehandlung.
Anwendungsbeispiele- Heizelemente für Hochtemperaturöfen
- Brennerköpfe und -abdeckungen
- Heizrohrelemente
- Strahlungsheizungen
- Ceran-Kochfelder
| Eigenschaft | Wert |
|---|---|
| Grade name | |
| Heat treatment | annealed (+A) |
Properties
BGH FecroTHERM 25‑5 is a ferritic iron‑chromium‑aluminum alloy (FeCrAl) that is particularly suitable
for use in high‑temperature applications above 1000 °C due to the formation of a stable Al₂O₃ layer.
The material is characterized by high scale resistance, high electrical resistivity, and excellent corrosion
resistance in chemically demanding environments with oxidizing, sulfur‑containing, or carburizing
atmospheres. BGH FecroTHERM 25‑5 is magnetic up to approx. 600 °C and is suitable for applications
with operating temperatures up to 1400 °C.
Area of Application and Typical Applications Examples
BGH FecroTHERM 25‑5 is used as a heating element in high‑temperature or sintering furnaces,
particularly at high operating temperatures. Typical areas of application are electric furnces for
industrial heat treatment, the glass and ceramics industry, and the chemical industry.
Delivery Conditions
- Wire annealed or annealed, pre‑oxidized (coils, barrels, on spools up to 3.0 mm possible)
- Straightened bars
- Alternative delivery conditions
| Eigenschaft | Wert |
|---|---|
| Grade name | |
| Heat treatment | annealed (+A) |
Properties
BGH FecroTHERM 14‑4 is a ferritic iron-chromium-aluminum alloy (FeCrAl) with high electrical resistance and good corrosion resistance in chemically demanding environments with oxidizing, sulfur-containing, or carburizing atmospheres.
FecroTHERM 14‑4 is magnetic up to approximately 600 °C and is suitable for applications with operating temperatures up to 1000 °C.
Area of Application and Typical Applications Examples
BGH FecroTHERM 14-4 is used in high-temperature load resistors and braking resistors. Other applications include rheostats, heating cables, and heating coils in household appliances.
Delivery Conditions
- Wire annealed or annealed, pre‑oxidized (coils, barrels, on spools up to 3.0 mm possible)
- Straightened bars
- Alternative delivery conditions