Those are alloys of chemical composition Fe + Cr + Fe with some additional elements and rare earth so as Yttrium, zirconium, Titan, Cerium, and Lanthanum which confer them: An excellent resistance to oxidation under heat A limitation of intergranular oxidation A good life time Alloys in question are: Resistohm 125 – 135 – 140 – 145 – Y Their metallurgical structure confers them nevertheless a cold plasticity lower than austenitic alloys (NiCr).

Advantages of FeCrAl compared with NiCr:

• A higher resistivity (until 1.44 ohm mm²/m)
• A temperature of use higher in the air (1300°C against 1200 °C for Resistohm 80)
• A higher charge rate
• A good resistance to sulphurous and carbonaceous atmospheres
• A lower density which means: with an equal weight of material a more important number of elements (a cheaper unit price)