The answer depends on three things, and higher temperature is not automatically the deciding one.
Both families are used for the same job, and both work well. The choice comes down to service temperature, atmosphere and how often the furnace cycles.
| FeCrAl | Ni-Cr | |
|---|---|---|
| Max service temperature | up to 1,400 °C | up to 1,200 °C |
| Toughness at room temperature | low — brittle when cold | high — can be bent and welded |
| Resistivity | higher (1.2–1.5 μΩ·m) | lower (1.0–1.2 μΩ·m) |
| Oxidation resistance in air | excellent | good |
| Resistance to reducing atmospheres | poor | better |
| Cost | lower | higher, because of nickel |
"Hotter is better" is the wrong instinct. If the furnace runs at 950 °C, a 1,400 °C grade is not an upgrade — it is a more brittle, harder-to-form material being asked to do the same job at higher cost.
The right question is: what is the element temperature, not the furnace temperature? Elements run 50–150 °C hotter than the furnace, and that figure is what the grade must survive.
A 1,000 °C batch furnace, air atmosphere, one shift per day, 300 days a year.
Over three years, the FeCrAl option usually wins on total cost, unless the daily cycling is severe enough to make the brittleness the limiting factor.
Furnace type, service temperature, atmosphere, element span, and cycling pattern. With those five answers we can recommend a grade rather than a range.
