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Bells, bases and diffusers for furnaces

Covers For Bell Furnaces Nicro 1

Bell furnaces have an extensive application field, including solubilisation of coils, wires, stainless steel or steel rods and annealing of sheet metal or wire rolls.

Nicro is able to provide the complete unit, consisting of the base, plenum, bell, diffusers and fans.

The most common heat treatments include case-hardening, carbonitriding, tempering, annealing and normalising. Each has different requirements – thermal in the heating zone and mechanical in the zone where the charge is placed. In bell furnaces, the material to be treated can be loaded on easily accessible isolated bases, in a straightforward and rapid manner.

The two protective covers, used to seal the space with the charge and the protective gas, separating it from the heated space, can be shifted to the base involved in the heating process using a bridge crane, moving gantry crane or other solutions.

The fixed bases, closing casings and heating and cooling bells ensure shorter treatment times through their successive use on the same charge. Furthermore, bell ovens offer an inexpensive thermal treatment method if used with multiple bases.

A bell furnace is therefore made up of:

- two casings, which are fitted with the fan, also made by Nicro;

- two protective covers that separate the charge from the heated space;

- a cooling cover, which ensures rapid cooling of the charge after annealing.

With these furnaces, the treatments can be carried out on a wide range of materials thanks to the protective atmospheres used.


Up to 12 m (height)
Up to 8 m

Up to 1580 mm

Aisi 304 (Werkstoff 1.4301)
Aisi 309 (Werkstoff 1.4828)
Aisi 309S (Werkstoff 1.4833)
Aisi 310 (Werkstoff 1.4845)
Avesta 253MA (Werkstoff 1.4835)
Nicrofer 6025HT (Werkstoff 2.4633)

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