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Muffles and retorts

Muffles For Furnaces Nicro 1

The muffle is an essential part of heat treatment furnaces used for case-hardening, tempering, brazing and annealing treatments. During these treatments, the muffle may be subject to intense thermal, mechanical or chemical stress due to the active atmosphere inside the furnace.

Muffle furnaces can be box-shaped or cylindrical. The most common furnaces have a parallelepiped chamber, although furnaces with arched or vaulted roof are also common. Moreover, we can also find tilting tube, openable and rotary furnaces.

The interior of rotary furnaces is fitted with the retort, the most important element of the furnace, which isolates the atmosphere and creates the part transit movement, usually towards tempering.

Similarly to muffles in conveyor furnaces, the active atmosphere in some chamber furnaces must be contained in a metal muffle. The thermal stress generated in the heating and rapid cooling zones requires special adaptations, as well as combinations of alloys suited to this difficult environment.

Nicro is a premium partner thanks to decades of experience in constructing these products and the acquired knowledge.

In the absence of a construction drawing, we can use reverse engineering to measure the dimensions and collect all the necessary data to construct a new muffle.


Aisi 321 (Werkstoff 1.4541)
Aisi 309 (Werkstoff 1.4828)
Aisi 310 (Werkstoff 1.4845)
Avesta 253MA (Werkstoff 1.4835)
Nicrofer 6025HT (Werkstoff 2.4633)
Inconel 600 (Werkstoff 2.4816)
Inconel 601 (Werkstoff 2.4851)
Incoloy 800H

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