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Situated at the heart of Belgium NTTB - Nemotherm Traitement Thermique Belge is the specialist in heat treatments of steel and non-ferro products. Our company was founded in 1976 and is one of the leading service heat treaters. 

Our competency has led to customers from a wider area knowing us, always entrusting their products and being advised by us in the choice of material and the associated heat treatment. The right choice of material in combination with the correct heat treatment makes an essential contribution to the strength, wear resistance and / or lifetime of the product. Our goal is to build up a long time relationship with our customers, and to meet the ever changing higher demands to your products we are certified to the following quality standards.

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What we do

From high to low alloys, from large to small parts,


With a great diversity of heat treatment technologies and services like blasting, cleaning, cryogenic, and shrinking we service customers from all over the Industry like Aerospace, Defense, Nuclear, Agriculture, Machine building, Railway, Automotive and other Industries in a most wide area. We believe that in an ever changing market it is important to deliver best technical support, highest quality and proactive communication to our customers. To be and stay the best we are continuously working on improvements with strong focus on new investments.

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Our Processes

Flame Hardening

Flame Hardening

Flame hardening is a technique used to harden (or soften) certain areas of a steel part, creating a difference in hardness between these areas. The advantage of local heating of parts is less distortion and for some steel types a higher hardness.

Flame hardening is closely related to Induction hardening but differs in some aspects, Flame hardening is almost unlimited in size or shape of the part so no need to build a special inductor for complex geometries. In general you can say that Flame hardening starts there where Induction hardening stops. However, there is one significant difference between these technologies; the heating time. Whereas Induction heating time is normally very short, the Flame hardening takes a longer heating time. This has its influence on the hardening profile. The Induction hardened profile shows a very abrupt hardness decrease whereas the Flame hardened profile shows a smoother decrease of hardness. A smoother decrease of hardness can be very helpful for heavy loaded applications to prevent the skin from popping off.

Size: up to 7meters length and 20 Tons


Atmospheric Heat Treatment

High temperature process under a protective gaseous atmosphere.

Atmospheric high and low temperature heat treatments, usually followed by rapid cooling (quench) in polymer or water. To avoid decarburization and oxidation parts are treated under nitrogen.


Size: up to 2meters length and 1,5 tons

Although we are temporary not able to do carburizing with sequent oil quench ourselves, we will help you finding the right partner.

Non Atmospheric

Non-Atmospheric Heat Treatment