THERMI®-SNT
THE STAINLESS STEEL PROCESSING SOLUTION
THERMI®-SNT is a high-temperature (>1000°C ) nitrogen diffusion thermochemical treatment that increases the surface hardness of stainless steels without compromising their corrosion resistance.
At high temperatures, the solubility range of nitrogen in austenite is more or less wide, favoring treatment depths of the order of 0.1 mm to 1 millimeter.
Treatment conditions are chosen to avoid nitride precipitation, in order to maintain corrosion resistance.
The quenching treatment that follows this diffusion stage preserves corrosion resistance and, in the case of martensitic steels, hardens the part's core (with a level of hardening that varies according to the steel grade).
Surface hardnesses range from 450 to 750HV , depending on the material.
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Information to be communicated :
Material designation (according to international standard) or chemical composition.
Drawings, diagrams or photos of rooms clearly showing :
- Part dimensions
- Functional zones
- Areas to be controlled
- Target hardness or diffusion layer depth
- Imperative temperature not to be exceeded or heat treatment carried out beforehand (in particular tempering temperature)
- Part shaping and surface finishing methods
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Our FAQs
Vacuum deposition is a surface treatment used to deposit a material or alloy on a mechanical part.
The use of vacuum technology ensures a perfectly clean, non-polluting process.
It is not subject to REACH legislation.
This process greatly increases resistance to wear, abrasion, friction and corrosion. As a result, component life is greatly extended.
Standard thicknesses are of the order of 3µm and deposition is carried out on finished parts.
PVD is physical vapor deposition. The element to be deposited is obtained by evaporation or sputtering via a physical process. PACVD is plasma-assisted chemical vapor deposition. The element to be deposited is obtained from chemical reactions. Plasma enables this chemical reaction to take place at lower temperatures.
Vacuum deposits are classified into several categories: anti-wear, friction, decorative and biocompatibility. The applications are therefore very varied: automotive components, aerospace, tooling, cutting tools, medical devices, decorative parts...
The deposition method depends above all on the nature of the coating to be deposited and the substrate.
If the substrate cannot be heated to high temperature, the deposition must be carried out using low-temperature technology.
If the coating to be deposited consists of a solid element (metal or graphite target), a physical process such as PVD is used. If the coating consists of a gas or liquid, a chemical process such as CVD or PACVD is used.
Incorporate carbon below the surface of the steel part to improve fatigue and wear resistance on the surface, while maintaining good core mechanical properties.
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