Stainitec , Stainihard

Surface Hardening Stainless Steels - Stainitec

One of the main reasons Stainless Steels are chosen for applications is because they are highly resistant to rusting. However many, such as austenitic stainless steels, are relatively soft, cannot be hardened, are prone to galling and have poor wear resistance.
Both Stainitec and Stainihard deliver hardening onto 316 Stainless Steel.

traditional Nitriding of stainless steel 

When Stainless Steel is treated by traditional nitriding, for example using salt bath or plasma nitriding, a diffusion layer is created within the steel surface, increasing the steel hardness. Characteristic to these traditional methods of treatment is the formation of Chromium Nitride (CrN) in this surface diffusion layer, which improves the surface hardness and wear resistance, but it is important to note the corrosion resistance is dramatically reduced.

Both Stainitec and Stainihard® processes deliver surface hardening to 316 Stainless Steel. 304 stainless steel is also a common steel that we treat to achieve high surface hardness. These processes will surface harden stainless steels by Nitriding or Carburising to create a very hard layer without reducing the corrosion resistance – in fact, in some cases the corrosion resistance is even improved. This provides anti galling, scratch resistance and high surface hardness

These treatments are available from Aalberts Surface Technologies, Birmingham and our sister company Aalberts Surface Technologies, Eindhoven, Holland. We specialise in hardening 316Stainless Steel.

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In both the Stainihard and Stainitec treatments the formation of Chromium Nitride (CrN) or Chromium Carbide (CrC) is suppressed and a so called ‘S-phase’ or ‘Supersaturation phase’ is created. This layer consists of Stainless Steel which is supersaturated with Nitrogen and / or Carbon at the surface. The saturation creates high internal stresses in the layer and the hardness is increased significantly, without reducing the corrosion resistance. The 'S' phase layer formed ranges typically from 10-30 microns.

The Stainihard NC process enriches the steel surface with Nitrogen and Carbon to provide a hard, wear resistant ‘S-phase’ layer at the surface. Stainihard NC is a gaseous thermo-chemical process suitable for processing individual components or large batch volumes.

It is also possible to apply a PVD hard coating such as TiN on top of these layers to further enhance wear resistance and friction characteristics. Overall performance is always improved by these Duplex treatments

Commonly Treated Materials:
Stainihard® is developed to be applied to austenitic stainless steels. In certain circumstances it also is possible to treat other stainless steels (e.g. Duplex or PH stainless steels). 

Examples of suited austenitic Stainless Steels :

AISI: 301, 303, 304, 304L, 304Ti, 310, 316, 316L, 316Ti, 321, 347, 904L 

DIN-Number: 1.4301, 1.4305, 1.4307, 1.4310, 1.4401, 1.4435, 1.4539, 1.4541, 1.4550

Stainitec - Data Sheet

 Stainitec Data

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Aalberts Surface Technologies Heat Ltd | Disclaimer

Registered Address.: Aalberts Surface Technologies Heat Ltd, Blackhorse Road, Letchworth. SG6 1HD 

Tel: 01462 472147