Stainihard® NC is a process for surface harding of (austenitic and duplex) stainless steel, without having a negative effect on its corrosion resistance. In some cases, this is even improved.
The treatment is based on the classic nitro-carburization in gas. Stainihard® NC is a variation, which makes it possible to apply this process to stainless steel. As with other diffusion processes, products can be treated as single work pieces as well as in bulk.
With Stainihard® NC the surface is enriched with nitrogen and carbon to improve the mechanical properties of the product.
Stainihard® NC is a registered trade mark of Aalberts surface technologies Eindhoven B.V.
the process of surface hardening with Stainihard®
Depending on the application, there are various process options, with the aim of achieving the desired properties.
During the Stainihard® process the surface will be enriched with nitrogen and carbon in a special way. With austenitic stainless steel this is not easily possible. Nitrogen and carbon diffuse at a low temperature (<450°C) in the product surface. The result is a very high surface hardness (1200-1400HV0.05) without negatively affecting the corrosion resistance!
The Stainihard® layer is an expanded austenite zone (also called S-phase). This zone consists of the relevant stainless-steel material with a supersaturation of nitrogen and carbon. Because of this supersaturation, compressive stresses arise. This increases the hardness considerably, without negatively affecting the corrosion resistance. The reason is, with Stainihard® NC the formation of chromium nitride (CrN) and / or chromium carbide (CrC) is suppressed (expanded austenite). This in contrast to the classical nitriding processes such as salt bath and plasma nitriding, where the corrosion resistance will decrease considerably as a result of the formation of this chromium nitride and carbides!
The depth of this expanded austenite layer formed by Stainhard is partly dependent on the chosen stainless-steel material, the deformation degree and the surface condition.
benefits & distinctive properties
Stainihard® significantly improves the hardness of steel surfaces (austenitic and duplex), thereby increasing their resistance to wear and tear.
The properties surface hardening with Stainihard® are:
High surface hardness
High abrasion resistance against abrasive wear
High resistance against cold welding, seizing or contact corrosion
Corrosion resistance is not affected, in some cases even improved
High resistance to shear
No change in appearance
Lower friction coefficient
Higher fatigue strength
Good dimensional and shape stability
The Hardness of Stainihard® is 1200-1500HV0,01.
The above hardness refers to the hardness on the surface if it is measured in a cross-section of the layer. Regular hardness measured on the surface is: 1000-1400HV0.05 at a depth of 10 to 30 µm.
The hardening depth of Stainihard® NC depends on the type of stainless steel, the surface condition and the degree of deformation. With increasing surface deformation, the layer depth decreases.
All values/properties mentioned in the brochure/website are dependent on the type of stainless steel and its condition. The treatment and specification of end products must be determined in advance in agreement with Aalberts Surface Technologies Eindhoven B.V.
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Heiß-Isostatisches Pressen (HIP) dient der Beseitigung von Porosität. Sie benötigen bei Lötverbindungen eine hohe mechanische Haltbarkeit und Unempfindlichkeit bei hohen Temperaturen? Wir bei Aalberts surface technologies bieten die Lösung durch Hartlöten (brazing).
Polymerbeschichtungen können auf viele Grundmaterialien aufgebracht werden und bieten lang anhaltenden Schutz. Sie sind mechanisch besonders gut mit dem Untergrund verankert und bieten verbesserte Gleiteigenschaften und/oder hohe Verschleißfestigkeit.
Mit 40 Jahren Erfahrung in der kontinuierlichen Veredelung von reel to reel können Sie sich auf Aalberts surface technologies verlassen, um innovative Lösungen zu finden. Unser Service umfasst Trommelgalvanik, kontinuierliche selektive Galvanik und Gestellgalvanik.
Fast alle metallischen Grundwerkstoffe können mit unseren selbstentwickelten und patentierten Verfahren durch Oberflächenbeschichtungen in ihren Eigenschaften optimiert werden, egal ob sie besonders hart, glatt, verschleißfest oder korrosionsbeständig sein sollen.
We offer all types of heat treatment processes. Our facilities are closely interlinked in terms of logistics, which means that all processes are available to you. For a complete list and description of heat treatment technologies please select the button.
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Almost all metallic base materials can have their properties optimised by surface coatings using our proprietary and patented processes, regardless of whether they should be particularly hard, smooth, wear-resistant or corrosion-resistant.
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