harden the surface of stainless steel
Stainihard®
what is Stainihard®?
Stainihard® NC is a process for surface hardening 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 trademark 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 of 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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frequently asked questions - Stainihard®
The hardening depth of Stainihard® NC depends on the type of stainless steel, the surface condition and the degree of deformation.
The use of Stainihard®, a surface hardening method, can be useful in various industries. For example, in the automotive and aerospace industries, but also in the tool and machine building industry.
Stainihard® NC is a process used to harden the surface of (austenitic and duplex) Stainless Steels without reducing the corrosion resistance – in some cases the corrosion resistance is even improved.
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process locations
Any questions? Contact us directly or select a process location near you.
Eindhoven
the Netherlands 51.47035245.419001 info.eindhoven-heat@aalberts-st.com +31 40 266 3000 show locationUnsere Verfahren
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