June 2014

Stainless Steel: Can even a superficial incision trigger corrosion?

The stainless steel used in Eurotubi Pressfitting pipes and fittings is synonymous with corrosion resistance. Nevertheless, an accidental superficial incision could trigger corrosion. What are the most serious cases and what can be done?
Besides being practical and quick to install, the Pressfitting system in AISI 316L stainless steel offers extraordinary sturdiness and corrosion resistance. In fact, it can even be used in environments with high salinity and in systems that must be regularly sanitised with chlorine-based solutions.

During stocking and installation of stainless steel pipes and pressfittings, maximum care must be taken to avoid scratches on the surface of the steel.

The extent of the damage depends on the depth and width of the incision and the type of material that caused it. The potentially worst case scenario is when the incision is deep enough to exceed the protective layer on the surface, also creating a minimum deposit of ferrous material.

Principle of corrosion on a stainless steel AISI 316L pip, triggered by an impact with a sharp ferrous tool

Contact with ferrous materials with a different composition will trigger corrosion, which can be of various types, that then spreads with a speed that varies on a case by case basis.

If you have a fitting or part of a pipe with incision damage that is rather deep and/or widespread, avoid using it. It is definitely best to use a new fitting or pipe part rather than risk a future leak in the system.
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2. Stainless Steel: Can even a superficial incision trigger corrosion?
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