Iron alloy containing a Chromium percentage exceeding 10.5%. Its extraordinary corrosion resistance is due to the spontaneous formation of an invisible, self-healing protective film.
The passive layer instantly reforms in the presence of oxygen if the surface is scratched or cut.
Stainless steel is not a single material but a vast family of alloys designed to withstand aggressive environments. In architecture, its history begins in the 1930s with the Chrysler Building in New York.
Unlike ordinary steels, which oxidise to form rust (porous and destructive), stainless steel contains chromium that reacts with oxygen to form a very thin layer of oxides and hydroxides. This passive film is impermeable and blocks the diffusion of oxygen towards the underlying metal. If scratched, the film regenerates instantly, provided the environment is not devoid of oxygen.
The grade AISI 304 (1.4301) is the standard for interiors and exteriors in rural or non-saturated urban atmospheres. However, in coastal areas or where de-icing salts are present, the use of AISI 316 (1.4401) becomes necessary; it contains molybdenum (2-3%), an element that dramatically increases resistance to pitting corrosion caused by chlorides.
European and international references applicable.
From 2B (cold-rolled) to BA (mirror-polished), through satin, brushed or mechanically decorated finishes. In coastal or saline areas AISI 316 is mandatory.
Rigid-decorated or satin stainless steel panels for high-tech envelopes.
PRC.21 · Open the processAISI 316 accessories and structures for environments exposed to salt spray.
Antibacterial surfaces for the food and medical sector.
Cables, terminals and anchoring systems with high mechanical strength.
PRC.25 · Open the processPREN (Pitting Resistance Equivalent Number) = Cr + 3.3Mo + 16N. The higher the value, the greater the resistance to chloride pitting. A PREN above 18 is considered acceptable for moderate saline environments; above 25 for marine conditions.
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