Adding chromium to low carbon steel gives it stain resistance. In addition to chromium, nickel, molybdenum and niobium enhance the corrosion resistance of Stainless Steel. It is the addition of a minimum of 12% chromium to the steel that makes resist rust or stain ‘less’ than other types of steel. The chromium in the steel combines with oxygen in the atmosphere to form a thin, invisible layer of chrome-containing oxide, called Passive film. If the metal is cut or scratched and the film is disrupted, more oxide will quickly form and recover the exposed surface and protect it from corrosion. In sweater, chlorides rom the salt will attack and destroy the passive film but it can be repaired itself even in a low oxygen environment.
There are several types of stainless steel such as Austenitic, Ferritic, Martensitic, etc. The most common and important type is known as austenitic which contains iron, 18-20% of chromium and 8-10% nickel. Within the austenitic group two particular grades are most familiar known as AISI:304 & 316. AISI 304, possesses the property of corrosion resistance in natural atmospheric environments, however, only non-acid based cleaning solutions can be used. AISI 316 (adding extra 2-3% of molybdenum and nickel), has enhanced corrosion resistance suitable for more aggressive atmospheric environments, of low maintenance.
Stainless steel can be produced in a variety of finishes and textures and can be tinted over a broad spectrum of colours.
Kompanie’s Zecura range is usually available in AISI 304 grade, however products manufactured in AISI 316 are available to special order.
