What is Stainless Steel?
The chromium oxide "CrO" creates an invisible barrier ("passive film") to oxygen and moisture. Therefore the Chromium protects the iron against most corrosion or red-colored rust; thus the term “stainless” steel.
The layer is too thin to be visible, meaning the metal stays shiny. It is, however, impervious to water and air, protecting the metal beneath. Also, when the surface is scratched this layer quickly reforms.
The purpose of stainless steel is to provide hard steel material highly resistant to stain, rust and corrosion and resistance against:
- Adverse atmospheric conditions such as carbon dioxide, moisture, electrical fields, sulfur, salt, and chloride compounds
In 1821 the Frenchman named Berthier found that iron when alloyed with chromium was resistant to some acids. It is worth stating that all steel types exposed to water and oxygen will corrode. However it is accepted as an international standard, that if less than 0,1 mm of the surface of a stainless steel plate is corroded in a year, then it is durable and can be accepted as chosen quality for the application.
|Salinity/ temperature||max 15 degrees||max 20 degrees||max 30 degrees|
|max 0.5% salinity||AISI304||AISI304||AISI304|