WHAT IS STAINLESS STEEL

In metallurgy, stainless steel is defined as a ferrous alloy with a minimum of 10.5% chromium content.

[1] The name originates from the fact that stainless steel does not stain, corrode or rust as easily as ordinary steel. This material is also called corrosion resistant steel High oxidation resistance in air at ambient temperature is normally achieved with additions of a minimum of 13% (by weight) chromium, and up to 26% is used for harsh environments.

[2] The chromium forms a passivation layer of chromium(III) oxide (Cr2O3) when exposed to oxygen. The layer is too thin to be visible, meaning the metal remains lustrous. It is, however, impervious to water and air, protecting the metal beneath.

Also, this layer quickly reforms when the surface is scratched. This phenomenon is called passivation. Nickel also contributes to passivation, as do other less commonly used ingredients such as molybdenum and vanadium.