Stainless steel is an iron alloy. It should contain 10.5% Cr Cr and max 1.2% C element. Prevention of Cr element used in stainless steel; (Cr2O3) on the surface of the material so that the material can be protected from oxygen.

The Cr and the passivation ratio in stainless steel determine the stainless steel quality of the steel.

The oxide layer formed on the surface of the material is incalculable and watertight.