Ferritic stainless steel (400) of chromium content in 15% ~ 30%, with a body centered cubic crystal structure. It is generally do not contain nickel, sometimes also contains a small amount of Mo,Ti ,Nb, such as this kind of steel has a large thermal conductivity, small expansion coefficient, excellent oxidation resistance, good resistance to stress corrosion, etc. It is mainly used in the manufacture of atmospheric water, vapor water, resistant and oxidizing acid corrosion parts. Ferritic stainless steel has wide range application, excellent comprehensive performance, is the most important section of the nickel stainless.

Ferritic stainless steel is a type of chromium alloy that has ferritic structure at elevated and room temperature with body-centered cubic crystal structures. It has a chemical composition consisting of C≤0.02% and Cr 10.5%~32% and cannot be hardened by heat treatment. Ferritic stainless steel is used in comprehensive applications with excellent general properties, and is taken as a kind of primary nickel-saving stainless steels.