Austenitic stainless steels (e.g. grades 1.4301 and 1.4833) consist of chromium(16-26%), nickel (6-12%) and iron. Other alloying elements (e.g. molybdenum) may be added or modified according to the desired properties to produce derivative grades that are defined in the standards (e.g. 1.4404). The austenitic group contains more grades, that are used in greater quantities, than any other category of stainless steel.