Stainless steel,  originally called rustless steel, is any one of a group of ferrous alloys that contain a minimum of approximately 11% chromium, a composition that prevents the iron from rusting and provides heat-resistant properties. Different types of stainless steel include the elements carbon, nitrogen, aluminium, silicon, sulfur, titanium, nickel, copper, selenium, niobium, and molybdenum. http://www.jstisco.com/stainless-steel-plate/