Carbon Steel Sheets are made from an alloy of iron and carbon. Carbon steel plate is one of the most commonly used steel grades in the world. Alloy steels may contain a variety of elements, including chromium, nickel and vanadium. Steel may be defined as carbon steel when no minimum content of chromium, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium, or any other element is specified or required. Used to achieve alloying effects.