1. Air hardening , high carbon, high chromium tool steel possessing extremely high wear resisting proprerties , it is very deep hardening and is practically free from size change after proper treatment. This tool steel's high chromum content gives it mild corrosion resisting properties in the hardened condition 2.Tool steel grade:cold work tool steel plate/round bar/flat bar (cr12 /d3/din 1.2080)3..Tool steel 3. Specification(or as customer's request): Flat bar:thickness:8-300mm, width:200-800mm, length:2000~5000mm Round bar:thickness:12~500mm, length: length:2000~5000mm.