... Work, Hot-rolled, Hot-forged 3.Certification: ISO 1999-2008High-speed Tool Steel M2, SKH521.Diameter: 20-200 mm, ≥200 mm2 ... tools that rotate quickly when in use,Components canbe brought to shape by milling,tuming and sawing.chemical composition C 0 ... .75 Mo 4.50-5.50 Christmas Special Steel Price High-speed Tool Steel ASTM M2 / SKH52