Factory price, ISO quality, MOQ 10MT, EAF+LF+VD ASTM JIS DIN GB UT+ ... , Hot-rolled, Hot-forged 3.Certification: ISO 1999-2008High-speed Tool Steel M2, SKH521.Diameter: 20-200 mm, ≥200 mm2.Classification ... .75 Mo 4.50-5.50 Christmas Special Steel Price High-speed Tool Steel ASTM M2 / SKH52