... (high speed steel) Size: Round: Φ 3.2~200mm Flat: 10~90*205~305mm Hot rolled /forged,annealed,black surfac ... M2 Flat bar( high speed tool steel) Standard and Grade:AISI: M2 ... manufacture of forming tools, e. G. Cold extrusion head, extrusion die, punch dies of long service life, and plastic molds of ...