... A3, 40Cr, 20CrMnTi, 42CrMo, copper, stainless steel and so on as per your requestprocessForgedHeat treatmentHigh frequency quenching, heat treatment, hardened ... ,triplex quadruplex,quintuples,o on.Hub style : Type A (Hubless) or Type B (Hub) or Typle C (Hub on both size) or Type ... D(detacheable bolt on hub)International Standard : ANSI B29. ...