size:DIA 20-150mm(different DIA you can choose )

hardness:HRC 58-65( different HRC you can choose)

chemical elements: C:0.61-0.68  Si:0.2-0.4  Mn:0.8-1.2   S:<=0.030   P:<=0.030  Cr:0.9-1.2 
products' speciality:Hing hardness  no breakage  good wear resiscance  even wearing