machinery: 1.hardness:58-62HRC 2.diameter:50-1,000mm 3.lifetime:3000HRS 4.forging iron drawing semi-finished goods grinding finished product drawing factroymachinery: Our machinety part are used in construction machinery and mining machinery , the outer diameter is from 50mm-1,000mm. The material is chrome molybdenom casting iron. The hardness is HRC58-62 , the working face precision within 0. ...