... for auto manufacturing, vessel industry,aerospace ,petrochemical plant, metallurgical machine Forging hollow Grade:CK45N, CK60, S355J2G3, ST52-3, 42CRMO4V,41ALCRMO7,21CRMOV5 ... engine, pecision tools, etc Delivery condition: forged, forged+rough machined, forged+finish machined, annealled, normalized, quenched+tempered, solution treat, etc Products: forged ...