alloy round bar standard:Chinese GB,ASTM, DIN Material:a42CrMo ... :12-400mm length:6m or morefor industry,etcapplication:gear,backshaft,drill pipe,mouldand etcchemical composition:C: 0 ... making important machinery parts, such as bearing, gear, connecting rod, transmission gear, supercharger gear, engine cylinder, spring, 1200mm~2000mm rotary shouldered ... size than 35CrMo. 42CrMo alloy steel round bar