water pump impeller 1.Certificate:ISO/TS16949 2.Thickness:1.5-0.04mm 3.Material requirement:GB699-1999 water pump impellerThe the production processes of water pump impeller1.IQC:check the DOB,the component should accord with "GB699-1999".The surface is without bubble,flaw,scab,crack,impurity and obvious scarification,it can't be have layer.The sickness of steel plate is 1.5-0.04mm.2.Store:put-in ...