impeller OEM service supplier The product is the precision casting ,the specification is the 35#steel.the 45#steel,etc. impeller1MaterialDuctile cast iron,Grey cast iron2SandGreen sand,sodium silicate sand3MachineLathe,CNC,Drilling machine,Milling machine,Boring machine,Planing machine4ProcessSand Casting5Min Tolerance0.05mm6Productioncapacity0.5-5000kg7surface treatmentPowder coating,Painting, ...