specialist of high chrome gravel pump impeller 10 years experience ISO,CE passed vaious size and ... materails quick delivery sand gravel pump impeller main features:1.high chrome alloy materials2.anti-abrasive, corrosion ... (Resin Sand Casting, Green Sand Casting), Permanent Casting, Die Casting, Centrifugal Casting, Forging and Stamping etc. Machining Types: Machined by Round ...