... Green sand & resin sand technology. Features to grey iron casting (pump body): 1.Material :GG20,GG25 or GG30.2.Moulding processing ... cupola furnace or medium frequency induction electric furnace.4.Casting Inspection:direct-reading spectrum instrument,metallographic analysis,ultrasonic ... up to 800kgs.10.Representative product:housing,casing,pump body,valve body,cover,bearing stand,bolster,frame.