... grey iron GG25 3process:investment casting,OEM service 4condition: cnc fully machined machinery parts1) materials: grey iron, ductile ... (foundry shop used): numerical control lathe,vertical type CNC machining center, boring machine, universal miller,vertical drill ... tester,hardness tester,metallographic microscope,spectrometer,PC thermometer,CE NSP-550CS heat analysis instrument,molding sand testing ...