Casting,Pipe Fitting,Cast Pipe.GG20 or GG25,Green sand or Resin sand ... or machined parts.Shot blast surface. Features to Casting,Pipe Fitting,Cast Pipe. 1.Material :GG20 or GG25.2.Unit weight ... -reading spectrum instrument,metallographic analysis,ultrasonic inspection,magnetic particle detector,mechanical properties inspection.6.Surface treatment:shot blast cleaning or powder ...