... ductile iron, grey iron 3. Weight: 0.1-150KGS castings industrial parts 1.Material: ductile iron, grey iron, steel, under ... coated sand casting5.Surface treatment: ballblast, sand blasting, polishing7.Machining service: CNC, lathe, boring mill, milling machine, drilling ... ISO 9001-2000 certification. Compared with other companies, our castings are almost no casting defects, no shrinkage, no porosity ...