... 9001:2008 Material:casting ductile iron 450-10 sand casting drawings are welcome sand casting ductile iron 450-101.Material:grey ironGG15 ... ,GG20,GG25,GG30,ductile iron 400-18,450-10,500-7 by vacuum casting,sand ... (2)Hardness checking(3)Dimensions testing(4)Prevailing microstructure testing cast iron tractor parts