... sand casting process condition - raw casting OEM service boiler parts1) Materials: grey iron, ductile iron, malleable iron ... lathe, line cutter etc.6) Testing equipment (foundry used): elongation tester, hardness tester, metallographic microscope, spectrometer, ... , chemistry composition analysis room. Testing equipment (machine shop used): vernier caliper, depth caliper, micrometer, depth micrometer, ...