Study on the Series and Applications of Low Carbon Ductile Iron

Both the process of production and the composition of Sx have been studied and the series of low carbon ductile iron are also discussed. Results indicate that Sx modifier is sensitive to the CE of molten iron and some alloys. When the CE of molten iron and the contents of alloys are changed, the content of Sx must be adjusted too, Low carbon ductile iron can be stably changed into the one that non-carbon acicular bainite and retained austenite (about 25-28 percent) by quasi-casting bainite process and using Sx-2 modifier to treate Si-Mn-Cr-Cu-alloyed low carbon molten iron. The heat-resistant and corrosion-resistant low carbon containing ductile iron with good sphere shape and austenite microstructure can be obtained after modifying treatment by using Sx-3 for the 2% carbon containing Ni-Si-Cr 35 5 2 molten cast iron. And low carbon containing ferrite ductile iron with round sphere, more than 85% ferrite containing in the metal matrix and δ≥10% can be made after modifying treatment by using Sx-4 modifier for the 2.0%C and 2.8%Si low carbon containing molten cast iron.