What is the difference between pig iron and cast iron?
Cast iron: the need to control the composition of alloy elements, adding a certain amount of. At the same time the need to control the solidification process and heat treatment, control of graphitization process, meet the certain organization, to achieve a certain mechanical properties of nodular cast iron. We often hear is the addition of a rare earth magnesium ball nodulizer, and malleable cast iron by white cast iron by annealing.
Steelmaking pig iron by smelting blast furnace is obtained after hot metal is steel and iron. Steel and iron is mainly the temperature and composition of hot metal (mainly (P, S, Si) are required. When the iron composition is not up, can not meet the requirements of steelmaking, he cast iron, in steel, a small amount of to use, as scrap.
The biggest difference between pig iron and cast iron is that the pig iron has no requirement for the metallographic structure of the tissue