What is the difference between pig iron and cast iron?
Cast iron in carbon flake graphite form exists, its fracture is gray, usually known as gray iron. Because of its soft and lubricated graphite, casting pig iron has good cutting, wear resistance and casting properties. But its tensile strength is not enough, it can not be forged, and can only be used to make a variety of castings, such as casting all kinds of machine tools, bed seat, iron pipes and so on. Pig iron generally refers to the carbon content of iron in 2~4.3% alloy, also known as cast iron. In addition to containing carbon, pig iron also contains silicon, manganese and a small amount of sulfur, phosphorus and so on, it can be cast can not be forged. Cast iron in carbon flake graphite form exists, its fracture is gray, usually known as gray iron. Because of its soft and lubricated graphite, casting pig iron has good cutting, wear resistance and casting properties. But its tensile strength is not enough, it can not be forged, and can only be used to make a variety of castings, such as casting all kinds of machine tools, bed seat, iron pipes and so on.
The main products are iron for steelmaking continuous casting | blast furnace ironmaking, its production accounts for more than 90% of the output of blast furnace pig iron. In the modern steel production mainly in high temperature molten iron (1350 to 1400 DEG C) form for BOF steelmaking. The basic chemical composition of pig iron is iron (94% ~ 95%), and the rest are 5 conventional elements, namely carbon, silicon, manganese, phosphorus and sulfur, as well as some trace elements and some peculiar elements.
Pig iron is cast iron: carbon content is greater than 2.1%. White cast iron is used in steel making; grey cast iron is used for casting; ductile iron is good in its strength, plasticity and toughness because of its spherical arrangement of graphite; it can make mechanical parts.
