Wrought iron, steel, cast iron, cast iron, according to the content of the carbon? How many?
That is not all according to the carbon content is divided. Because the carbon content of iron and iron.
Iron is almost a smelting furnace and cast iron products. Two smelting products, generally with silicon, manganese and other elements in pig iron based, often also need to be nurtured, spheroidization, compacted and heat treatment process.
According to the carbon content, but not all. The wrought iron should be called industrial pure iron, the carbon content is below 0.02%, the carbon content of steel at 0.02-2.11%, the carbon content of pig iron in about 2.5-4.3%, and the carbon content of iron in 2.11-4%.