Pig Iron

• Pig Iron is the intermediate product of smelting iron ore.
• Pig Iron contains a large amount of carbon.
• Pig Iron can also be used to produce Gray Iron. 
• Pig Iron always contain  foreign substances, among which are Carbon, Silicon, Sulphur, Phosphorus and Manganese besides many others in smaller proportion.
• Pig Iron refers to the metallic product of a furnace that contains over 90% iron.