Pig iron bars can be created at a smelter by a dwarf with the furnace operating labor activated.
The recipe for pig iron is: one iron bar, one flux material and one fuel create one pig iron bar. Note that this fuel is part of the reaction.You will need another item of fuel (coke or charcoal, but not wood) to heat the smelter unless you're using a magma smelter.
Pig iron is mainly used as a component in the manufacture of steel but can also be used for buildings and constructions that allow bars and have no restrictions on what type of bars to use. Dwarves can have a preference for pig iron and will be happier in a room whose floors and walls are made of it. Keeping a few spare pig iron bars may be marginally useful for strange moods.
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After years of extensive dwarven research, scientists have concluded that no, pig iron is not related to pigs in any way, and is therefore impossible to craft into ☼steel bacon☼.
[STATE_NAME_ADJ:LIQUID:molten pig iron]
[STATE_NAME_ADJ:GAS:boiling pig iron]