Linked from
The 10 pages that link to Pig iron, each with the reason it gives.
SteelmakingRelated: It is the principal hot-metal feed for the basic oxygen route.
Blast furnaceBroader topic: The furnace’s molten iron is commonly cast or transferred as pig iron.
Cast ironRelated: It is a common molten feedstock for making cast iron.
Coke (fuel)Broader topic: It is the molten iron product made in the coke-fueled blast furnace.
Bessemer processRelated: It is the molten feedstock whose carbon and impurities the process removes.
IronworkingBroader topic: Its high carbon content makes it brittle and calls for further refining.
Henry BessemerRelated: It was the principal feedstock the Bessemer process converted into steel.