pig iron

raw iron, unrefined iron

For the DC Comics superhero Pig Iron, see Peter Porkchops. For the band see Pig Irön. Pig iron is raw iron, the immediate product of smelting iron ore with coke and limestone in a blast furnace. Pig iron has a very high carbon content, typically 3.5%, which makes it very brittle and not useful directly as a material except for limited applications.Pig iron is typically poured directly out of the bottom of the blast furnace through a trough into a ladle car for transfer to the steel plant in liquid form, referred to as "hot metal." The hot metal is then charged into a steel-making vessel to produce steel, typically with an electric arc furnace or basic oxygen furnace, by burning off the excess carbon in a controlled fashion and adjusting the alloy composition. Earlier processes for this included the Bessemer Process, open hearth furnace, finery forge, and the puddling furnace.
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Noun
1. crude iron tapped from a blast furnace
(hypernym) iron, Fe, atomic number 26
(hyponym) basic iron
(substance-holonym) wrought iron

What a large heavy piece of equipment is said to be made of
  

pig-iron /'pig,aiən/
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