Pig iron is the intermediate product of smelting iron ore with a high-carbon fuel such as coke, usually with limestone as a flux. Charcoal and anthracite have also been used as fuel. Pig iron has a very high carbon content, typically 3.5–4.5%, which makes it very brittle and not useful directly as a material except for limited applications.
The traditional shape of the molds used for these ingots was a branching structure formed in sand, with many individual ingots at right angles to a central channel or runner. Such a configuration is similar in appearance to a litter of piglets suckling on a sow. When the metal had cooled and hardened, the smaller ingots (the pigs) were simply broken from the much thinner runner (the sow), hence the name pig iron. As pig iron is intended for remelting, the uneven size of the ingots and the inclusion of small amounts of sand caused only insignificant problems considering the ease of casting and handling them.
Famous quotes containing the words pig and/or iron:
““Eh Bien you like this sacred pig of a country?” asked Marco.
“Why not? I like it anywhere. It’s all the same, in France you are paid badly and live well; here you are paid well and live badly.””
—John Dos Passos (1896–1970)
“In the course of history, men come to see that “iron necessity” is neither iron nor necessary.”
—Friedrich Nietzsche (1844–1900)