pig iron

noun
1.
iron tapped from a blast furnace and cast into pigs in preparation for conversion into steel, cast iron, or wrought iron.
2.
iron in the chemical state in which it exists when tapped from the blast furnace, without alloying or refinement.

Origin:
1655–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pig iron
 
n
crude iron produced in a blast furnace and poured into moulds in preparation for making wrought iron, steels, alloys, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
There are plans to build a pig iron plant on, or near, this property.
Coke and iron, the raw materials, were combined in a blast furnace to make
  liquid pig iron.
The blast furnace product is usually referred to as pig iron.
They are improving the quality of the steel they make by melting pig iron along
  with the scrap.
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