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Wrought iron is purer than pig iron.

When purifying iron ore in a furnace furnace, air is passed through a "charge" of iron ore, limestone, and some form of carbon, charcoal or coal. This "smelting" process is a chemical change: the molten iron produced is tapped from the furnace as "pig" iron. Pig iron is iron with a high carbon content as well as some sulfur. Due to it's impurities pig iron has a lower melting point and is acceptable for casting but not forging.

Wrought Iron is made much the same way with the exception of the carbon source being used is coke, a purified form of bituminous coal. Coke being a purer form of carbon burns smokeless and imparts little to no carbon to the iron allowing more impurities to burn out. This byproduct is wrought iron. Wrought iron is acceptable for either casting or forging.

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13y ago

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