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Iron metal has been used since ancient times, although copper alloys, which have lower melting temperatures, were used even earlier in human history.
Crude iron metal is produced in blast furnaces, where ore is reduced by coke to pig iron, which has a high carbon content.As it cools further to 1394 °C, it changes to its γ-iron allotrope, a face-centered cubic (fcc) crystal structure, or austenite.At 912 °C and below, the crystal structure again becomes the bcc α-iron allotrope.Fresh iron surfaces appear lustrous silvery-gray, but oxidize in normal air to give hydrated iron oxides, commonly known as rust.Unlike the metals that form passivating oxide layers, iron oxides occupy more volume than the metal and thus flake off, exposing fresh surfaces for corrosion.
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