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A certain proportion of carbon (between 0.002% and 2.1%) produces steel, which may be up to 1000 times harder than pure iron.

Crude iron metal is produced in blast furnaces, where ore is reduced by coke to pig iron, which has a high carbon content.

The mechanical properties of iron and its alloys can be evaluated using a variety of tests, including the Brinell test, Rockwell test and the Vickers hardness test.

The data on iron is so consistent that it is often used to calibrate measurements or to compare tests.

Iron plays an important role in biology, forming complexes with molecular oxygen in hemoglobin and myoglobin; these two compounds are common oxygen transport proteins in vertebrates.

Iron is also the metal at the active site of many important redox enzymes dealing with cellular respiration and oxidation and reduction in plants and animals.

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It is the fourth most common element in the Earth's crust.Welcome to one of the most popular adult chat rooms in the world.Participate in public or private chat with thousands of friends or random strangers.At least four allotropic forms of iron are known as α, γ, δ, and ε; at very high pressures and temperatures, some controversial experimental evidence exists for a stable β phase.As molten iron cools past its freezing point of 1538 °C, it crystallizes into its δ allotrope, which has a body-centered cubic (bcc) crystal structure.Iron metal has been used since ancient times, although copper alloys, which have lower melting temperatures, were used even earlier in human history.