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Steel

Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material.

Varying the amount of carbon and its distribution in the alloy controls qualities such as the hardness, elasticity, ductility, and tensile strength of the resulting steel.

Note:   The above text is excerpted from the Wikipedia article "Steel", which has been released under the GNU Free Documentation License.
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August 5, 2015

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updated 12:56 pm ET