Steel is an alloy element primarily made of iron, with caron conten of .02% to 1.7% by weight.
Carbon and other agent act as hardening agent, preventing the dislocations in iron atom crystal lattice fron sliding past one another.
Varying the amount of alloying elements and their distribution in the steel controls qualities such as the hardness, elasticity, ductility and tensile strength of resultant steel.
Steel with higher carbon content can be made harder and stronger than iron, but is also more brittle. The maximum solubility of carbon in iron is 1.7% by wieght at 1130 °C
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