Steel is a ferrous material alloy that consists mainly of iron, with a little part of carbon, exactly between 0.1 and 1.76%. It’s found on the Earth’s crust only as iron ore combined with other elements such as oxygen or sulphur. Varying the amount of alloying elements you can control qualities such as hardness, ductility and tensile strength. Steel the most carbon it has, the harder and stronger it is, but it’s also less ductile than iron. Steel is really hard to mould but you can laminate and work it. Its main characteristics are its ductility, malleability, hardness and its medium resistance.
Steel is widely used in the construction of roads, railways, and other infrastructures like beams and girders, as you can see in the photo. Most large modern structures as stadiums, bridges and airports have a steel skeleton. In addition, it’s used in cars. Despite the increasing use of aluminium, steel is still the main material for cars bodies.
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