Steel refers to an alloy of iron and other elements, mainly carbon, that is extensively applied in construction and other applications due to its extreme tensile strength and marginal cost.
The carbon content of steel varies from 0.002% and 2.1% by weight for plain iron–carbon alloys.
Variations in values are based on alloying elements like manganese, chromium, nickel, iron, tungsten, carbon and so on. Fundamentally, steel stands for an iron-carbon alloy that does not sustain eutectic reaction.
This construction video presents some useful construction tips for calculating total weight of steel on the basis of unit weigh as well as various diameters like 8mm, 12mm, 16mm, 20mm, 25mm.
The formula is = D2 /162.162 = Kg/m here, d denotes diameter.