C.S density is 7.85 kg/m^3
it is wrong. the correct density for c.s. is 7.85 kg/dm3
the CS density is normally given as 7.85gm/cm^3 or 7850 kg/m^3
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Typically mild steel can withstand vibration better because it has a higher density than the more brittle cast iron but cast iron may be better at absorbing vibrations than mild steel, due to its lower density.
The density of steel varies depending on the alloy. (Steel itself is basically an alloy of iron and carbon.) Mild steel has a density of about 7.75 g/cc at room temperature and around 7.00g/cc in liquid state(Most studies reveal that the density of steel in liquid is about 90% than in solid state). The "world" of steel is a large one, and a variation will be encountered when investigating different alloys.
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Gates are made from mild steel, because mild steel is relatively easy to change shape of, is rather cheap and quite strong.
Galvanization is just a surface treatment, and says nothing about the strength of the core material. You could have mild steel, one piece galvanized and one not, and they'd be equally strong.