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For questions related to the alloy steel: Its production, material properties and applications. The carbon content of steel is between 0.002% and 2.1% by weight for plain iron-carbon alloys.

4 votes

Aluminum weight saving

Steel did not qualify. But this is admittedly a rare example. The other answers which mention the second moment of inertia are spot-on, though. … If you build a load-carrying shell you can either pick aluminium or steel, but the steel sheet thickness would require a much narrower stiffener spacing in order to avoid buckling of skins loaded in compression …
Peter Kämpf's user avatar