Carbon fiber is really strong. It isn't super easy to fabricate, but it isn't super hard to make it, either.
It is a cheap and abundant metal that is easy to cast, machine, work with. It is also strong and easy to combine with other metal to make different alloys of steel.
concrete.
Bronze was used because it was a strong metal that was easy to work with.
Alloy it or work harden it.
because its a strong metal
Because it was a strong metal.
Special steels
It is a very strong nonbioreactive metal.
Yes metal is generally strong.
Steel because it's strong
Easy! gunpowder+metal.. Hope this helps :D (im sure it does)
It's light enough, cheap enough, strong enough and easy enough to work with.