Are you saying that the metal was used because it is strong or because it symbolized strength? or both?
I read somewhere what all the metal in the temple symbolized and can not remember but the author claimed that all the metal reprisented something. The only one I can remember is gold symbolized deity.
So Moses made a bronze serpent, and put it on a pole; and so it was, if a serpent had bitten anyone, when he looked at the bronze serpent, he lived
Numbers 21:9
His body was like beryl, his face like the appearance of lightning, his eyes like torches of fire, his arms and feet like burnished bronze in color, and the sound of his words like the voice of a multitude.
Daniel 10:6
Is it significant that Jesus is reprisented with bronze? And there are several times that feet are bronze, why?
Their legs were straight, and the soles of their feet were like the soles of calves’ feet. They sparkled like the color of burnished bronze.
Ezekiel 1:7