'Iron' in the Bible

brought back the people who had lived in it, and put them to conscripted labor with saws, iron picks, and axes. David did this to every Ammonite city, and then David and his entire army returned to Jerusalem.

David also provisioned abundant supplies of iron for nails to build the doors for gates and to build clamps. Furthermore, he provided so much bronze it wasn't inventoried,

At great effort I have provided for the Temple of the LORD 100,000 gold talents, 1,000,000 silver talents, as well as bronze and iron beyond calculation, since there is so much of it. I've also provided timber and stone, but you'll need to obtain more.

gold, silver, bronze, and iron. So begin the work, and may the LORD be with you."

To the extent that I have been able to do so, I have provided supplies for the Temple of my God, including gold for what is to be made of gold, silver for what is to be made of silver, bronze for what is to be made of bronze, iron for what is to be made of iron, wood for what is to be made of wood, and great quantities of onyx, precious stones, antimony, colored stones, all types of other semi-precious stones, and plenty of marble.

They presented 5,000 gold talents and 10,000 gold darics for the work of the Temple of God, 10,000 silver talents, 18,000 bronze talents, and 100,000 iron talents.