'Iron' in the Bible

Now there was no iron-worker in all the land of Israel: for the Philistines said, For fear the Hebrews make themselves swords or spears:

So all Israel [went] down to [the] Philistines, each to have his plowshare, his mattock, his axe, and his iron plowshare sharpened.

For they had instruments for putting an edge on their ploughs and blades and forks and axes, and for putting iron points on their ox-driving rods.

And the staff of his spear was like a weaver's beam; and his spear's head weighed six hundred shekels of iron: and one bearing a shield went before him.