Residual Materials Inc.
Your full service metal recycling center.
Test the metal to see if its magnetic. If it sticks to the magnet, it is steel (ferrous); if the metal does not stick, it is non-ferrous.
Using your file, remove a small area of paint or plating to get to the base color of the metal. See the chart above to find the type of metal that fits by color and magnetic properties.
For more information check out the K&K Metal Youtube Channel for informatiove videos on commonly recycled items.