Anyone familiar with "copper" grounding rods? What I believed to be solid copper was actually copper clad steel. Ordinarily, I'd of thought the steel would have only enough carbon in the mix to actually call it steel. When I cut a shank off to do what I hoped would be copper work, the cutting wheel on the old angle grinder through a bunch of really nice complex bright yellow sparks. So I forged a 3 inch section down to about 3/32 inches, brought it to critical and quenched in water. Then I laid it across the anvil and gave it a good wack. Nothing . Another, and another wack. A slight bend. Not only that, but the piece bounced and rebounded not unlike a spring. So I'm confused. Passed the spark test, failed (?) the quench/snap test, but acts like spring steel. Also the copper remained on the steel. Can/would someone clear this up for me?