They add it to the new steel in the foundry..it actually strengthens the steel...Where i live at we have several john deere factorys...They use between 10 to 20,000lbs per day of copper...and thats just one foundry.
"Copper significantly improves the corrosion resistance of steel in marine and inland environments"
http://www.copper.org/publications/n..._cu_steel.html
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