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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.
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"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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