base metal

noun
1.
any metal other than a precious or noble metal, as copper, lead, zinc, or tin. Compare noble metal, precious metal.
2.
the principal metal of an alloy.
3.
the principal metal of a piece underlying a coating of another metal; core.
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World English Dictionary
base metal
 
n
any of certain common metals such as copper, lead, zinc, and tin, as distinct from the precious metals, gold, silver, and platinum

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
They are to be demonetized as a base metal, and you know it.
Load-induced fatigue must be considered in the base metal at a welded
  connection.
Base metal microstructure in unfailed leg of the elbow.
The merchandise under consideration is several types of base metal picture
  hangers.
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