Beryllium copper
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Beryllium copper is a metal alloy that contains 98% copper 2% beryllium, has significant metalworking advantages and great operating performance qualities.
This is a highly ductile alloy which can be precisely stamped and shaped into a wide variety of complex patterns including very small yet critical parts. The addition of beryllium allows this alloy to be heat-treated into being a very strong and durable metal and also gives the alloy a high electrical conductivity. It is used in springs and to make other parts that need to retain their shapes over long periods of time while being subjected to repeated use.de:Kupferberylliumbronze