PURPOSE: To impart high electric conductivity, excellent workability and heat resistance and to suppress the lowering of strength at high temp. by incorporating specified amts. of Nb and Zr into a Cu alloy.

CONSTITUTION: This high strength and high electric conductivity Cu alloy consists of 0.5-10wt.% Nb, 0.0050-1.0wt.% Zr and the balance Cu with inevitable impurities. In the compsn., Nb exists as dendrites in this Cu alloy and is made fibrous by drawing to enhance the strength of this Cu alloy, and Zr enters into solid soln. in the Cu matrix to raise the softening temp. and to enhance the heat resistance.