COPPER ALLOY AND METHOD FOR PRODUCTION THEREOF

摘要

A copper alloy which comprises two or more of Cr, Ti and Zr, the balance being Cu and impurities, wherein the particle diameter (X)(mum) of precipitates and inclusions being present in the alloy and having a particle diameter of 1 mum or more and the total number (N) (pieces/mm2) of the precipitates and inclusions satisfy the following formula (1): log N <= 0.4742 + 17.629 X exp (- 0.1133 x X). The copper alloy may further comprise Ag, P, Mg or the like in place of a part of Cu. A method for producing the above copper alloy which comprises cooling a cast pieces at a cooling rate of 0.5°C/s or more at least in the temperature range from the temperature immediately after the casting to 450°C. It is desirable that after the cooling the cast piece is worked in the temperature range of 600°C or lower or is subjected to a heat treatment wherein it is held in the temperature range of 150 to 750 °C for 30 sec or longer. It is most desirable that the work and the heat treatment are repeated.