PURPOSE: To obtain a Cu alloy having superior resistance to cavitation erosion, pitting corrosion and crevice corrosion by hot working a Cu alloy ingot having a specified composition contg. very small amounts of B and V besides Ni, Fe, Cr and Mn and carrying out quenching under specified conditions.

CONSTITUTION: A Cu alloy consisting of, by weight, 14W20% Ni, 0.5W2% Fe, 0.1W1% Cr, 0.2W1% Mn, 0.0005W0.01% B, 0.001W0.1% V and the balance Cu with inevitable impurities is cast into an ingot. This Cu alloy ingot is hot worked and quenched at ≥1,200°C/min cooling rate to at least 500°C. The precipitation of Fe is practically inhibited by the quenching, so a Cu alloy contg. Fe solubilized in a supersatd. state is formed. The alloy is then subjected to final annealing. At this time, it is cooled at ≥60°C/min cooling rate from 750°C to 500°C. By this method, a corrosion resistant Cu alloy causing no deterioration in the pitting corrosion resistance even in case of >1% Fe content is obtd.