COPPER BASE ALLOY, AND CAST INGOT AND PART TO BE CONTACTED WITH LIQUID EACH USING THE ALLOY

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PROBLEM TO BE SOLVED : To provide a copper base alloy having mechanical properties comparable with or superior to those of a conventional bronze alloy (CAC406) available on the market while securing the machinability comparable with that of the CAC406 even if the contents of rare elements (Bi, Se and the like) being alternative components for Pb in the alloy are decreased by a correct perspective for true properties of the rare elements (Bi, Se and the like), and in which the occurrence of casting defects can be suppressed through the elucidation of the effect of the decrease in the alternative components (Bi, Se and the like) for Pb on the soundness of a cast product which has not been elucidated, and which is made inexpensively producible by the decrease of the rare elements as well, and to provide a cast ingot and parts to be contacted with a liquid each using the alloy. SOLUTION : In the copper alloy, the quantity of non-solid solution by alternative components for Pb is controlled to ≥1.0 Vol%, and the generation of casting defects is suppressed. In the copper alloy, preferably, the quantity of the non-solid solution is secured at least by Bi.