COPPER-BASE ALLOY CASTING WITH REFINED CRYSTAL GRAINS.

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This invention provides a copper-base alloy casting with refined crystal grains, which comprises by mass Cu : 69 to 88%, Si : 2 to 5%, Zr : 0.0005 to 0.04%, and P : 0.01to 0.25% and satisfies 60 Cu - 3.5 u Si - 3 u P 71, withthe balance consisting of Zn and unavoidable impurities. The average grain sizeafter melting and solidification is not more than 100 Am. Regarding thephase structure, the percentage total area of phase, phase, and phase is not less than 80%. At least one element selected from the groupconsisting of Mg : 0.001 to 0.2%, B : 0.003 to 0.1%, C : 0.0002 to 0.01%, Ti : 0.001to 0.2%, and rare earth element : 0.01 to 0.3% may be further contained.