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 : 0.01 to 0.25%% and satisfies 60 <= Cu - 3.5 × Si - 3 × P <= 71, with the balance consisting of Zn and unavoidable impurities. The average grain size after melting and solidification is not more than 100 μm. Regarding the phase structure, the percentage total area of α phase, κ phase, and γ phase is not less than 80%%. At least one element selected from the group consisting of Mg : 0.001 to 0.2%%, B : 0.003 to 0.1%%, C : 0.0002 to 0.01%%, Ti : 0.001 to 0.2%%, and rare earth element : 0.01 to 0.3%% may be further contained. © KIPO & WIPO 2007