COPPER-BASE ALLOY CASTING WITH REFINED CRYSTAL GRAINS

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Mass % to, cubic : 69-88%, Si : 2-5%, Zr : 0.0005-0.04%, P : 0.01-0.25% and containing, satisfies 60≤Cu-3.5 × Si-3 ×P≤ 71, made of boron with the balance consisting of Zn and unavoidable impurities, solidified melt average crystal grain diameter of 100 micro m hereinafter and, ([...]) tissue on, on α, κ γ phase and total rate phase has an area at least 80%. Milligram : 0.001-0.2%, B : 0.003-0.1%, C : 0.0002-0.01%, Ti : 0.001-0.2% and rare earth elements : 0.01-0.3% selected from the group consisting of at least 1 may further include any species.