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发明公开
CN110249065A 易切削性铜合金及易切削性铜合金的制造方法 有权

易切削性铜合金及易切削性铜合金的制造方法
摘要：
本发明提供一种易切削性铜合金，该易切削性铜合金含有Cu：75.4～78.7％、Si：3.05～3.65％、Sn：0.10～0.28％、P：0.05～0.14％及Pb：0.005％以上且小于0.020％，且剩余部分包括Zn及不可避免的杂质，组成满足以下关系：76.5≤f1＝Cu+0.8×Si-8.5×Sn+P≤80.3、60.7≤f2＝Cu-4.6×Si-0.7×Sn-P≤62.1、0.25≤f7＝[P]/[Sn]≤1.0，构成相的面积率(％)满足以下关系：28≤κ≤67、0≤γ≤1.0、0≤β≤0.2、0≤μ≤1.5、97.4≤f3＝α+κ、99.4≤f4＝α+κ+γ+μ、0≤f5＝γ+μ≤2.0、30≤f6＝κ+6×γ1/2+0.5×μ≤70，γ相的长边为40μm以下，μ相的长边为25μm以下，α相内存在κ相。
摘要（英）：

A free-cutting copper alloy comprises 75.4-78.7% Cu, 3.05-3.65% Si, 0.10-0.28% Sn, 0.05-0.14% P, and at least 0.005% to less than 0.020% Pb, with the remainder comprising Zn and inevitable impurities. The composition satisfies the following relationships: 76.5<=f1=Cu+0.8*Si-8.5*Sn+P<=80.3; 60.7<=f2=Cu-4.6*Si-0.7*Sn-P<=62.1; and 0.25<=f7=[P]/[Sn]<=1.0. The area percentage (%) of respective constituent phases satisfies the following relationships: 28<=kappa<=67; 0<=gamma<=1.0; 0<=beta<=0.2; 0<=mu<=1.5; 97.4<=f3=alpha+kappa; 99.4<=f4=alpha+kappa+gamma+mu; 0<=f5=gamma+mu<=2.0; and 30<=f6=kappa+6*gamma1/2+0.5*mu<=70. The long side of the gamma phase is at most 40 [mu]m, the long side of the mu phase is at most 25 [mu]m, and the kappa phase is present within the alpha phase.

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