2系铝合金即铝铜合金代表牌号有:2A11,2A12,2A13,2A14,
化学元素一成分2A11:硅si:0.700,铁Fe:0.7oo,铜Gu:3.8一4.8,锰Mn:0.4o一0.8o,镁Mg:0.4o一0.8o,铬Cr:0.o1o,镍Ni:0.o1o,
2A12成分:硅:0.50,铁:0.50,铜:3.8一4.9,锰:0.30一0.90,镁:1.2一1.8,铬:0.100,镍:0.010,锌:0.3oo,
2A13化学一成分:硅:0.70,铁:0.60,铜:4.5一5.0,锰:4.5一5.0,镁:0.30一0.50,铬:0.3o一0.5o,镍:0.3o一0.5o,锌:0.6oo,
2A14化学成分:硅:0.6一1.2,铁:0.70,铜:0.6o,锰:4.5一5.0,镁:0.4一0.8,铬:0.4一0.8,镍:0.10。