2A17 aluminum is first eligible. Have 2 ××× alloys for industrial applications, with high strength and good cutting performance, but poor corrosion resistance. 2 ××× series aluminum is characterized by high hardness, which was originally the highest concentrations of copper, probably in about 3-5%. 2 ××× series aluminum is aviation aluminum, not often present in conventional industrial applications. China's current production is less 2 ××× series aluminum manufacturers. Quality can not be compared with other countries. Aluminum currently imported mainly from South Korea and German manufacturers. With the development of China's aerospace industry, 2 ××× series aluminum production technology will be further improved. Characteristics 2A17 aluminum - copper - typical hard lines of magnesium alloy, its composition is more reasonable, better overall performance. Many countries are producing the alloy, it is the largest amount of hard aluminum. Characteristics of the alloy: high strength, a certain heat resistance, can be used below 150 ° C working parts. Temperatures higher than 125 ° C, 2A20 introduction strength of the alloy is higher than the 7075 alloy. Hot state, annealing and quenching conditions forming the new performance is better than the heat treatment significantly enhanced the effect, but the heat treatment process demanding. Corrosion resistance is poor, but with aluminum coating can be effectively protected; welding easy to crack, but using a special welding process can also be riveting. Widely used in aircraft structures, rivets, card wheel hub, propeller components and various other structures. Uses 2A17 aluminum is usually applied rivets, general machinery parts, aircraft, ship, transport, building structures, transportation structures, propeller components and accessories. Chemical composition of iron (Fe): 0.30, magnesium (Mg): 0.25 ~ 0.45 Mn: 0.40 ~ 0.80 silicon (Si): 0.30 Zinc (Zn): 0.10 Titanium (Ti): 0.07 ~ 0.16 Chromium (Cr): 0.10, copper (Cu): 6.0 ~ 7.0 Zr: 0.10 ~ 0.25 V: 0.05 ~ 0.15 B: 0.001 ~ 0.01 aluminum (Al) balance the individual: 0.05 ~ 0.15 Mechanical Properties Tensile strength σb (MPa): 215 ~ 355 Elongation δ10 (%): 12 ~ 17 solution treatment temperature: 500 ℃ ~ 510 ℃ annealed cold material range:. 340 ℃ ~ 350 ℃ heat-treated materials annealing temperature:. 415 ℃.