Mechanical properties and anodic reaction. Fine grain makes the depth of drilling performance is better, and the tool wear resistance is enhanced, and the thread rolling is more and more important. 7075铝棒化学成分 硅 Si :0.40 铜 Cu :1.2~2.0 镁 Mg:2.1~2.9 锌 Zn:5.1~6.1 锰 Mn:≤0.30 钛 Ti :≤0.20 铬 Cr:0.18~0.28 铁 Fe: 0.50 注:单个:≤0.05;合计:≤0.15 铝 Al :余量。