7005 aluminium alloy, an Al-Zn-Mg-Cu series super hard aluminum, has a general hardness around hrb150. The main alloy of 7000 series is zinc, with the composition ratio of 6%. 6061 alloy, on the other hand, belongs to the Al-Cu-Mg-Mn series. It’s a kind of forged aluminum with the hardness of hrb100.6000 series is mainly composed of magnesium and silicon, with …