Extrusion Basic Metallurgy
Aluminium for extrusion is mostly alloys with the following serial numbers:
1000 series – Al
6000 series – Al + Mg + Si
7000 series – Al + Zn + Mg
The 6000 series has good extrudability and is often the optimal choice. Termed “soft alloys” due to their ability to be easily weld, these alloys have medium to high strength and offer good resistance to corrosion, even in marine environments. The bulk of the extruded material for load bearing constructions is made from these qualities. They are used for load bearing constructions both on land and at sea.