STEELS’S CATALOG

Aluminium and copper-alloys

Aluminium and its alloys, commonly known as « light alloys », are used in industry for the excellent relationship they

demonstrate between their density and their mechanical properties.

The density of aluminium alloys is three times lower than that of a carbon steel and 3.3 times lower than that of a copper.

Their thermal conductivity is remarkable; it is 13 times higher than that of a steel.

Their electrical conductivity is very good; of the order of 63% of that of copper, but it is double in weight of an equiv- alent metal.

These alloys also have good resistance to ambient corrosion.
They are obtained by a casting process and can be transformed by rolling or forging.

Like steels, they are classified into families and groups according to the physical and mechanical criteria sought for their use.

The main families are:
• Unalloyed aluminium: 1000 family
• Aluminium-copper alloys: 2000 family
• Aluminium-Manganese alloys: 3000 family
• Aluminium-silicon alloys: 4000 family
• Aluminium-magnesium alloys: 5000 family
• Aluminium-magnesium-silicon alloys: 6000 family • Aluminium-zinc-magnesium alloys: 7000 family

Depending on the grades, their mechanical characteristics can be optimised by heat treatment solution , quenching aging, and by mechanical hardening treatments, but they are less compared than those of steels and they remain limited.

(Refer to the table of metallurgical states at the end of the catalogue)

The mechanical characteristics of these alloys are directly related to their method of production and the dimensions of the products; it is recommended that these parameters be taken into account before the machining of large parts.