6005A aluminium alloy

Chemical composition

Nominal composition

Al-0,7Si-0,6Mg-MnCr

The standard composition

See Figure 1.

 Figure 1 – The fragment of Table 6 from EN 573-3 including 6005A aluminium alloy

The designations of 6005A aluminium alloy

• EN 573-3: EN AW-6005A и EN AW-Al SiMg (A)
• Teal Sheats – Aluminum Association: 6005A
• Unified Numbering System (UNS): А96005A
• ISO 209: 6005A
• DIN 1725-1 (canceled): AlMgSi0.7

Metallurgical characteristics

• Wrought
• Heat-treatable
• An average level of strength
• The strengthening component is the intermetallic compound Mg₂Si.
• When the proportion of the nominal chemical composition of this compound is 0,9 %, wherein the excess silicon content is 0,4 %.
• Manganese and chromium provide resistance to crystallization [2].
• Typical temper – T6: extruded sections are cooled with water after heating for quenching at 530 ºC and artificial aging at 175 ° C within 8 hours [2]
• Figure 2 shows the relationships of 6005A aluminium alloy with other alloys 6xxx series.

 

Figure 2 – The most used 6xxx series alloys including 6005A aluminium alloy [3]

Typical applications

• Extruded profiles and pipes, which require a higher level of strength, than can provide 6063 alloy
• Stairs
• Frame details, seats and suspension of passenger cars

Mechanical properties

Figure 3 – Requirements for the mechanical properties of pressed products from 6005A aluminium alloy according to EN 755-2

Physical properties

Density

• 2,70 g / cm³ at 20 °C

Thermal properties

Interval melting temperature

• 605 to 655 °C

Coefficient of thermal expansion

23,6 μm / (m °C) in the range from 20 to 100 °C.

Technological properties

• Compressibility: medium
• Machining by cutting: medium to mediocre
• Weldability: good
• Formability: medium

Alloy modification

• 6005 alloy, basic
• 6005B alloy.

Sources:

1. Aluminum and Aluminum Alloys, ed. J. R. Devis – AMS International, 1993
2. Aluminium & Car: design, technology, innovation – Edimet Spa, 2005
3. Influence of Al Microstructure on Hard Anodising Quality – Profile Material /  Tom Hauge, Hydro Aluminium, Norway – 2014