Nominal chemical composition
Chemical composition according to EN 573-3
- EN 573-3: EN AW-6063
- USA standard ANSI H35.1: 6063
- Teal Sheet (Aluminum Association): 6063
- Unified Numbering System (UNS): A96063
- ISO 209: 6063 (to 2007 Year by ISO 209-1 – AlMg0,7Si)
- Japan: A6063
- DIN 1725-1 (canceled): none
- series – 6xxx
- Heat hardenable
- The main alloying elements – magnesium and silicon, without special additives.
- hardening phase – intermetallic compound Mg2Si. At nominal chemical composition and complete dissolution of the alloying elements of this amount of the reinforcing compound is about 1 %, without excessive silicon content.
- Any other elements considered as impurities.
- The absence of corrective additives can create difficulties in controlling grain growth after heating for quenching and quenching .
- Typical conditions: T5, T6 and T66.
- The place of alloy 6063 among other 6xxx series alloys are shown . in the figure below.
pressed aluminum profiles:
- Enclosing constructions, such as windows, facade constructions, enter the store, winter gardens.
- tubes, rail, sport equipment.
- irrigation pipes
- Bodies of trucks and vans 
The mechanical properties of the alloy 6063
Normalized mechanical properties
Typical mechanical properties
Tensile modulus - 68300 MPa.
shear modulus - 25800 MPa.
compressive modulus - 69700 MPa.
2,69 g / cm3 at 20 ° C
melting and crystallization temperature
Alloy liquidus temperature 6063: 655 ° C
the solidus temperature of the alloy 6063: 615 ° C
The coefficient of linear thermal expansion
Linear: 23,4 μm / (m ° C) in the range from 20 to 100 ° C.
Volume: 67∙10-6 m3/(m3 ∙ ° С)
- Good arc-welded under inert gas, in particular, argon arc welding, as non-consumable electrode (GTAW-TIG), and consumable electrode (GMWA-MIG).
- Conventional welding alloy - 4043.
Groove weld strength
Weld strength is an important factor in selecting the right filler alloy. The heat of welding softens aluminum alloys, adjacent to the weld, if they are in any state, except annealed. In most groove welds, the base alloy HAZ will control the strength of the joint after welding (Fig.. 1)
For complete annealing of heat treatable alloys, including, alloy 6063, required from 2 to 3 hours at their annealing temperature combined with slow cooling. This does not happen when welding., and the HAZ will consist of several stages of dissolution and varying degrees of precipitation depending on thermal conditions, as shown in pic. 2. The degree of softening of the HAZ is very sensitive to the maximum temperature. reached in a certain place, as well as the time at this temperature .
Alloy 6063 refers to 6XXX series alloys (Al-Mg-Si). These alloys, containing Mg and Si are easily heat treatable. is he 6063 has relatively low volume fractions of Mg and Si and therefore Mg2Si completely dissolves during solid solution treatment and then precipitates during aging.
415 ° C.
520 ° C.
175 ° C. 8 hours.
In the state T4.
The cooling rate after extrusion should be high enough, to keep Mg and Si in solid solution. In this case, the mechanical properties will be maximum due to the precipitation of Mg2Si particles during subsequent aging (Fig. 3).
Cooling rate for series alloys 6000 determined by the transverse dimension of the profile and the cooling medium, such as:
- calm air
- water-air mixture
Table 5 typical cooling rates shown, which are required for effective hardening of profiles from alloys of the series 6000, including, alloy 6063 .
Fig. 3 – Diagrammatic sketch of press heat treatment cycle for 6063 alloy 
Aluminum alloy 6063
- 0,15-0,35 % Fe; 0,30-0,6 % And; 0,6-0,9 % Mg
- Strength properties slightly higher, than an alloy 6063 (on 15-25 MPa for condition T6) without reducing the quality of anodizing
Aluminium alloy 6463
- 0,15 % Fe; 0,20 % Cu
- Strength properties below, than an alloy 6063
- It is used to obtain a shiny surface anodized.
Alloy 6063 in Eurocode 9 (EN 1999-1-1)
Table 5 – Keys 
- The material properties given in this section are specified as characteristic values. They are based on the minimum values given in the relevant product standard (Table 6) 
- Characteristic values of the proof strength f0 and the ultimate tensile strength fu for aluminium alloy 6063 for a range of tempers and thicknesses are given in Table 7 for sheet, strip and plate products; Table 8 for extruded rod/bar, extruded tube and extruded profiles and drawn tube .
- Aluminum and Aluminum Alloys, ed. J. R. Davis – 1996
- TALAT Lecture 4204 – Design Aspects
- EN 1999-1-1:2007 Eurocode 9: Design of aluminium structures – Part 1-1 : General structural rules
- Carl V. Lynch, Aluminum Extrusion Technology Seminar, Chicago, 1969