WHAT IS ALUMINUM ALLOY

An aluminium alloy is a chemical composition where other elements are added to pure aluminium in order to enhance its properties, primarily to increase its strength. These other elements include iron, silicon, copper, magnesium, manganese and zinc.  Alloys are assigned a four-digit number, in which the first digit identifies a general class, or series, characterized by its main alloying elements. 

EXTRUDED PRODUCT ALLOYS

Alloy Description Application
1050 1050 is a high purity non-heat treatable alloy with 99.5% aluminium content. These compositions are characterised by excellent corrosion resistance, high thermal and electrical conductivity, low mechanical properties and excellent workability. Iron and silicon are the major impurities. Use in electrical and chemical fields which require the highest available electrical conductivity performance
1070 1070 is a high purity non-heat treatable alloy with 99.70% aluminium content. These compositions are characterised by excellent corrosion resistance, high thermal and electrical conductivity, low mechanical properties and excellent workability. Iron and silicon are the major impurities. Use in electrical and chemical fields which require the highest available electrical conductivity performance
6060 6060 is one of the most common alloys of 6000 series. It is a heat treatable alloy with very good corrosion resistance and weldability.

It is an ideal alloy for every complex cross section and has a very good anodizing response.

It cannot be work hardened but is commonly heat treated to produce temper with a higher strength but lower ductility

  • Architectural applications including doors and windows frames
  • Electrical components and conduits
  • Tube for irrigation systems
  • Curtain walls
  • Lightning, furniture and picture frames
  • Carpet edging
  • Railings and fences
  • Applications where surface finish is important
6061 6061 is a heat treatable alloy with mechanical properties slightly lower than 6082. It has good corrosion resistance but the extruded surface finish is not as good as 6060.
  • Road and rail transport
  • Marine
  • Scaffold tube
  • Structural members
  • Cycling frames and components
  • Breathing gas cylinders for scuba diving and SCBA
6063 6063 is a heat treatable and weldable. It is commonly used for aluminium extrusion. It allows complex shapes to be formed with very smooth surface fit for anodizing.

Application required higher strength typically use 6061 and 6082 instead.

  • Architectural applications including doors frame, windows frame, roof, and sign frames
  • Cycling frames and components
6082 6082 has excellent corrosion resistance and the highest strength of the 6000 series structural alloys. The extruded surface finish is not as good as alloys such as 6060 and 6063

6082 has good weldability and is commonly used in marine applications

  • Highly stressed applications
  • Bridges
  • Cranes
  • Marine applications
  • Other transport applications

CHEMICAL COMPOSITION LIMITS

Alloy Si Fe Cu Mn Mg Cr Zn Ti V Each Total Al Minimum
Natural Impurity Limits for Wrought Unalloyed Aluminium
1050 0.25 0.40 0.05 0.05 0.05 0.05 0.03 0.05 0.03 99.50
1070 0.20 0.25 0.04 0.03 0.03 0.04 0.03 0.05 0.03 99.70
Registered Compositions
6060 0.30-0.6 0.10-0.30 0.10 0.10 0.35-06 0.05 0.15 0.10 0.05 0.15 Rem.
6061 0.40-0.8 0.7 0.15-0.40 0.15 0.8-1.2 0.04-0.35 0.25 0.15 0.05 0.15 Rem.
6063 0.20-0.6 0.35 0.10 0.10 0.45-0.9 0.10 0.10 0.10 0.05 0.15 Rem.
6082 0.7-1.3 0.50 0.10 0.40-1.0 0.6-1.2 0.25 0.20 0.10 0.05 0.15 Rem.

MECHANICAL PROPERTIES LIMIT – EXTRUDED WIRE, ROD AND BAR

Alloy Temper Thickness/Diameter (mm) Tensile Strength

ULTIMATE (MPa)
Min
YIELD (MPa)
Min
Elongation
(%min. 50mm)
1050 F Not Specified
1070 F Not Specified
6060 T4
T5
T6
< 25
5 < t < 25
5 < t < 25
120
140
170
60
100
140
14
6
6
6061 T1
T4
T6
< 12.50
All
5 < t < 25
180
180
260
95
110
240
16
16
8
6063 T4
T5
T6
< 25
3 < t < 25
3.2 < t < 25
130
150
205
70
110
170
14
8
8
6082 T5
T6
5 < t < 20
5 < t < 20
290
310
250
260
8
6

Source : The Aluminum Association ( International Alloy Designations and Chemical Composition Limits for
Wrought Aluminium and Wrought Aluminium Alloys, Jan 2015)