5083 aluminum is a medium-strength alloy containing magnesium, manganese, and chromium. It belongs to the 5000 series, known for its non-heat-treatable properties. Instead of being heat-treated, 5083 gains strength through a controlled rolling process following full annealing.
This alloy is highly valued for its exceptional ductility relative to its strength, making it stand out within the 5000 series. It is commonly used in engineering and fabrication where corrosion resistance and dimensional stability are critical.
Machinability of 5083
Machining 5083 aluminum is generally straightforward, similar to other aluminum alloys. However, it can produce sticky chips, so using ample coolant is essential to minimize galling and tool fusion.
Optimal results are typically achieved using high-rake, high-helix cutters with light cuts, higher speeds, and feeds. Since alloy content may vary, settings may need to be adjusted depending on the batch.
For CNC turning, high-frequency cycles and pecking routines are recommended to break long swarf and improve chip control. Milling tends to be less problematic in this regard, and thread milling is preferred over tapping to ensure cleaner and more consistent threaded holes.
Equivalent Designations and Trade Names
You might find 5083 aluminum under different standards:
International designations: AA 5083 (USA), BS 5083 (UK), DIN AlMg4.5Mn (Germany), EN AW-A 5083 (Europe), JIS A5083P (Japan), NF A5083 (France)
Common codes: Al Mg4.5Mn0.7, GM41, A95083, BS N8, QQ-A-200/4, DIN 3.3547, UNS A95083
Tooling Plate Variant
5083 is available as a cast tooling plate designed for stability and flatness. It has a uniform microstructure, low internal stress, and a ground finish, usually supplied with a protective plastic film. This variant is often chosen for base plates, jigs, fixtures, and machine frames where precision and reliability are paramount.
Key Attributes
Superior performance in extreme environments
Highest strength among non-heat-treatable aluminum alloys
Maintains excellent strength even after welding
Highly resistant to seawater and industrial chemicals
Not suitable for applications exceeding 65°C
Common Applications
Enclosures
Piping, tubing & fittings
Fasteners & hardware
Tanks, containers & pressure vessels
Rail cars & coaches
Shipbuilding
Vehicle bodies
Tipper truck bodies
Mine skips & cages
Building & architectural products
Electrical components
Packaging & containers
Food processing machinery & equipment
Finishing & Treatments
5083 aluminum is suitable for anodizing, offering good protection. Options include:
Natural sulfuric anodize
Color sulfuric anodize
Natural hard anodize
Color hard anodize
Example Stock Sizes
5083 Sheet: 1250 mm x 2500 mm, Thickness: 0.6 mm to 5.0 mm
5083 Plate: 1250 mm x 2500 mm and some 1500 mm x 3000 mm, Thickness: 4.0 mm to 80 mm (¼ inch to 3.14 inch)
5083 Round Bar: Manufactured in 3000 mm lengths, Diameter: ⅜ inch to 10 inch
Technical Properties
Density: 2.65 g/cm³
Melting Point: 570°C
Thermal Expansion: 25 x 10^-6 /K
Modulus of Elasticity: 72 GPa
Thermal Conductivity: 121 W/m·K
Electrical Resistivity: 0.058 x 10^-6 Ω·m
Mechanical Properties (O & H111 Temper)
Sheet (0.2 - 6.3 mm thick):
Proof Stress: 125 Min MPa
Tensile Strength: 275 - 350 MPa
Hardness Brinell: 75 HB
Plate (6.3 mm to 80 mm):
Proof Stress: 115 Min. MPa
Tensile Strength: 270 - 345 MPa
Hardness Brinell: 75 HB
Plate (80 mm to 120 mm):
Proof Stress: 110 Min MPa
Tensile Strength: 260 Min MPa
Hardness Brinell: 70 HB
Elongation: 12 Min %
Typical Chemical Composition (Weight %)
Manganese: 0.40 - 1.00%
Iron: 0.00 - 0.40%
Copper: 0.00 - 0.10%
Magnesium: 4.00 - 4.90%
Silicon: 0.00 - 0.40%
Zinc: 0.00 - 0.25%
Chromium: 0.05 - 0.25%
Titanium: 0.15%
Aluminum: Balance
Notes for Designers
The size range and availability of 5083 are more restricted compared to 6082 aluminum.
Flatness and thickness tolerances can vary, especially for extruded plate and bar (up to +1 mm on thickness tolerance over a 2000 mm length).
Plate may be stored in large sheets, resulting in scratches or gouges on stock faces, which should be considered for customer-facing components.
When machining thicker material, consider the cost implications.
For threaded holes or assemblies under stress, using wire thread inserts may be beneficial.
Consult with competent subcontractors for fixturing arrangements if components will undergo plating or finishing.
This version of 5083 is an excellent choice for demanding applications, offering exceptional performance in various sectors, including marine, transportation, construction, and more.
