Aluminium Alloy - Austral Wright Metals

Product Data Sheet – Aluminium Alloys

Aluminium 5083  UNS-A95083

Aluminium alloy 5083 contains 5.2% magnesium, 0.1% manganese and 0.1% chromium. In the tempered condition, it is strong, and retains good formability due to excellent ductility. 5083 has high resistance to corrosion, and is used in marine applications. It has the low density and excellent thermal conductivity common to all aluminium alloys.

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Typical Applications require a weldable alloy of high to moderate strength, with good corrosion resistance. Marine applications, unfired welded pressure vessels, TV towers, drilling rigs, transportation equipment, armour plate.

 

Chemical Composition

AS/NZS 1734 Aluminium and aluminium alloys – Flat sheet, coiled sheet and plate.

Element %
Aluminium
Balance
Mangnesium
4.0 – 4.9
Manganese
0.40 – 1.0
Chromium
0.05 – 0.25
Silicon
0.40max
Element %
Iron
0.40 max
Copper
0.10 max
Others (each)
0.05 max
Others (total)
0.15 max

 

Mechanical Properties

AS/NZS 1734 Aluminium and aluminium alloys – Flat sheet, coiled sheet and plate.

Temper 0.2% Proof Stress, MPa min Tensile Strength, MPa Elongation % min
O (annealed) 125 – 200 275 – 350 14
H112 125 275 10
H116 215 305 10
H321 215 – 295 305 – 385 10

† For information only, proof stress is not specified or measured except by prior agreement

‡ Minimum elongation, actual value depends on thickness – thicker gauges have higher elongation

 

 

Key To Tempers

Temper
Condition
O
Annealed (soft)
H1x
Strain hardened only
H3x
Strain hardened and then stabilised (ie. low temperature heat treated to pre-empt natural ageing, by reducing strength and increasing ductility)
Second digit: (x)
8
full hard
4
½ hard
6
¾ hard
2
¼ hard

Equivalent Specifications

USA: AA 5083; UK: BS 5083; Germany: DIN AlMg4.5Mn; Europe: EN AW-A 5083; Japan: 5083; JIS A5083P; France: NF A5083; ISO: Al Mg4.5Mn0.7.

The properties in this data sheet meet Australian/New Zealand Standard AS/NZS 1734:1997 Aluminium and aluminium alloys – Flat sheet, coiled sheet and plate (equivalent to BS EN 573-1).

Alloy 5083 can be supplied to meet other national standards.

 

Description Aluminium 5083 is a strong magnesium-manganese-chromium-aluminium alloy. It can be hardened by cold work, but is not heat treatable to higher strength. It has good ductility for the strength level, better than most other 5000 series alloys (see figure).

Austral Wright Metals can supply this alloy as plate, sheet and strip. See Austral Wright Metals Catalogue for normal stock sizes and tempers.

Corrosion Resistance Alloy 5083 has excellent resistance to general corrosion, and is used in marine applications. Resistance is excellent in aqueous solutions in the pH range 4 – 9. The corrosion resistance of aluminium alloys relies on a protective surface oxide film, which when damaged is readily repaired by the rapid reaction between aluminium and oxygen. However, the high reactivity of the base metal can give rapid corrosion if the film cannot be repaired, so aluminium alloys are not suitable for use with reducing media. Alloy 5083 can be anodised to improve the corrosion resistance by thickening the protective surface film.

Alloy 5083 can be susceptible to exfoliation corrosion in severe applications. Material in the H116 temper is least susceptible, and passes the ASTM G66 Exfoliation Susceptibility Test (ASSET Test). AS 1734 suggests alloy 5083 should not be used above 65°C.

Since aluminium is a reactive metal, it may corrode more quickly when in electrical contact with most other metals. The prediction of galvanic corrosion is complex; please consult Austral Wright Metals for specific advice.

Pressure Vessels AS1210 Pressure Vessels prequalifies alloy 5083 for pressure service for temperatures up to 65°C in the O, H112 & H321 tempers.

Physical Properties

Property
At
Value
unit
Density
20°C
2,660
kg/m³
Weight
20°C 2.66 x thickness in mm
Melting Range
574 – 638
°C
Modulus of Elasticity
Tension
20°C
70.3
GPa
Torsion
20°C
26.4
GPa
Compression
20°C
71.7
GPa
Mean Coefficient of Expansion
20°C
24.2
x 10 -4 / °C
Thermal Conductivity
25°C
120
W / m. °C
Electrical Resistivity
20°C
59.5
nano-ohm . m
Electrical Conductivity
(all tempers)
20°C
29
% IACS

 

Fabrication Aluminium 5083 is readily cold formable, as it is ductile. Forming loads and tool & press wear are generally less than with carbon steel. For piercing and blanking the punch to die clearance should be about 7% of the thickness per side for temper O, 7.5% for other tempers.

 

Indicative Minium Bend Radii

for 180° and 90° cold bends at 90° to the rolling direction

t = thickness

Temper
180° bend 90° bend
up to 1.5mm over 1.5mm 1.6 3.2
O 1.0 t 1.0 t 1.5 t
H116
0 t
0 t
1 t
1½t
H321
0 t
1 t
1½ t
2t

Welding Alloy 5083 is readily welded by the TIG and MIG processes using 5183, 5356 or 5556 filler alloys. Welding the H116 temper will reduce the tensile and yield strengths in the heat affected zone to those of the annealed condition. Aluminium must be very dry & clean to avoid contamination & porosity of the weld. It is essential that all traces of flux used in welding or brazing are removed by scrubbing with hot water.

Heat Treatment Alloy 5083 is annealed at 350°C, time at temperature and cooling rate are unimportant. Stress relief is rarely required, but can be carried out at about 220°C. If loss of strength is of concern, stress relief tests should be conducted.

 

Comparison of Yield Strength and Elongation

with magnesium content for commercial alloys – annealed temper.

Aluminium Alloys - yield strength

 

Characteristics

Corrosion Resistance
Very Good
Formability
Good (H116)
Weldability
Very Good
Anodising
Fair
Machinability
Fair
Brazeability
Poor

5083 is anodised for corrosion protection only

 

 

The technical advice and recommendations made in this Product Data Sheet should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. Austral Wright Metals assumes no liability in connection with the information in this Product Data Sheet. Austral Wright Metals supplies a comprehensive range of stainless steels, copper alloys, nickel alloys and other high performance metals for challenging service conditions. Our engineers and metallurgists will be pleased to provide further data and applications advice.

 

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