Aluminium Alloy 5083: Marine structural plate alloy.
The world's leading marine structural alloy. The highest strength of any non-heat-treatable aluminium and exceptional saltwater resistance make it the specification for hulls, cryogenic tanks and high-load marine welded structures.
What is Aluminium Alloy 5083?
Aluminium Alloy 5083 is the highest-strength non-heat-treatable aluminium alloy in commercial use, and the world's leading marine structural plate alloy. The high magnesium content (4.0–4.9 %) delivers exceptional strength and saltwater corrosion resistance, while manganese and chromium control grain structure and stress-corrosion behaviour. 5083 is the alloy specified for ship hulls, LNG tanks, offshore structures and any high-load marine welded fabrication where structural integrity in seawater cannot be compromised.
5083 welds exceptionally well with 5183, 5356 or 5556 filler; welded-joint strength is among the highest in the aluminium family. Cold forming is possible but requires more force than 5052. ASTM B928 ('H116', 'H321' tempers) certifies marine-grade resistance to exfoliation and stress-corrosion cracking.
Chemical & mechanical data.
Chemical composition
Mechanical properties
How 5083 performs.
Six performance dimensions, rated 1 to 5, to help architects, fabricators and engineers specify with confidence.
Where 5083 is specified.
- Ship hulls and superstructures
- Marine cryogenic tanks (LNG)
- Offshore platforms and helidecks
- Pressure vessels
- Mine-skips and railway carriages
- Armour plate (light)
- Cryogenic storage
Advantages
- Highest strength of any non-heat-treatable aluminium
- Outstanding seawater corrosion resistance
- Excellent welded-joint strength retention
- Performs at cryogenic temperatures
- ASTM B928 marine-certified availability
Limitations
- Not heat-treatable
- Should not be held above 65 °C for extended periods (sensitisation risk)
- Lower formability than 5052 due to higher Mg content
5083 is supplied to:
- ASTM B209
- ASTM B928 (marine)
- EN 485-2
- EN 573-3
Supplied to customer requirement.
Alloy 5083 is available in a full range of thicknesses according to customer requirement, with cut-to-length, slitting and custom configuration on request. Mill test certificates (EN 10204 3.1) are issued with every consignment.
Related aluminium alloys.
Marine & corrosion-resistant alloy
The most widely specified non-heat-treatable aluminium alloy. Outstanding saltwater corrosion resistance and fatigue strength make it the default for marine, chemical and architectural fabrication.
Marine alloy: bridging 5052 and 5083
A high-magnesium marine alloy that bridges 5052 and 5083, being stronger than 5052, more formable than 5083, and fully marine-certified.
European architectural & automotive sheet
The European 5xxx benchmark for tread plate, architectural cladding and automotive body panels, with excellent corrosion resistance, formability and weld response.
Send your 5083 requirement.
Tell us form (sheet / coil / plate / bar), temper, dimensions and tonnage. We will revert with mill availability and indicative pricing within one working day.