Good Weldability Al-Mg Alloy 5086 Aluminum Alloy Plate For Marine
5086 is the preferred hull material for small aluminium boats or larger yachts. Its high
strength and good corrosion resistance make it an excellent match for yachting. 5086
has a tendency to undergo Stress corrosion cracking and is not used much in aircraft
construction as a result.
Key Properties of 5086 Aluminum Alloy
♦ Moderate-to-High Strength
Tensile Strength: 240–300 MPa (depends on temper)
Yield Strength: 110–240 MPa (O temper to H116/H321)
Good fatigue resistance for marine dynamic loads.
♦ Excellent Corrosion Resistance
Resists seawater, salt spray, and marine atmospheres (Mg content: 3.5–4.5%).
Better than 5xxx alloys with lower Mg (e.g., 5052).
♦ Good Weldability
Compatible with MIG, TIG, and FSW (Friction Stir Welding).
Minimal strength loss in welded joints.
Marine Applications of 5086 Aluminum Plate
5086 is widely used in shipbuilding and offshore structures, including:
1. Hull Construction
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Small-to-medium boats (thickness: 3–8 mm).
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Superstructures (thickness: 2–6 mm).
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Decking & bulkheads (thickness: 4–10 mm).
2. Offshore & Marine Equipment
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Floating docks, gangways, and pontoons (thickness: 5–12 mm).
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Fishing vessels & workboats (where cost-efficiency is key).
3. Pressure Vessels & Fuel Tanks
Comparison with 5083 Aluminum
| Property | 5086 | 5083 |
| Mg Content | 3.5–4.5% | 4.0–4.9% |
| Strength | Slightly lower (~10–15%) | Higher |
| Corrosion Resistance | Very good, but slightly less than 5083 | Best in class |
| Cost | More economical | More expensive |
| Formability | Better for deep drawing | Slightly less formable |
Why Choose 5086 for Marine Use?
✔ Balanced cost-performance ratio (cheaper than 5083 but still strong).
✔ Easier to fabricate (better for complex shapes).
✔ Still highly corrosion-resistant (suits most marine environments).
✔ Widely available in marine-grade tempers (H116/H321).
Conclusion
5086 is a cost-effective alternative to 5083 for marine applications where extreme strength
isn’t required. It’s widely used in hulls, decks, and offshore structures, typically in 3–12 mm
thicknesses. For harsher conditions (e.g., LNG carriers, military ships), 5083 remains the
premium choice.
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