GNEE 5083 aluminum alloy belongs to the Al-Mg (5xxx series) system, with a magnesium content of 4.0–4.9% and small amounts of manganese and chromium. This alloy cannot be strengthened through heat treatment; instead, its higher strength is achieved primarily through strain hardening (cold working).
5083 is a globally recognized marine-grade aluminum alloy, widely applied in ship hulls, decks, cabins, and other critical components.
Key Advantages of 5083 Marine Aluminum Plates
Excellent seawater corrosion resistance: Significantly better than most steels and some 6xxx series aluminum alloys.
High strength: Superior to 5052 and 5754, suitable for high-load ship structures.
Good weldability: Maintains mechanical properties after welding.
Outstanding low-temperature toughness: Retains ductility even at -196°C.
Lightweight: Reduces vessel weight, improves speed, and lowers fuel consumption.
H116 vs. H321 Tempers – Tailored for Marine Environments
H116 Temper
Designed specifically for marine service, H116 undergoes controlled strain hardening and thermal processing to achieve high strength with excellent resistance to exfoliation corrosion, protecting hulls in direct seawater exposure.
H321 Temper
A slightly harder temper than H116, H321 undergoes strain hardening followed by low-temperature stabilization, providing high strength and superior stress corrosion cracking resistance. It is ideal for high-load areas such as decks and superstructures.
GNEE 5083 Marine Aluminum Plate – Specifications
| Feature | Specification |
|---|---|
| Temper | 5083 H321 / H116 |
| Thickness | 3 – 50 mm |
| Width | 1,000–2,600 mm |
| Length | 2,000 – 12,000 mm |
| Standard Sizes | 2000×6000 mm, 2000×8000 mm, 2000×9000 mm, 1500×3000 mm |
| Surface Finish | Mill finish, bright finish, polished |
| Protective Film | Blue PVC film or paper interleaving |
| Packaging | Standard airworthy packaging |
| MOQ | 1–3 tons |
Mechanical Properties of 5083 Marine Aluminum Plates
| Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 5083-H111 | 272 | 143 | 14 |
| 5083-H112 | 294 | 157 | 10 |
| 5083-H116 | 315 | 226 | 10 |
| 5083-H321 | 315 | 226 | 10 |
Applications of GNEE 5083 Marine Aluminum Plates
Ship Hull Structures:
Used in hull plating, decks, side shells, and bottom plates, all in constant seawater contact.
Internal Facilities:
Applied in consoles, engine bases, cable trays, and other onboard components. The lightweight nature of aluminum helps lower the vessel's center of gravity, improving stability.
Specialty Vessels:
Extensively used in yachts, cruise ships, grain carriers, fishing vessels, workboats, and dredgers.
Importance of Classification Society Certification
CCS (China Classification Society): China's official classification authority.
DNV (Det Norske Veritas): A Norway-based authority in offshore oil, gas, and renewable energy.
ABS (American Bureau of Shipping): Influential in offshore engineering and LNG carriers.
BV (Bureau Veritas): A France-based, globally recognized inspection and certification body.
LR (Lloyd's Register): A UK-based, one of the oldest and most prestigious classification societies.
Certification ensures that:
The alloy's chemical composition and mechanical properties meet marine standards.
The production process is controlled and quality is traceable.
Plates are ready for direct shipbuilding use without additional testing.
The material is globally accepted for export and international projects.
For shipbuilding or offshore applications, using GNEE 5083 H116 / H321 marine aluminum plates with approval from at least one major classification society (CCS, DNV, ABS, BV, or LR) is essential to guarantee compliance, reliability, and safety.
