In the commercial shipbuilding and naval defense industries, engineers are constantly looking for ways to reduce vessel weight without compromising structural integrity. For high-speed ferries, patrol boats, and luxury yachts, heavy steel hulls limit speed and consume too much fuel. This is where low-density aluminum alloy structures become essential.
Among all marine-grade alloys, the 5083 H116 marine grade aluminum stands out. It offers high tensile strength, exceptional corrosion resistance, and verified reliability in harsh seawater environments.
At GNEE, we supply certified aluminum plates that help shipbuilders increase vessel speed, lower fuel consumption, and extend the operational lifespan of the ship. But what exactly makes the 5083-H116 temper the industry standard? Let's break down the technical advantages.
1. Superior Welding Performance for 5083-H116 Aluminum Plates
In shipbuilding, assembling the hull requires hundreds of meters of structural welding. A major problem with many high-strength alloys is that the heat from welding destroys their mechanical properties, and this lost strength cannot be restored by post-weld heat treatments.
The 5083-H116 aluminum plate is designed to solve this. It has excellent resistance to weld cracking. More importantly, it retains exceptional joint strength in the Heat-Affected Zone (HAZ) after welding. When using the correct filler wires, such as ER5183 or ER5356, the welded joints perform reliably under the heavy stress of ocean waves. This high weldability speeds up the shipyard construction process and ensures hull safety.
2. Outstanding Resistance to Seawater Corrosion
Constant exposure to saltwater, sea spray, and marine atmosphere will quickly degrade standard metals. Aluminum 5083 inherently forms a dense, continuous oxide film when exposed to air, which acts as a barrier against seawater erosion.
However, what makes the "H116" temper special is its specific resistance to exfoliation corrosion (flaking) and intergranular corrosion. Standard tempers might fail under the ASTM G66 (ASSET) test over time, but the marine grade aluminum 5083 H116 is strain-hardened specifically to lock its grain structure, preventing saltwater from penetrating between the metal grains.
(Note: While surface treatments like anodizing can further improve surface wear resistance and appearance, 5083-H116 is structurally capable of resisting severe marine corrosion bare, without any coating.)
3. Excellent Cold and Hot Forming Properties
Ship hulls are not flat. Naval architects design vessels with complex curves for hydrodynamic efficiency. Therefore, marine aluminum plates must undergo severe cold bending and forming during shipyard processing.
A common pain point for fabricators is that high-strength plates often crack along the bend line. The 5083-H116 aluminum sheet offers excellent ductility relative to its yield strength. When fabricators respect the correct minimum bend radii guidelines, this alloy can be processed, rolled, and formed into complex hull shapes, bulkheads, and superstructures without developing stress fractures or cracking defects.
4. Lightweight Efficiency: Fuel Savings and Speed
With a density of roughly 2.66 g/cm³, the 5083-H116 aluminum plate is only about one-third the weight of marine steel. By replacing steel with this aluminum alloy, a vessel significantly reduces its draft (the depth it sits in the water). This leads to lower hydrodynamic resistance, allowing the ship to achieve higher top speeds with smaller engines. Alternatively, the saved weight can be converted into a higher payload capacity, making commercial shipping operations more profitable.
Chemical composition of 5083 aluminium plate
| Element | Composition % |
| Al | REM |
| Si | ≤0.4 |
| Cu | ≤0.10 |
| Mg | 4.0-4.9 |
| Zn | ≤0.25 |
| Mn | 0.40-1.0 |
| Ti | ≤0.15 |
| Cr | 0.05-0.25 |
| Fe | ≤0.40 |
| Note: Single≤0.05; Total≤0.15 | |
Mechanical properties of 5083 alloy aluminum plate
| Tensile strength (σb) | 110-136MPa |
| Yield strengthσ0.2 (MPa) | ≥110 |
| Elongationδ10 (%) | ≥20 |
| Elastic modulus (E) | 69.3～70.7Gpa |
| Annealing temperature | 415℃ |
Comparing Tempers: 5083-H116 vs H321 vs H112 aluminum plate
When you plan to buy aluminum 5083 H116 for shipbuilding, you will often see other tempers like H321 and H112. It is crucial to use the correct one to pass marine inspections:
- 5083-H116 aluminum plate: Strain-hardened specifically to meet the strict corrosion resistance requirements of marine environments. Tested against exfoliation. The primary choice for underwater hull sections.
- 5083-H321 aluminum plate: Strain-hardened and stabilized. It has nearly identical mechanical limits and corrosion resistance to H116. The choice between H116 and H321 usually depends on specific shipyard fabrication preferences or regional availability. Both are premium marine grades.
- 5083-H112 aluminum plate: Strain-hardened at elevated temperatures. While it has good formability, it does not undergo the specific thermal treatments required to guarantee resistance to seawater exfoliation. It should not be used for critical underwater hull construction.
Why Choose GNEE as Your 5083-H116 Aluminum Plate Supplier?
Sourcing heavy-duty marine aluminum requires a supplier that understands class society standards. If the metal fails inspection, the entire shipbuilding project stops. GNEE is a direct manufacturer and global supplier of premium marine aluminum.
- Verified Certifications: We supply DNV certified 5083 aluminum sheet, as well as approvals from ABS, LR, CCS, and BV upon request.
- Full Traceability: Every shipment includes an EN 10204 3.1 or 3.2 Mill Test Certificate (MTC), ensuring the chemical composition and mechanical tests meet your exact project specs.
- Custom Dimensions: From 3mm thin sheets for superstructures to 100mm+ thick plates for high-stress mounts, we cut to your specific length and width, reducing your scrap waste.
Are you looking for an accurate aluminum 5083 H116 price for your current vessel build? Do not let material delays slow down your shipyard.
Contact GNEE today. Send us your required thickness, dimensions, and total tonnage. Our marine metal specialists will provide a precise, no-obligation quote within 24 hours.
Bonus: Mention this article in your inquiry, and we will send you our free "2026 Marine Aluminum Processing Guide," complete with CAD-ready material property data sheets for your engineering team!
