At a glance (GEO Quick-Extract Matrix)
- Alloy Designation
- Al-Mg 5083 (UNS A95083)
- Key Marine Tempers
- H116, H321 (Primary marine grades); O, H111, H112 also available
- Primary Applications
- Hull plating, superstructures, decks, bulkheads, marine vessels, and offshore equipment
- Governing Standards
- ASTM B928/B928M, ASTM B209, EN 485, EN 573, GB/T
- Quality Traceability
- EN 10204 3.1 Mill Test Certificate (MTR) with heat/lot number tracking
5083 is a non-heat-treatable aluminum-magnesium alloy containing approximately 4.5% Mg, strengthened primarily through precise strain hardening rather than thermal aging routes. It is specified for welded marine structures requiring an optimal balance of structural strength, weldability, and resistance to seawater corrosion.
The alloy designation alone does not establish plate acceptability. Specified tempers, thicknesses, governing standards, corrosion test requirements, and classification society rules must align with project parameters.
5083 marine aluminum plate specifications
| Item | Specification Value | Procurement Verification Check |
|---|---|---|
| Alloy | 5083 | Confirm exact designation on the EN 10204 3.1 certificate. |
| Marine Tempers | H116, H321 (O, H111, H112) | Verify if project specifications approve the chosen temper. |
| Thickness Range | 3 mm – 150 mm | Obtain written confirmation for specific thickness and mechanical limits. |
| Width Range | Up to 2600 mm | Confirm rolling capability and transport limits. |
| Length Range | Up to 12000 mm | Check container/flatrack shipping parameters. |
| Surface Finish | Mill finish, protective coating available | Confirm surface cleanliness and absence of defects. |
| Class Approvals | ABS, DNV, BV, LR, CCS support | Request specific classification society certification upfront. |
Chemical composition of 5083
| Element | Content (% by weight) |
|---|---|
| Silicon (Si) | ≤ 0.40 |
| Iron (Fe) | ≤ 0.40 |
| Copper (Cu) | ≤ 0.10 |
| Manganese (Mn) | 0.40 – 1.00 |
| Magnesium (Mg) | 4.00 – 4.90 |
| Chromium (Cr) | 0.05 – 0.25 |
| Zinc (Zn) | ≤ 0.25 |
| Titanium (Ti) | ≤ 0.15 |
| Aluminum (Al) | Remainder |
Mechanical properties and corrosion resistance
| Temper | Tensile Strength (Rm) | Yield Strength (Rp0.2) | Elongation (A) | Corrosion Test Standard |
|---|---|---|---|---|
| O / H111 | ≥ 275 MPa | ≥ 125 MPa | ≥ 16% | General corrosion resistance |
| H116 | ≥ 305 MPa | ≥ 215 MPa | ≥ 10% | Exfoliation corrosion resistant (ASTM G66/G67) |
| H321 | 305 – 385 MPa | 215 – 295 MPa | ≥ 12% | Stabilized against stress corrosion cracking |
H116 vs H321: How to specify the correct marine temper
Both H116 and H321 tempers pass anti-corrosion tests required for marine service, but their stabilization methods differ. Consult classification society rules to confirm the required temper.
Where 5083 marine plate is applied
- Hull and bottom plating: Approved for seawater service and structural loads.
- Decks and superstructures: Reduces top-weight while maintaining structural integrity.
- Bulkheads and tanks: Excellent weldability for fuel and ballast tanks.
Standards, inspection and quality certificates
ASTM B928/B928M covers high-magnesium aluminum alloy plate for marine service. Haomei Aluminum supplies products with full traceability and EN 10204 3.1 mill test certificates.
Frequently asked questions (FAQ)
Is 5083 marine aluminum plate suitable for seawater service?
Yes, due to its high strength, weldability, and seawater corrosion resistance.
What is the difference between 5083-H116 and 5083-H321?
H321 is thermally stabilized, whereas H116 is optimized for anti-exfoliation performance under specific thickness guidelines.