Marine Grade 5083 H321 Aluminum Plate | LR BV ABS DNV Approved Shipbuilding Aluminum Sheet
5083 H321 aluminum plate is a marine grade aluminum alloy plate designed for shipbuilding, offshore structures and marine engineering applications requiring excellent seawater corrosion resistance, high strength and reliable welding performance.
Manufactured from aluminum alloy 5083, this non-heat-treatable Al-Mg alloy contains approximately 4.0%–4.9% magnesium, providing excellent mechanical strength and outstanding resistance to seawater and marine atmospheric corrosion.
5083 H321 aluminum plates are widely approved by major marine classification societies including:
- LR (Lloyd’s Register)
- DNV
- ABS
- BV
- CCS
- NK
We are a professional exporter, stockist and supplier of 5083 H321 marine aluminum plates in China, supplying shipbuilding aluminum sheets with LR, BV, ABS and DNV class approvals.
What is 5083 H321 Marine Grade Aluminum Plate?
5083 aluminum alloy belongs to the 5000 series aluminum-magnesium alloys and is known for:
- excellent seawater corrosion resistance
- high mechanical strength
- good weldability
- lightweight performance
5083-H321 aluminum is strain hardened and stabilized to achieve mechanical properties approximately one-quarter between annealed (O temper) and full-hard (H38 temper).
This temper provides:
- improved structural stability
- excellent fatigue resistance
- reliable marine performance
5083 H321 aluminum plate is widely used for:
- ship hull structures
- decks
- bottom plating
- marine containers
- LNG storage tanks
- offshore structures
Why is 5083 H321 Aluminum Used for Shipbuilding?
5083 marine aluminum alloy offers excellent performance in extreme marine environments.
Main Advantages
- outstanding seawater corrosion resistance
- high strength-to-weight ratio
- excellent weldability
- low maintenance cost
- long service life
- excellent resistance to industrial chemical environments
The corrosion rate of 5083 aluminum in seawater is extremely low, generally:
- 0.025 – 0.05 mm/year
This significantly reduces:
- maintenance requirements
- operational cost
- hull corrosion risk
5083 aluminum also retains excellent mechanical strength after welding, making it ideal for welded ship structures.
5083 H321 Aluminum Plate Specifications
| Specification | Details |
|---|---|
| Material Grade | Aluminum Alloy 5083 |
| Temper | H321 |
| Product Type | Marine Grade Aluminum Plate |
| Thickness Range | 3 mm – 50 mm |
| Width Range | 1000 mm – 2600 mm |
| Length Range | 2000 mm – 12000 mm |
| Standard Sizes | 2000×6000 mm / 2000×8000 mm / 1500×3000 mm |
| Surface Finish | Mill Finish / Bright / Polished |
| Standards | Marine Grade Aluminum Plate |
| Certificates | DNV / LR / ABS / BV / CCS / NK |
Custom dimensions are available upon request.
Chemical Composition of 5083 Marine Aluminum Plate
| Alloy | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti |
|---|---|---|---|---|---|---|---|---|
| 5083 | ≤0.40 | ≤0.40 | ≤0.10 | 0.40–1.00 | 4.00–4.90 | 0.05–0.25 | ≤0.25 | ≤0.15 |
The high magnesium content improves:
- marine corrosion resistance
- structural strength
- welding performance
Mechanical Properties of 5083 Aluminum Plate
| Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Certification |
|---|---|---|---|---|
| O / H111 / H112 | ≥275 | ≥125 | ≥16 | DNV / GL / ABS / CCS / BV / LR |
| H116 | ≥305 | ≥215 | ≥10 | Marine Approved |
| H321 | 305 – 385 | 215 – 295 | ≥12 | Marine Approved |
5083 H321 aluminum plate provides an excellent combination of:
- strength
- toughness
- corrosion resistance
- marine structural reliability
Corrosion Resistance of 5083 Marine Aluminum Plate
5083 aluminum alloy is highly resistant to:
- seawater corrosion
- marine atmosphere
- salt spray environments
- industrial chemical exposure
The alloy demonstrates:
- excellent intergranular corrosion resistance
- good exfoliation corrosion resistance
- long-term structural durability
These characteristics make 5083 H321 ideal for:
- ship hulls
- offshore platforms
- marine storage tanks
- coastal engineering structures
Weldability of 5083 H321 Aluminum Plate
5083 H321 aluminum plates provide excellent weldability using standard aluminum welding processes including:
- MIG welding
- TIG welding
The alloy maintains high mechanical strength after welding, making it suitable for:
- welded ship structures
- offshore fabrication
- marine structural components
Marine Classification Society Approvals
5083 H321 shipbuilding aluminum plates can be supplied with approvals from major marine classification societies including:
- DNV
- ABS
- LR
- BV
- CCS
- NK
Marine certificates ensure compliance with:
- shipbuilding standards
- offshore engineering requirements
- marine structural applications
Surface Finish Options
5083 H321 aluminum plates can be supplied with:
- mill finish
- polished finish
- bright finish
- customized surface treatment
Protective film coating is available upon request.
Applications of 5083 H321 Marine Aluminum Plate
5083 H321 aluminum plates are widely used in:
Shipbuilding Industry
- ship hull structures
- ship decks
- bottom plating
- ship side plates
- engine bases
Offshore Engineering
- offshore working platforms
- marine structural components
- offshore vessels
LNG and Cryogenic Applications
- LNG spherical storage tanks
- cryogenic storage systems
High-Speed Marine Vessels
- ferries
- hydrofoils
- yachts
- cruise ships
The lightweight performance of aluminum alloy 5083 helps improve:
- fuel efficiency
- payload capacity
- vessel speed
5083 H321 vs 5083 H116 Aluminum Plate
| Property | 5083 H321 | 5083 H116 |
|---|---|---|
| Temper Process | Strain Hardened & Stabilized | Marine Hardened |
| Corrosion Resistance | Excellent | Excellent |
| Marine Application | Structural Shipbuilding | Marine Hull Structures |
| Strength | High | Slightly Higher |
Both tempers are widely used for marine applications depending on project requirements.
Testing and Inspection
5083 H321 aluminum plates can be supplied with:
- ultrasonic testing (UT)
- dimensional inspection
- mechanical testing
- chemical analysis
- corrosion testing
- surface inspection
Third-party inspection is available upon request.
Related Products
Marine Grade Aluminum Plates
- 5086 Aluminum Plate
- 5052 Aluminum Sheet
- 5456 Marine Aluminum Plate
Offshore Engineering Materials
- Aluminum Checker Plate
- Marine Aluminum Flat Bar
- Aluminum Extrusions for Shipbuilding
Aluminuam 5083 H321 Plate
Our 5083 H321 marine grade aluminum plates are manufactured for reliable performance in shipbuilding and offshore engineering applications.
