Haomei Aluminum supplies 5456 aluminum plate in marine-grade tempers, with material inspection, mill test certificates (MTC) and project documentation available according to customer requirements. For marine projects, third-party or classification-society certification can also be arranged when specified, including ABS, DNV, BV, LR and CCS requirements. Our 5456 plate can be produced to applicable ASTM B928 and ASTM B209 requirements for marine and structural applications.
- Series 5xxx / Al-Mg
- Product Forms Sheet / Plate
- Tempers H116 / H321
- Supply Stock / Custom Cut
Need a corrosion-resistant and weldable marine plate? Haomei Aluminum can help match 5456 alloy temper, thickness, width, inspection requirements, and delivery conditions to your vessel, offshore, or structural project.
What Is 5456 Marine Aluminum Plate?
5456 is a high-magnesium wrought aluminum alloy in the 5xxx series. It is selected for structural applications that call for a useful combination of strength, corrosion resistance and welded fabrication.
In marine projects, choosing the alloy alone is not enough. The final material specification normally combines alloy, temper, thickness, dimensions, applicable standard and inspection requirements.
The alloy is identified as AA 5456 and UNS A95456. It belongs to the wrought aluminum-magnesium family and is supplied in rolled sheet and plate forms rather than as a cast product.
5456 Marine Aluminum Plate Specifications
| Alloy | 5456 |
| Aluminum Association Designation | AA 5456 |
| UNS | A95456 |
| Alloy Family | 5xxx Series / Aluminum-Magnesium |
| Product Form | Sheet / Plate / Cut-to-Size Plate |
| Marine Tempers | H116 / H321, subject to applicable specification |
| Surface | Mill Finish |
| Standard | ASTM B928/B928M and other applicable product specifications as agreed |
| Thickness | According to required product dimensions, manufacturing capability and applicable standard |
| Width | Custom width available according to production capability and order specification |
| Length | Stock or cut-to-length according to order requirements |
| Inspection | Mechanical, dimensional, surface and other inspection according to the agreed specification |
| Documentation | Mill Test Certificate and agreed quality documents |
Why Choose 5456 Marine Aluminum Plate?
5456 is an aluminum-magnesium alloy containing a relatively high magnesium level. It was developed for applications where lightweight construction must be combined with resistance to saltwater exposure and welded structural strength.
Compared with many conventional aluminum plate grades, 5456 offers a useful balance of:
- High Strength: Stronger than many common non-heat-treatable 5xxx aluminum alloys.
- Corrosion Resistance: Resists seawater, salt spray, humidity, and marine atmospheric conditions.
- Weldability: Suitable for welded panels, frames, hull structures, and fabricated marine components.
- Lightweight Construction: Helps reduce vessel weight and improve payload efficiency.
- Good Toughness: Suitable for transportation and specialized defense-related structures.
- Cold Workability: Can be formed in appropriate tempers for fabricated parts.
5456 Marine Aluminum Plate Chemical Composition
| Element | Typical Specification Range (%) |
| Magnesium (Mg) | 4.7 – 5.5 |
| Manganese (Mn) | 0.5 – 1.0 |
| Chromium (Cr) | 0.05 – 0.20 |
| Iron (Fe) | ≤ 0.40 |
| Silicon (Si) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.10 |
| Zinc (Zn) | ≤ 0.25 |
| Titanium (Ti) | ≤ 0.20 |
| Aluminum (Al) | Balance |
Mechanical Properties of 5456 Aluminum Plate
| Alloy | Temper | Tensile Strength Rm (MPa) | Yield Strength Rp0.2 (MPa) | Elongation A (%) |
| 5456 | O / H111 | 285–360 | 125–205 | ≥16 |
| H112 | ≥290 | ≥130 | ≥12 | |
| H116 / H321 | 315–405 | 230–315 | ≥12 |
5456 Aluminum Plate: H116 and H321 Tempers
H116 and H321 are two commonly requested tempers, each selected according to the required corrosion resistance, strength level and fabrication needs.
5456 H116 Aluminum Plate
5456 H116 aluminum plate is commonly used in marine environments where resistance to seawater corrosion is a primary requirement. It is frequently specified for hull structures, decks, bulkheads, offshore components and other welded marine fabrications.
The H116 temper is generally selected for high-magnesium alloy plate intended for demanding saltwater service. Final requirements should be verified against the relevant project specification, classification society rules or purchase standard.
5456 H321 Aluminum Plate
5456 H321 aluminum plate is supplied in a strain-hardened and stabilized temper designed for structural applications requiring a practical balance of strength, formability and corrosion resistance.
This temper is often considered for welded structures, transportation equipment, marine components and industrial fabrications where the material must meet defined mechanical-property and dimensional tolerances.
Need a quote for 5456 aluminum plate? Please provide the requested temper (H116 or H321), plate size, thickness, quantity, destination, applicable standard and any testing or certification requirements.
Common Applications of 5456 Marine Aluminum Plate
Shipbuilding and Marine Structures
5456 aluminum plate is suitable for lightweight, corrosion-resistant vessel components, including:
- Hull bottom plates
- Side shell plating
- Decks and superstructures
- Bulkheads and partitions
- Engine room structures
- Marine gangways
- Fast ferry structures
- Yacht components
- Workboats and patrol vessels
Offshore and Coastal Equipment
The alloy can also be used in equipment exposed to salt spray, humidity, and marine atmospheres:
- Offshore platforms
- Marine access systems
- Coastal structural components
- Dock and port equipment
- Marine transportation containers
Defense and Heavy Transportation
Due to its strength-to-weight ratio and toughness, 5456 aluminum plate may be used in specialized transportation and defense-related structures, subject to the relevant project specifications.
- Military vehicle components
- Naval structures
- Protective structural panels
- Heavy-duty transport equipment
5456 vs 5083 vs 5086 Marine Aluminum
These 5xxx-series alloys can all appear in marine projects, but the right choice depends on the required temper, thickness, structural properties, corrosion requirements and applicable specification.
| Selection Factor | 5456 | 5083 | 5086 |
| Alloy Family | 5xxx / Al-Mg | 5xxx / Al-Mg | 5xxx / Al-Mg |
| Marine Use | Strength-focused marine structural applications | Broad marine structural and fabrication applications | Marine structural and fabricated components |
| Magnesium Level | High | High | High |
| Corrosion Performance | Very good in suitable marine conditions | Very good | Very good |
| Weldability | Good for welded aluminum fabrication | Good | Good |
| Typical Selection Logic | When higher structural strength is important | Versatile marine fabrication | Marine structures requiring a balance of strength and corrosion resistance |
Haomei 5456 Marine Aluminum Plate Quality Control
Raw Material & Melt Control
Material input and melt chemistry are controlled against the required alloy specification.
Alloy Composition Verification
Chemical composition is checked to confirm the ordered 5456 alloy requirement.
Rolling & Temper Control
Rolling and temper processing are controlled according to the required product condition.
Thickness Inspection
Plate thickness is checked against the required dimensional tolerance.
Width & Length Inspection
Product dimensions are inspected before release for packing.
Surface Inspection
Surface condition is checked for the agreed finish and visible quality requirements.
Mechanical Testing
Mechanical testing can be performed according to the applicable standard and purchase requirements.
MTC & Shipment Documents
Material certificates and agreed shipping documents are prepared for the completed order.
5456 Aluminum Plate Packaging and Export Delivery
Marine aluminum plate can be affected by handling, moisture, edge impact and movement during transportation. Haomei adjusts the packing method to the plate dimensions, weight, destination and unloading requirements.
- Moisture-resistant wrapping
- Surface protection
- Edge protection where required
- Reinforced steel strapping
- Wooden pallets or suitable export supports
- Protection against movement during loading
How to Order 5456 Marine Aluminum Plate
To receive an accurate quotation from Haomei Aluminum, please provide the following information:
- Alloy and temper: such as 5456 H116 or 5456 H321
- Plate dimensions: thickness × width × length
- Quantity: kilograms, metric tons, sheets, or project total
- Applicable standard: ASTM B928, ASTM B209, EN standard, or customer specification
- End application: hull plate, deck, defense structure, offshore component, etc.
- Testing requirements: MTC, UT, third-party inspection, corrosion test, classification documentation
- Delivery destination and trade terms: FOB, CIF, CFR, EXW, etc.
Our technical and sales team will recommend a suitable supply solution based on your application rather than simply quoting a generic plate grade.
Request a Quote for 5456 Marine Aluminum Plate
Tell us your temper, dimensions, quantity, standard, and destination for a tailored quotation.
Request a QuoteFAQ – 5456 Marine Aluminum Plate
Is 5456 aluminum suitable for seawater use?
Yes. 5456 is a high-magnesium 5xxx aluminum alloy with excellent resistance to seawater and marine atmospheric corrosion when properly selected, fabricated, and maintained.
What is the difference between 5456 and 5356 aluminum?
Although the designations are similar, their primary applications are different. 5456 is commonly supplied as structural wrought plate or sheet, while 5356 is widely used as an aluminum welding filler alloy.
Which temper is suitable for marine use?
H116 and H321 are commonly requested for marine applications because these tempers are associated with improved resistance to exfoliation corrosion and intergranular corrosion. The required temper should still be determined by the project specification.
Can 5456 aluminum plate be welded?
Yes. 5456 aluminum plate has good weldability and is suitable for welded marine structures. The welding method and filler alloy should be selected according to the engineering design and applicable welding procedure.
Does Haomei Aluminum provide customized 5456 plate sizes?
Yes. Haomei Aluminum can provide customized thickness, width, length, temper, packaging, and inspection options based on order requirements.
Is 5456 stronger than 5083 aluminum?
5456 can provide higher strength in certain specified tempers and thickness ranges, but aluminum alloys should not be ranked by alloy number alone. A valid comparison requires the same temper basis, thickness range, and applicable product standard.
What standard covers 5456 marine aluminum plate?
ASTM B928/B928M is the principal marine-service specification to review for high-magnesium aluminum-alloy sheet and plate. ASTM B209/B209M may also apply depending on the specific product and purchase requirements.