High Strength Marine Grade Aluminum Plate 5083 H116 H321 1220x2440mm Custom Size

Our Marine Grade Aluminum Plate 5083 is manufactured from EN AW-5083 alloy (Al Mg4.5Mn0.7) in H116 and H321 tempers, specially developed for boat building and shipbuilding applications that demand high strength, reliable weldability and superior resistance to seawater corrosion.

The 5083 marine aluminum sheet offers an outstanding combination of high tensile strength, excellent formability and natural immunity to marine atmosphere and salt water attack. It keeps stable mechanical properties after welding, which is the key reason it is widely selected for hulls, decks, bulkheads and marine structures.

We supply boat building aluminum sheet and plate with thickness from 4mm to 80mm, width up to 2500mm and length up to 12000mm. Standard 1220 x 2440mm (4 x 8 ft) sheets are kept in stock, and custom size aluminum sheet can be cut to your exact drawings. Every batch is tested for chemical composition, mechanical properties and surface quality before shipment, with mill test certificates provided.

• Product Name: Marine Grade Aluminum Plate 5083
• Alloy: 5083 (EN AW-5083, Al Mg4.5Mn0.7)
• Temper: H116, H321
• Thickness: 4mm - 80mm, custom sizes available
• Width: 1000mm - 2500mm
• Length: 2000mm - 12000mm, custom cutting available
• Marine Grade: excellent resistance to seawater and marine atmosphere
• Boat Building: weldable and crack resistant for hull fabrication
• High Strength: superior tensile and yield strength for structural use
• High Strength Aluminum: high tensile and yield strength for load-bearing marine structures
• Standard Size: 1220 x 2440 mm (4 x 8 ft) sheets in stock
• Custom Size: laser cutting and shearing to required dimensions
• Stable After Welding: mechanical properties maintained in H116/H321 tempers
• Surface: mill finish, smooth, flat, free from scratches and oxidation
• Standard: ASTM B209, EN 485-2, GB/T 3880
• Certification: ISO 9001:2015, ASTM B209, SGS
• Extra Service: free samples, custom cutting, laser cutting and bending

• Boat hulls, decks and superstructures
• Shipbuilding and vessel repair
• Yacht and speedboat construction
• Dock, pier and harbor structures
• Offshore platforms and marine equipment
• LNG tankers, pressure vessels and storage tanks
• Transport vehicles and structural fabrication

We support full customization of alloy, temper, thickness, width, length and cutting tolerance. Common stock sizes such as 4mm, 6mm and 8mm plates can be cut to your required dimensions with laser cutting, shearing or sawing.

Custom surface treatments, edge deburring, drilling and bending are available on request. OEM packaging with your logo and shipping marks can also be arranged for repeated orders.

Our technical team provides professional guidance on marine alloy selection, temper choice and size planning for boat building projects. Mill test certificates, material certificates and third-party inspection reports are supplied to support factory audit and customs clearance.

Strict full-batch quality control guarantees stable chemical composition, mechanical properties and dimensional accuracy. Our after-sales team responds quickly and offers long-term technical consultation.

Each bundle of marine grade aluminum plate is protected with moisture-proof paper and PE film, then packed onto seaworthy export wooden pallets or steel-framed crates with edge protectors.

Reinforced packing prevents scratches, surface oxidation and edge damage during long ocean transportation. Clear shipping marks and complete cargo documents are provided for smooth customs clearance.

We cooperate with trusted logistics providers and support sea shipment to global destinations with a lead time of 7-20 working days.

Q1: What makes 5083 a reliable marine grade aluminum for boat building?
5083 combines high strength, excellent seawater corrosion resistance and stable weldability. In H116 and H321 marine tempers it resists sensitization and keeps mechanical properties after welding, making it a trusted choice for hulls, decks and ship structures.

Q2: What advantages does your marine grade aluminum plate offer over ordinary aluminum sheets?
Every plate is produced with strict alloy control, true marine tempers (H116 / H321), ASTM B209 dimensional tolerance and a smooth, defect-free mill finish. Chemical composition and mechanical properties are verified batch by batch before shipment.

Q3: What are your factory advantages as a marine aluminum plate supplier?
We operate integrated production lines with a supply ability of 5000 tons per month, a low 2-ton MOQ and direct factory pricing. ISO 9001:2015 certified management ensures stable quality from casting to final inspection.

Q4: Can you provide mill test certificates and support third-party inspection?
Yes. A mill test certificate covering chemical composition and mechanical properties is supplied with every shipment, and third-party inspection such as SGS can be arranged before loading.

Q5: Do you keep stock for quick delivery?
Yes. Standard 1220 x 2440 mm sheets as well as 4mm, 5mm, 6mm, 8mm and 10mm plates are kept in stock, with a standard lead time of 7-20 working days. Urgent orders can be prioritized after confirmation.

Q6: What customization services does your factory provide?
We customize temper, thickness, width and length, and offer laser cutting, shearing, drilling, bending and edge deburring. OEM packaging with your logo and shipping marks is also available for regular orders.

Q7: Can I get samples to test weldability and corrosion resistance?
Yes, free samples are available for evaluation; the customer only pays the freight. You are welcome to run welding and salt-spray tests before placing a mass order.

Q8: How do you control quality from production to delivery?
We run full-process control covering composition analysis, mechanical testing, flatness and surface inspection, followed by seaworthy packing. Our after-sales team provides fast responses and long-term technical consultation.