5083-H116 Marine Aluminum Plate

5083-H116 is the strongest non-heat-treatable marine aluminum alloy, certified by DNV-GL, Bureau Veritas, ABS, and Lloyd's Register for shipbuilding, offshore platforms, and pressure vessels. Thickness 6-200mm, width up to 3000mm.

Temper: H116 / H321 / O Thickness: 6 - 200mm Cert: DNV / BV / ABS
Get Quote Download Marine Cert
Product Overview

Overview

5083 is the strongest non-heat-treatable aluminum alloy in common use, specifically engineered for demanding marine and offshore environments. With a magnesium content of 4.0-4.9% and manganese additions up to 1.0%, it achieves tensile strengths exceeding 300 MPa in the H116 temper while maintaining excellent corrosion resistance in seawater and marine atmospheres.

The H116 temper designation is specifically optimized for resistance to exfoliation corrosion and stress corrosion cracking, making it the preferred choice for hull plating, superstructures, and other components that are continuously exposed to saltwater. This temper meets the stringent requirements of ASTM B928 for high-magnesium alloy plate for marine service.

Our 5083-H116 marine plate is certified by all major classification societies including DNV-GL, Bureau Veritas, ABS, and Lloyd's Register. Each plate ships with a full mill test certificate and marine classification certificate, ensuring complete traceability from melt to delivery. It is readily weldable using 5183 or 5356 filler alloys, and the heat-affected zone retains excellent corrosion properties after welding.

Alloy Data

Chemical Composition

Per ASTM B928 / EN 573-3 standard. Chemical limits for alloy 5083.

Element Si Fe Cu Mn Mg Cr Zn Ti Al
Max % 0.40 0.40 0.10 0.40 - 1.0 4.0 - 4.9 0.05 - 0.25 0.25 0.15 Balance
Performance Data

Mechanical Properties

Minimum guaranteed values per ASTM B928 for plate thickness 6-80mm.

Temper Tensile Strength (MPa) Yield Strength (MPa) Elongation (%)
O (Annealed) 275 - 350 125 16
H116 303+ 215+ 10
H321 303+ 215+ 10
Quality Assurance

Marine Certifications

Our 5083-H116 plate is certified by all major international marine classification societies.

DNV-GL

Det Norske Veritas-Germanischer Lloyd certification for marine and offshore materials. Meets rules for classification of ships.

Bureau Veritas

French classification society certification. Approved for hull structural steel and aluminum alloys per NR216 rules.

ABS

American Bureau of Shipping approval. Compliant with Rules for Materials and Welding for aluminum alloy construction.

Lloyd's Register

Lloyd's Register Group certification for marine aluminum alloys. Approved per Rules for the Manufacture of Materials.

What We Supply

Available Specifications

Custom sizes available. All marine grade plate ships with full mill test certificate and classification certificate.

Parameter Range Notes
Thickness 6 - 200 mm Ultrasonic tested per ASTM B548
Width Up to 3000 mm Standard widths: 1500, 2000, 2500, 3000mm
Length Up to 12000 mm Custom cut-to-length available
Tempers O / H116 / H321 H116 standard for marine applications
Standards ASTM B928, EN 485 Marine classification certificates included
Where It's Used

Applications

5083-H116 marine plate serves the most demanding marine and industrial environments worldwide.

5083 marine aluminum plate
5083 plate for hull and offshore structures
Plate processing line
Plate processing and inspection workflow
Marine aluminum plate project material
Marine project material supply
⚓

Hull Plating

Primary hull structure for commercial vessels, yachts, ferries, and patrol boats. Excellent seawater corrosion resistance and weldability.

🌊

Offshore Platforms

Helidecks, walkways, structural components, and living quarters for offshore oil & gas platforms and wind farm foundations.

⛽

LNG Tanks

Cryogenic storage and transport tanks for liquefied natural gas. 5083 retains excellent toughness at temperatures down to -196 C.

⛩

Naval Vessels

Military patrol craft, minesweepers, and fast attack craft. Lightweight construction reduces fuel consumption and increases speed.

Common Questions

FAQ

Both H116 and H321 tempers meet the same minimum mechanical property requirements (303 MPa tensile, 215 MPa yield). The key difference is in processing: H116 achieves its properties primarily through strain hardening with limited thermal stabilization, while H321 uses strain hardening followed by a low-temperature stabilization treatment. Both must pass the ASTM G66 (ASSET) and ASTM G67 (NAMLT) tests for exfoliation and intergranular corrosion resistance. In practice, H116 is more commonly specified for new-build vessels, while H321 is equally acceptable per all major classification societies.
We provide certificates from DNV-GL, Bureau Veritas (BV), American Bureau of Shipping (ABS), and Lloyd's Register (LR). Each certificate confirms the alloy composition, mechanical properties, and results of corrosion testing (ASSET/NAMLT). Certificates are issued per plate or per lot, ensuring full traceability from melt number through to the delivered product. If your project requires dual or multi-class certification, we can arrange this at the time of order. Certificate originals are shipped with the material; copies can be provided digitally before shipment.
Yes, 5083-H116 is highly weldable and is specifically designed to retain its corrosion resistance after welding. Use 5183 or 5356 filler alloys for MIG and TIG welding. The heat-affected zone (HAZ) will revert to approximately O-temper strength levels (around 275 MPa tensile), which is accounted for in marine structural design codes. Importantly, the HAZ maintains its excellent exfoliation and intergranular corrosion resistance, which is the critical property for marine service. Post-weld heat treatment is not required and is generally not recommended as it can sensitize the microstructure.
We supply 5083-H116 marine plate in thicknesses from 6mm up to 200mm. Standard stock thicknesses include 6, 8, 10, 12, 15, 20, 25, 30, 40, 50, 60, 80, and 100mm. Thicker plates (100-200mm) are produced on a made-to-order basis with typical lead times of 30-45 days. For plates above 80mm thickness, mechanical properties are tested at mid-thickness per classification society requirements. Maximum width is 3000mm and maximum length is 12000mm, though combinations of maximum thickness and maximum width/length may not be available. Contact us with your specific requirements.
5083 is preferred for shipbuilding for several critical reasons. First, it is the strongest commonly available non-heat-treatable alloy (303+ MPa tensile in H116), allowing thinner plate to be used and reducing vessel weight. Second, the H116 temper is specifically designed and tested for resistance to exfoliation corrosion, a failure mode unique to marine environments. Third, 5083 maintains excellent toughness at low temperatures, important for vessels operating in cold waters. While 5052 has good corrosion resistance, its strength is approximately 30% lower, meaning heavier construction. 6061-T6, though stronger, is a heat-treatable alloy that loses its temper in the weld HAZ and does not have the same level of exfoliation corrosion resistance. Additionally, 5083-H116 is the only alloy in this comparison that is universally approved by all major marine classification societies for hull structural use.