5083 H116/H321 Marine Aluminum Plate

What are 5083 H116 and H321 Marine Aluminum Plate?

5083 H116 and H321 marine aluminum plate are highly corrosion-resistant structural alloys engineered specifically for shipbuilding and offshore environments. Characterized by its high magnesium content (4.0%–4.9%), this alloy offers exceptional strength after welding and resists stress corrosion cracking in seawater.

At GNEE, we supply 5083 marine aluminum plates fully certified by KR (Korean Register of Shipping). This certification guarantees that the material meets the strict safety and structural integrity standards required for commercial vessels, naval ships, and offshore rigs. Our current stock includes 4T, 5T, 6T, and 8T thicknesses with standard dimensions of 2000×8000 mm, ready for immediate dispatch.

Why Choose 5083 H116 vs. H321 Aluminum Plate?

Understanding the temper is critical for marine engineering. Aluminum alloys with more than 3.0% magnesium are susceptible to intergranular corrosion if exposed to elevated temperatures over time. The H116 and H321 tempers are specifically developed to solve this metallurgical issue.

• 5083-H116 Temper: This temper is strain-hardened and features a specific microstructure optimized to prevent exfoliation corrosion. It is widely specified for continuous contact with harsh seawater.
• 5083-H321 Temper: This temper undergoes strain hardening followed by low-temperature thermal stabilization. It ensures that the magnesium precipitates are evenly distributed, stabilizing the mechanical properties and preventing stress corrosion cracking (SCC) over the vessel's lifespan.

Both tempers pass the rigorous ASTM G66 (ASSET) and ASTM G67 (NAMLT) corrosion tests, making them the industry standard for welded aluminum ship hulls.

Standard Specifications of 5083 Marine Grade Aluminum Plate

We maintain an inventory of approximately 100MT of KR-certified marine plates to support urgent shipyard schedules. Below are the exact specifications available from GNEE:

Chemical Composition (Wt%) of 5083 H116/H321 Aluminum Alloy Plate

The performance of the 5083 aluminum ship plate heavily relies on its chemical makeup. Magnesium provides the core strength, while Manganese helps control the grain structure, enhancing fracture toughness.

Mechanical Properties of 5083 Marine Aluminum Sheet

When designing ship structures, the yield strength and welding performance are primary concerns. 5083 H116 and H321 maintain close to 100% of their joint efficiency after welding with 5183 or 5356 filler wires.

(Note: The mechanical properties strictly comply with KR classification rules for aluminum alloys.)

Physical Properties of KR Certified 5083 Aluminum Ship Plate

For naval architects calculating buoyancy and thermal loads, the physical properties of the 5083 series provide significant weight-saving advantages over traditional marine steel.

Technical Advantages of 5083 H116/H321 Shipbuilding Aluminum Plate

• Superior Corrosion Resistance: Specifically engineered to resist seawater, salt spray, and marine atmospheric corrosion without the need for protective coatings.
• High Strength-to-Weight Ratio: With a density roughly one-third that of marine steel, it reduces hull weight, increasing vessel payload capacity and fuel efficiency.
• Excellent Weldability: Compatible with MIG and TIG welding techniques. The Heat Affected Zone (HAZ) retains excellent strength compared to other 5xxx or 6xxx series alloys.
• KR Certified Quality: Every plate is inspected and approved by the Korean Register, ensuring full traceability and compliance with global maritime safety standards.
• Fatigue Resistance: Excellent resistance to vibration and wave impact fatigue, essential for high-speed ferries and patrol boats.

Typical Applications for 5083 Marine Grade Aluminum Sheet

Due to its robust performance profile, the KR certified 5083 aluminum plate is the material of choice for:

• Hulls, decks, and superstructures of fast ferries, yachts, and patrol boats.
• LNG carrier structures and pressure vessels (maintains high toughness at cryogenic temperatures).
• Offshore oil and gas platform helidecks and living quarters.
• Heavy-duty marine transportation equipment and floating structures.

As a professional marine grade aluminum supplier, GNEE implements a strict quality control system from ingot casting to final container loading. We ensure every piece of 5083 aluminum ship plate arrives at your shipyard in pristine condition and passes all class surveys without issue.

1. 100% Traceability and Certification
Shipyards require rigorous documentation for vessel registration. We provide complete transparency:
EN10204 3.2 MTC: Every batch is accompanied by a Mill Test Certificate (MTC) Type 3.2, strictly endorsed and stamped by a third-party Korean Register (KR) surveyor.
Plate Marking: Each aluminum plate is hard-stamped and inkjet-printed with the alloy grade (5083), temper (H116/H321), thickness, dimension, heat number, and lot number. This ensures 100% traceability back to the raw aluminum ingot.

2. Comprehensive Laboratory and Factory Testing
Before any KR certified aluminum plate leaves our facility, it undergoes rigorous metallurgical and physical inspections:

• Ultrasonic Testing (UT): 100% UT inspected to guarantee there are no internal defects, porosity, or delamination, which is critical for structural integrity.
• Corrosion Resistance Testing: We perform ASTM G66 (NAMLT) and ASTM G67 (ASSET) testing on the H116 and H321 tempers to verify their resistance to intergranular and exfoliation corrosion.
• Mechanical Testing: Tensile strength, yield strength, and elongation tests are conducted in our ISO-certified lab to ensure compliance with KR classification rules.
• Surface & Dimensional Check: Strict tolerances on thickness and flatness. The plate surface is inspected to be clean, mill-finished, and free from oil stains, deep scratches, or oxidation spots.

3. Seaworthy Export Packaging for 8-Meter Plates
Shipping a 2000×8000 mm aluminum plate requires specialized handling to prevent bending, scratching, or salt-moisture corrosion during long-haul ocean freight. Our standard export packaging includes:

• Moisture Protection: The plates are interleaved with anti-static craft paper or PE film to prevent surface friction. The entire bundle is then wrapped in thick waterproof plastic sheeting with desiccants placed inside to prevent condensation.
• Heavy-Duty Palletizing: Because of the 8-meter length, we use custom-built heavy-duty wooden fumigated pallets or reinforced steel skids. This prevents sagging or deformation during crane lifting.
• Secure Lashing: The bundles are reinforced with edge protectors and tightly bound with heavy-duty galvanized steel straps.

4. Pre-Shipment Inspection (PDI) and Loading

• Final Visual Check: Before loading, our QA team conducts a final verification of the plate quantities, shipping marks, and packaging integrity.
• Loading Reports: We provide our clients with high-resolution photos and videos of the materials, packaging, and the container loading process.
• Container Suitability: For the 2000×8000 mm size, we safely lash the plates into Open Top (OT) containers or Flat Racks (FR), ensuring they remain completely immobile during rough sea conditions.

Get a Quote for KR Certified 5083 Marine Aluminum Plate

GNEE is a reliable supplier of marine-grade aluminum. We currently hold approximately 100MT of KR-certified 5083 H116/H321 aluminum plates in stock (4T, 5T, 6T, 8T at 2000×8000 mm). We offer competitive pricing, strict quality control, and global shipping capabilities.

Ready to secure materials for your next shipbuilding project?
Contact our technical sales team today with your required quantities and destination port. We will provide a detailed quotation and lead time within 24 hours.

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