At sea, vessels must not only withstand powerful waves but also endure continuous exposure to high salinity and humidity, which cause long-term corrosive damage. For modern shipbuilding, selecting a material that combines high strength, corrosion resistance, and reduced welding requirements is essential to extending service life and improving operational efficiency.

Today, we proudly introduce a product that meets all these requirements: 5456 marine aluminum plate.

5456 H116 Marine Aluminum Plate

5456 aluminum alloy belongs to the Al-Mg 5xxx series anti-corrosion aluminum alloys. With a higher magnesium content, it delivers greater strength than conventional marine alloys such as 5083 and 5086, making it especially suitable for long-term service in high-salt, high-humidity, and high-stress marine environments.

The H116 temper is specifically developed for marine applications. Through controlled cold working and stabilization treatment, it maintains high mechanical strength while significantly reducing the risk of intergranular corrosion and exfoliation corrosion. It is a standard marine temper widely approved by international classification societies.

Why Choose Extra-Wide 5456 Aluminum Plate?

Traditional aluminum plates are limited in width, requiring extensive welding when building large hull sections. Our extra-wide plates (up to 2600 mm and above) offer clear advantages:

1. Reduced Welding Seams

Welds are often the weakest areas in a structure and the most vulnerable to stress corrosion. Fewer weld seams mean higher structural integrity and durability.

2. Lower Cost and Shorter Construction Time

Less welding directly reduces labor time, welding consumables, and overall construction cycles.

3. Superior Flatness and Appearance

Extra-wide plates minimize thermal deformation, resulting in smoother hull surfaces, improved hydrodynamics, and enhanced vessel aesthetics.

5456 Marine Aluminum Plate – Specifications

Mechanical Properties

Physical Properties

Key Advantages of 5456 H116 Marine Aluminum Plate

1. Outstanding Seawater Corrosion Resistance

5456 alloy exhibits exceptional resistance to seawater, salt spray, and industrial atmospheres. Even in welded zones and long-term immersion conditions, it maintains a stable microstructure, effectively preventing pitting, intergranular corrosion, and stress corrosion cracking.

2. Higher Structural Strength

Compared with standard 5xxx marine aluminum plates, 5456 H116 offers higher yield and tensile strength. It is ideal for primary hull structures, decks, side shells, and reinforced load-bearing areas, enabling stronger designs without increasing plate thickness.

3. Stable Weldability

5456 aluminum alloy features excellent weldability, with weld joint strength reaching ≥85% of the base metal. It shows no hot cracking tendency and is fully compatible with MIG and TIG welding processes commonly used in shipbuilding.

4. Good Formability and Machinability

Despite its high strength, 5456 H116 maintains good ductility, making it suitable for cold bending, roll forming, and localized forming processes required for complex hull geometries.

5. Long-Term Cost Efficiency

Although the initial material cost may be slightly higher, its long service life, reduced maintenance, and lower repair frequency result in lower total lifecycle cost.

6. Environmental Sustainability

Aluminum alloys are fully recyclable, aligning with the green and sustainable development goals of the modern marine industry.

Typical Applications

1. Hull Plating and Bottom Structures

These components are in direct contact with seawater and suffer the most severe corrosion. 5456 H116 provides long-term protection while enabling complex curved shapes through excellent formability.

2. Primary Structural Components

Including bulkheads, ribs, and keels. The high strength of 5456 H116 ensures structural safety, while its lightweight nature helps optimize vessel stability and center of gravity.

3. Decks and Side Shells

Decks endure dynamic loads and continuous exposure to marine atmospheres. The corrosion resistance and fatigue performance of 5456 H116 make it an ideal choice. For anti-slip requirements, tread plate options are also available.

4. Cargo Tanks and Pressure Vessels

In chemical carriers and LNG vessels, 5456 H116 can be used for cargo tanks. Recent breakthroughs in extra-wide and extra-long aluminum plates have provided critical material support for the localization of large LNG carriers.

About MC Aluminum

MC Aluminum is a professional marine aluminum plate manufacturer, supplying 5xxx and 6xxx series marine aluminum plates with thicknesses from 3.0 mm to 50 mm, widths up to 3100 mm and above, and customized lengths upon request.

All products comply with international classification society standards, including LR, and have passed marine corrosion resistance and mechanical performance certifications. Our products are exported to more than 40 countries and regions worldwide. We offer sample testing, direct factory supply, and competitive pricing.