Marine sheet metal are available in a variety of materials, among which marine aluminum sheet is the most common due to its light weight, excellent corrosion resistance, good strength and welding properties, and is widely used in ship structures and components, which can effectively enhance the performance and service life of ships.

Marine grade aluminum sheet metal are the most common among marine grade plates for the following reasons:

- Lightweight: Aluminum has a lower density, and compared to steel, aluminum can significantly reduce a ship's deadweight, thereby improving load carrying capacity and fuel efficiency.

- Corrosion resistance: Aluminum has good corrosion resistance, especially in the marine environment, and is not easy to rust and corrode, which can extend the service life of the ship and reduce maintenance costs.

- Strength and Rigidity: Although the density of aluminum is low, aluminum alloys (such as 5052, 5083, 5086, 6061, etc.) have excellent strength and rigidity, which are suitable for withstanding all kinds of stresses when the ship travels at sea.

- Machinability: Marine aluminum sheet is easy to machine and form, and complex hull structures can be easily fabricated through processes such as welding, cutting and punching.

- Environmentally friendly: Aluminum is a recyclable material that meets modern environmental requirements, and ships using aluminum are also better able to recycle and reuse it at the end of its life cycle.

- Thermal and electrical conductivity: Aluminum has better thermal and electrical conductivity, making it suitable for use in certain marine components that require heat exchange or electrical connections.

Commonly used marine grade aluminum sheet alloys include 5052, 5083, 5086, 6061, 6082 and 7075. Each of these aluminum alloys has its own characteristics and is suitable for different shipbuilding parts and working environments:

- Marine Aluminum Alloy 5083:

Characteristics: Excellent corrosion resistance, good welding properties and mechanical properties. Suitable for use in the marine environment.

Applications: Commonly used in ship hulls, ship structures and marine engineering.

- Marine Aluminum Alloy 5086:

Features: high strength and corrosion resistance, especially suitable for use in seawater environment. Better welding performance.

Applications: used for ship shells, decks and other structural components.

- Marine Aluminum Alloy 6061:

Characteristics: good mechanical properties and workability, high strength. Suitable for heat treatment.

Applications: commonly used for structural parts and fittings of ships.

- Marine Aluminum Alloy 6063:

Features: good corrosion resistance and surface treatment properties, commonly used in the manufacture of complex profiles.

Application: Used for decorative and structural parts of ships.

- Marine Aluminum Alloy 7075:

Characteristics: Extremely high strength, but relatively low corrosion resistance. Surface treatment is often required to improve corrosion resistance.

Applications: Used in marine components where high strength is required, such as certain structural parts and fittings.

These marine grade aluminum sheet metal are widely used in shipbuilding for their excellent physical and mechanical properties to meet a variety of design requirements and operating environments. Factors such as strength, corrosion resistance, weldability, and processability are usually considered when selecting an alloy.