5083 and 5086 marine aluminium with ABS (American Bureau of Shipping) certificate are two commonly used aluminum alloys that are widely used in shipbuilding and other offshore structures because of their good corrosion resistance, weldability and moderate strength.

Here is some basic information and characteristics of these two marine aluminum materials:

1. 5083 Marine Aluminum Alloy

• Chemical composition: mainly contains magnesium (Mg) and manganese (Mn), of which the magnesium content is about 4.0% to 4.9% and the manganese content is 0.4% to 1.0%.

• Characteristics:

- High strength: belongs to the high strength type among aluminum alloys, especially suitable for applications requiring high mechanical properties.

- Good weldability: easy to weld, and the weld seam has similar strength to the base material.

- Excellent corrosion resistance: good resistance to seawater and atmospheric conditions.

- Good cold working performance: it can be processed by cold molding, suitable for making complex shaped parts.

• Application scope: commonly used in the manufacture of ship decks, bulkheads, fuel tanks, storage tanks and other structural parts.
  

2. 5086 Marine Aluminum Alloy

• Chemical composition: similar to 5083 marine aluminum alloy, but the magnesium content is slightly lower, generally 3.0%~3.6%.

• Characteristics:

- Medium strength: not as strong as 5083 aluminum, but still meets the needs of most ship structures.

- Excellent weldability: also has good welding performance, suitable for on-site construction.

- Excellent corrosion resistance: strong resistance to long term exposure to seawater and marine environments.

- Good formability: easy to process and form, suitable for manufacturing complex parts.

• Application: Suitable for hull shell, deck, cabin partitions and other parts.
  

Obtaining ABS certification means that these materials have passed the strict quality inspection and performance test of American Bureau of Shipping (ABS), proving that they meet the standards and requirements of the International Maritime Organization (IMO). This means that ships built with these marine grade aluminum materials can sail around the world and enjoy a high level of safety and reliability.

When choosing between 5083 and 5086 marine aluminum alloy, the decision should be based on specific project needs. If higher strength and wider applicability are required, 5083 aluminum can be chosen; while for some application scenarios that do not require extremely high strength but good weldability and formability, 5086 aluminum may be a better choice.

In conclusion, both 5083 and 5086 are proven quality marine aluminium with abs certificate that can meet the needs of most offshore projects. When purchasing, it is important to make sure that the product offered by the material supplier is ABS certified to ensure quality and safety.