What is material grade 5083?

5083 is a marine-grade aluminum alloy that is often used for shipbuilding, offshore structures, and other applications in harsh marine environments. It has excellent corrosion resistance and high strength, making it a popular choice for these types of applications.

5083 h321

The chemical composition of 5083 aluminum alloy typically includes:

  • Aluminum (Al): 93.6%
  • Magnesium (Mg): 4.9%
  • Manganese (Mn): 0.7%
  • Chromium (Cr): 0.1%
  • Iron (Fe): 0.4%
  • Silicon (Si): 0.4%
  • Copper (Cu): 0.1%
  • Zinc (Zn): 0.25%
  • Titanium (Ti): 0.15%
  • Other elements: 0.15% (each) max


  • Strength: 5083 aluminum has high strength, with a typical yield strength of around 240 MPa and ultimate tensile strength of 330 MPa.
  • Corrosion resistance: One of the main advantages of 5083 aluminum is its excellent resistance to corrosion, particularly in marine environments where it may be exposed to saltwater and other harsh conditions. This is due to the high magnesium content in the alloy, which forms a protective oxide layer on the surface of the metal.
  • Weldability: 5083 aluminum is considered to be a good material for welding, with a low tendency to crack during welding and high joint efficiency. However, it is important to use proper welding techniques and filler materials to ensure a strong and durable weld.
  • Formability: 5083 aluminum is also known for its good formability, meaning it can be easily shaped or bent into various configurations without cracking or breaking.
  • Density: The density of 5083 aluminum is around 2.68 g/cm³, which is relatively low compared to other metals. This can be an advantage in some applications where weight reduction is important.
  • Heat treatment: 5083 aluminum can be heat treated to increase its strength and hardness. However, this may also reduce its corrosion resistance, so it is important to balance these properties carefully when choosing a heat treatment process.
  • Machinability: 5083 aluminum is generally considered to have poor machinability, meaning it can be difficult to cut, drill, or mill. This is partly due to its high strength and hardness, which can cause tool wear and damage.
  • Availability: 5083 aluminum is widely available from many suppliers and manufacturers around the world. It is typically sold in sheet or plate form, but can also be found in other shapes such as extrusions or forgings.
  • Standards and specifications: There are several standards and specifications that apply to 5083 aluminum, including those from organizations such as ASTM International, SAE International, and the International Organization for Standardization (ISO). These standards cover aspects such as chemical composition, mechanical properties, and manufacturing processes.


  • Applications: Due to its combination of high strength, corrosion resistance, weldability, and formability, 5083 aluminum is commonly used in marine applications such as boat hulls, superstructures, and offshore platforms. It is also used in other industries where corrosion resistance and strength are important, such as aerospace, transportation, and construction.

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