5083 aluminum alloy is a commonly used aluminum alloy in the marine and shipbuilding industries and is widely preferred for its excellent corrosion resistance and strength. Different heat-treated tempers of marine grade 5083 aluminum alloy (e.g. H111 and H321) have different mechanical properties and application characteristics.

Marine grade aluminum plate 5083 H111 and H321 in a number of significant differences, the following is a detailed comparison of these two tempers of 5083 marine aluminum plate:

1. The chemical composition and alloying elements

- 5083 H111 aluminum plate: the main alloying element is magnesium, the specific chemical composition includes silicon (0.4%), iron (0.4%), copper (0.1%), manganese (0.3 ~ 1.0%), magnesium (4.4 ~ 4.9%), chromium (0.05 ~ 0.25%), zinc (0.25%), titanium (0.15%).

- 5083 H321 aluminum plate: similar to the state of H111, the main alloying element is also magnesium, but the proportion of the specific chemical composition may vary slightly depending on the production process and manufacturers.

2. Mechanical properties and physical properties

- Strength: 5083 marine aluminum plate has a high yield strength and tensile strength, able to withstand large loads and stresses. H111 and H321 temper in the strength may be slightly different, but can meet the requirements of shipbuilding.

- Corrosion resistance: 5083 marine aluminum sheet is typically rust-resistant and has good corrosion resistance. The H321 temper usually has superior corrosion resistance because it may have undergone more stringent heat treatment or surface treatment during production to improve its corrosion resistance.

- Weldability: 5083 marine grade aluminum plate has good weld resistance and is not prone to cracking when welded.H111 and H321 condition are similar in weldability and both can meet the welding requirements in shipbuilding.

- Density: the specific gravity of aluminum alloy is small, can reduce the weight of the marine grade aluminum plate, save energy consumption, increase the load. 5083 H111 and H321 aluminum plate in the density of no significant difference.

3. Application areas and applicability

- Hull structure: 5083 H111 and H321 aluminum plate are commonly used in the deck of the ship, the engine pedestal, the side of the ship, the bottom of the outer plate and other parts. These parts need to withstand large loads and stresses, and the high strength and good weldability of 5083 aluminum plate can meet these requirements.

- Fuel tanks and tubes: 5083 aluminum plate has good corrosion resistance and weldability, so it is also commonly used in the manufacture of aircraft fuel tanks, tubes, and fuel systems of ships and other components. H321 TEMPER due to its superior corrosion resistance, the application in these areas may be more extensive.

- Other parts: In addition, 5083 H111 and H321 aluminum plate is also used in the manufacture of sheet metal parts of ships, instruments, street lamp brackets, rivets, hardware and electrical enclosures and other parts.

4. The heat treatment state and production process

- H111 temper: said work-hardening state, applicable to the work-hardening without heat treatment to obtain the specified strength of the product. This temper of 5083 aluminum plate usually has better formability and processing performance.

- H321 temper: indicates the work-hardening and stabilization state, applicable to work-hardening after low-temperature heat treatment or due to thermal effects in the heat processing process to stabilize the mechanical properties of the product. This temper of 5083 aluminum plate usually has more excellent corrosion resistance and stability.

In summary, there are significant differences between 5083 H111 and H321 aluminum plates in terms of chemical composition, mechanical properties, application areas and heat treatment state. When choosing marine grade aluminum plate, the appropriate alloy temper and grade should be determined according to the specific application needs and process requirements.