In the global shipbuilding industry, the selection of materials is a critical decision that balances performance, cost, and long-term durability. While various tempers of the 5083 alloy exist, the 5083-H112 aluminum plate holds a unique and vital position. As a hot-rolled, general-purpose marine grade, it offers an excellent combination of strength, workability, and corrosion resistance for a wide range of applications.
As a leading supplier with BV, ABS, and DNV class approvals, GNEE provides this comprehensive technical guide for shipyards, fabricators, and procurement managers. We will detail the specific properties of the AlMg4.5Mn aluminum plate in the H112 temper, its ideal applications, and how it compares to other marine-grade tempers.
The Role of the 5083-H112 Temper in Marine Construction
The 5083 aluminum alloy is a high-magnesium, non-heat-treatable alloy that gains its strength from strain-hardening. The H112 temper is unique because it applies to hot-rolled products that acquire their temper from the shaping process itself, without specific control over the amount of strain-hardening.
This results in a material with moderate strength, excellent ductility, and very good formability. While the premium H116 and H321 tempers are specified for underwater hull plating due to their guaranteed resistance to exfoliation corrosion, the 5083-H112 aluminum plate is the workhorse for numerous other structural and non-structural applications where its balance of properties and cost-effectiveness makes it the ideal choice.
Core Advantages of 5083-H112 Aluminum Plate
1. High Strength with Excellent Fracture Toughness
The 5083-H112 aluminum sheet offers good strength, easily meeting the structural demands of numerous marine applications. Critically, it combines this strength with excellent fracture toughness. This means the material can absorb significant impact energy without fracturing, a vital characteristic for ensuring vessel safety and preventing catastrophic failure in the event of a collision.
2. Superior Seawater Corrosion Resistance
Like all 5083 alloys, the H112 temper is highly resistant to attack from seawater and marine atmospheres. With a uniform corrosion rate of just 0.025-0.05mm per year, it provides decades of reliable service with minimal maintenance, dramatically reducing the lifecycle costs associated with painting and repairs required for steel.
3. Excellent Weldability and Formability
As a hot-rolled product, 5083-H112 aluminum plate has excellent ductility, making it easy to cut, bend, and form. It is also highly weldable using standard shipyard methods like MIG (GMAW) and TIG (GTAW), allowing for the efficient fabrication of complex structures.
4. Lightweight Design for Improved Efficiency
With a density of only 2.66 g/cm³, 5083 aluminum is roughly one-third the weight of steel. Using 5083-H112 aluminum plates for superstructures, internal bulkheads, and other components significantly reduces the vessel's overall weight, improving fuel efficiency and increasing payload capacity.
Understanding 5083 Tempers: H112 vs. H116/H321
| Temper | Description | Best Application |
| H112 | Hot-rolled temper. Moderate strength, excellent formability. | Internal structures, bulkheads, decks, superstructures, general fabrication. |
| H116 | Strain-hardened & stabilized. Guaranteed exfoliation and corrosion resistance. | Primary underwater hull plating, critical structures in direct seawater contact. |
| H321 | Strain-hardened & stabilized. Guaranteed exfoliation and corrosion resistance. | Primary underwater hull plating, critical structures in direct seawater contact. |
The specification of 5083 marine-grade aluminum plate sheet
| Alloy | 5083 |
| Temper | H116, H321 |
| Thickness | 3-50mm |
| Width | 1000-2650mm |
| Length | 2000-12000mm |
| Standard Sizes | 2000*6000mm; 2000*8000mm; 1500*3000mm; |
| Surface | Smooth, Bright, Polished, Blue PVC Film or Paper Interlayer |
Chemical composition of 5083 marine-grade aluminum plate sheet
| Element | Composition % |
| Al | REM |
| Si | ≤0.4 |
| Cu | ≤0.10 |
| Mg | 4.0-4.9 |
| Zn | ≤0.25 |
| Mn | 0.40-1.0 |
| Ti | ≤0.15 |
| Cr | 0.05-0.25 |
| Fe | ≤0.40 |
| Note: Single ≤ 0.05; Total ≤ 0.15 | |
5083 marine-grade aluminum plate Primary Applications
While H116/H321 are for the wetted hull surface, the versatile 5083-H112 plate is widely used for:
- Shipbuilding: Main decks, superstructures, internal bulkheads, engine bases, and ship container side plates.
- Transportation: Bodies for dump trucks, rail cars, and vehicle armor.
- Pressure Vessels: Due to its excellent performance at cryogenic temperatures, the 5083 alloy is the top choice for LNG storage tanks.
Partner with GNEE for Your Certified Marine Aluminum
Whether your project requires the specialized corrosion resistance of H116/H321 or the versatile, cost-effective performance of H112, partnering with a knowledgeable and certified supplier is key. GNEE maintains a comprehensive inventory of BV, ABS, and DNV class-approved 5083 aluminum plates to meet all your shipbuilding needs.
Unsure which 5083 temper is right for your application? Get expert advice.
Contact our technical sales team today for a fast, competitive quote or to discuss your project's specific requirements!
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