Marine Grade EN AW 5083 Aluminum Pipe Description
Available Tempers of 5083 Aluminum Pipe
The temper dictates the mechanical behavior of the 5083 alloy. From our shop floor experience, selecting the wrong temper often leads to cracking during fabrication. Here is how we guide our clients:
- 5083-O Aluminum Tube: This is the softest condition. It provides maximum ductility, making it excellent for heavy bending and complex fabrication without cracking.
- 5083-H111 Aluminum Tube: Slightly work-hardened during the shaping process. It offers a perfect balance between tensile strength and formability. This is our most requested temper for general marine structural components.
- 5083-H112 Aluminum Tube: Supplied in the as-fabricated condition. It guarantees basic mechanical properties and is cost-effective for static structural applications.
- 5083-H116 Pipe: Specifically engineered for marine environments. It undergoes controlled strain-hardening and thermal treatment to provide exceptional resistance to intergranular corrosion and exfoliation in seawater.
- 5083-H321 Aluminum Tube: A stabilized version. It prevents the magnesium from precipitating at the grain boundaries over time, offering superior resistance to stress corrosion cracking (SCC) in long-term offshore use.
Common Shapes of EN AW 5083 Aluminum Tubes
- Round Aluminum Pipe: The industry standard for fluid transfer, pressure vessels, and shipbuilding pipelines. It offers the best pressure distribution.
- Square Aluminum Tube: Widely used in marine frames, support columns, and modular structures where flat surfaces are needed for welding and bolting.
- Rectangular Aluminum Tubing: Ideal for transport structures, trailer beds, and heavy-duty chassis construction due to its high strength-to-weight ratio along a specific axis.
Custom shapes and dimensions are available based on your project requirements.
Need a non-standard dimension? Send us your drawings for a free technical review.
Surface Treatment Options for 5083 Aluminum Tubes
While 5083 naturally resists corrosion, specific environments require upgraded surface protection.
- Mill Finish: The raw, as-extruded surface. Standard for industrial and internal marine use where aesthetics are not a priority.
- Anodized Aluminum Pipe: Anodic oxidation increases the thickness of the natural oxide layer. It significantly improves corrosion resistance and surface hardness.
- Polished Aluminum Tube: Mechanical polishing for aesthetic applications or sanitary environments.
- Sandblasted: Provides a uniform, matte finish, preparing the tube for further coating or painting.
- Powder Coated: Offers a highly durable protective layer against harsh UV rays and chemical exposure.
Surface treatment can be customized according to your application and environment.
5083 Aluminum Chemical Composition (Weight %)
| Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Al |
| ≤ 0.40 | ≤ 0.40 | ≤ 0.10 | 0.40 - 1.0 | 4.0 - 4.9 | 0.05 - 0.25 | ≤ 0.25 | ≤ 0.15 | Remainder |
5083 Aluminum Typical Mechanical Properties (H111 & H116 Tempers)
| Temper | Tensile Strength (Rm) | Yield Strength (Rp0.2) | Elongation (A50mm) | Brinell Hardness |
| O / H111 | ≥ 275 MPa | ≥ 125 MPa | ≥ 16% | ~ 75 HB |
| H116 | ≥ 305 MPa | ≥ 215 MPa | ≥ 10% | ~ 85 HB |
(Note: Data conforms to EN 755-2 and ASTM B241. MTC will be provided per specific batch).
EN AW 5083 Aluminum Pipe Spec Matches
When sourcing materials for marine or high-stress environments, precision matters. At GNEE, we manufacture EN AW 5083 aluminum pipes strictly according to international standards, ensuring your structural integrity is never compromised.
| Item | Technical Details |
| Alloy Grade | EN AW 5083 (AlMg4.5Mn0.7) / UNS A95083 |
| Available Tempers | O, H111, H112, H116, H321 |
| Cross-Section Shapes | Round, Square, Rectangular, Custom Profiles |
| Outer Diameter (OD) | 4mm – 600mm |
| Wall Thickness (WT) | 1mm – 25mm |
| Length | 3m, 6m, or cut-to-length custom sizes |
| Manufacturing Standard | ASTM B241, ASTM B210, EN 755, EN 573 |
Applications of 5083 Aluminum Pipe
Why do engineers specify 5083? Because it retains its strength after welding and does not corrode in saltwater.
- Shipbuilding: Hulls, deck structures, and mast assemblies. The high magnesium content prevents pitting corrosion in marine environments.
- Offshore Platforms: Structural supports and guardrails that must survive continuous salt spray.
- LNG & Cryogenic Tanks: 5083 is unique because its tensile strength actually increases in ultra-low temperatures without becoming brittle.
- Pressure Vessels: Unfired welded pressure vessels requiring high joint efficiency.
- Vehicle Lightweight Structures: Railcars and heavy-duty transport vehicles seeking fuel efficiency without sacrificing rigidity.
Manufacturing Process & Quality Control at GNEE
Trust is built on transparency. Cheap billets lead to micro-porosity, which causes pipes to fail under pressure. At GNEE, we eliminate this risk through our rigorous protocol.
Manufacturing Process:
- Homogenized Billet Casting: Ensuring uniform grain structure.
- Precision Extrusion / Cold Drawing: Shaping to exact dimensional tolerances.
- Heat Treatment: Specifically calibrated for H116/H321 to ensure exfoliation corrosion resistance.
Quality Control (ISO 9001 Certified):
- Ultrasonic Testing (UT): To detect internal flaws or micro-cracks.
- Spectrographic Analysis: To verify precise chemical composition before extrusion.
- Dimensional Inspection: Laser-measured OD, WT, and straightness.
- Mill Test Certificate (MTC): EN 10204 3.1 or 3.2 (via DNV, ABS, or SGS upon request) is issued with every shipment.
GNEE Supply Capability
We bridge the gap between heavy industry capacity and flexible custom orders.
- Monthly Capacity: 2,200 Tons of marine-grade aluminum tubes.
- Delivery Time: 7–25 days depending on temper and mold availability.
- Export Markets: We regularly ship to shipyards and contractors in Europe, the Middle East, and Southeast Asia.
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