When your projects face harsh marine environments or extreme low temperatures, standard materials fail. You need an alloy engineered for maximum durability. 5083 H321 aluminum plate is a high-magnesium, non-heat-treatable alloy specified globally for its exceptional corrosion resistance, high tensile strength, and excellent weldability.
At GNEE, we manufacture and supply premium 5083 H321 aluminum plates that meet stringent international standards, including ASTM B209, ASME SB209, and major marine classification society certifications (ABS, DNV, LR). Whether you are constructing LNG ship hulls or manufacturing industrial pressure vessels, GNEE provides reliable materials tailored to your specifications.
Need ABS/DNV certified marine materials? Contact GNEE today for a free sample, EN 10204 3.1 Material Test Certificates (MTC), and a competitive 5083 aluminum plate price quote within 24 hours.
Chemical Composition of 5083 H321 Aluminum Sheet and Plate
The performance of 5083 aluminum relies on its precise chemical makeup. Magnesium (4.0% - 4.9%) is the primary alloying element, providing the material with its high strength without the need for thermal treatment. The addition of manganese and chromium further enhances its structural integrity and resistance to stress corrosion cracking.
5083 H321 Aluminum Sheet Standard Chemical Composition Limits (Weight %)
| Element | Composition (%) |
|---|---|
| Magnesium (Mg) | 4.0 – 4.9 |
| Manganese (Mn) | 0.40 – 1.0 |
| Silicon (Si) | ≤ 0.40 |
| Iron (Fe) | ≤ 0.40 |
| Zinc (Zn) | ≤ 0.25 |
| Chromium (Cr) | 0.05 – 0.25 |
| Titanium (Ti) | ≤ 0.15 |
| Copper (Cu) | ≤ 0.10 |
| Others (Each) | ≤ 0.05 |
| Others (Total) | ≤ 0.15 |
| Aluminum (Al) | Balance |
Mechanical Properties of ASTM B209 5083 H321 Aluminum Sheet
Compared to the 5052 series, the 5083 alloy offers significantly higher strength while maintaining excellent formability. The 5083 H321 temper specifically provides an optimal balance of tensile strength and ductility.
5083 H321 Aluminum Sheet Typical Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | 46 KSI / ~317 MPa |
| Yield Strength | 33 KSI / ~228 MPa |
| Elongation | 10% |
| Modulus of Elasticity | ~71 GPa |
(Note: Properties for other tempers like O, H112, and H116 are also available upon request. If you plan to buy 5083 H321 aluminum alloy in bulk, GNEE ensures all batches meet these exact mechanical parameters.)
Understanding the 5083 H321 Marine Aluminum Plate
Why is 5083 H321 the preferred temper for marine applications?
The "H321" designation indicates that the 5083 aluminum has been strain-hardened and then stabilized through a specific low-temperature thermal treatment.
High-magnesium alloys (like 5083) can become susceptible to intergranular corrosion and exfoliation corrosion over time if exposed to temperatures above 65°C (150°F). The stabilization process in the H321 temper precipitates the magnesium-silicide network evenly, preventing the continuous grain boundary networks that cause corrosion. This makes the 5083-H321 aluminum heavy plate a highly secure material for long-term seawater exposure.
Solving Industry Pain Points with Custom 5083 Marine Aluminum Plate
Engineers and procurement managers choose GNEE as their 5083 H321 aluminum plate supplier because this specific material directly solves three major industrial challenges:
1. Severe Saltwater Corrosion
In marine environments, continuous exposure to chloride ions destroys standard steel and lower-grade aluminum. 5083 H321 possesses excellent natural resistance to seawater pitting and intergranular corrosion, significantly reducing maintenance costs and extending the lifecycle of ship hulls and offshore platforms.
2. Cryogenic Brittleness
Standard carbon steels become brittle and fracture at sub-zero temperatures. 5083 H321 aluminum plate retains its exceptional ductility and strength even at cryogenic temperatures (down to -195°C / -320°F). It does not experience a ductile-to-brittle transition, making it the standard material for LNG (Liquefied Natural Gas) storage and transportation.
3. Welding Strength Loss
Many high-strength alloys lose significant mechanical integrity in the Heat Affected Zone (HAZ) after welding. 5083 H321 maintains superior strength post-weld compared to 6xxx series alloys. It does not require post-weld heat treatment, streamlining the fabrication process for large structural components.
Typical Applications for 5083 H321 Aluminum Alloy
Because of its high strength-to-weight ratio and resilience, GNEE's 5083 H321 aluminum sheet and heavy plate are specified across multiple heavy industries:
- Shipbuilding and Marine Construction: Ship hulls, decks, superstructures, patrol boats, workboats, and offshore docks.
- LNG and Cryogenic Markets: LNG storage tanks, pressure vessels, and piping systems operating at extreme sub-zero temperatures.
- Transportation: Rail cars, heavy-duty dump trucks, and trailer bodies where payload capacity must be maximized by reducing vehicle weight.
- Defense and Armor: Vehicle armor plates requiring high impact resistance and reduced weight.
- Offshore Drilling Rigs: Structural components exposed to severe maritime weather and chemical stress.
GNEE Manufacturing Specifications of 5083 H321 Aluminum Plate
As a leading custom 5083 marine aluminum plate manufacturer, GNEE offers extensive inventory and custom processing capabilities to meet your exact project requirements.
| Name | 5083 Aluminum Plate/Sheet |
| Hot sale status | O, H112, H116, H321 |
| Thickness(mm) | 0.5-500mm |
| Width(mm) | 20-2650mm |
| length(mm) | 500-16000mm |
| Surface treatment | Anodizing, powder coating, fluorocarbon coating (PVDF coating), electroplating (such as nickel/zinc plating), etc. |
| Typical products | Ship plates, LNG storage tanks, gas cylinders, GIS shells, vehicle body skins, flange materials, etc. |
Ready to Secure Your Supply Chain?
Partner with GNEE, your trusted 5083 H321 aluminum plate supplier. We guarantee international standard compliance, fast global shipping, and uncompromising material quality. Contact Us Now to discuss your project requirements.
Why Trust GNEE as Their 5083 H321 Aluminum Plate Supplier
Procuring marine-grade heavy aluminum plates is a critical investment. At GNEE, we eliminate procurement risks by offering fully transparent, traceable, and certified manufacturing processes.
Here is how we guarantee your peace of mind and secure your project's success:
1. Complete Marine Classification Approvals
GNEE supplies 5083 H321 aluminum plates certified by the world's leading classification societies, including DNV, ABS, LR, BV, and CCS. Every batch is delivered with a fully traceable EN 10204 3.1 or 3.2 Material Test Certificate (MTC), ensuring raw chemical and mechanical data exactly matches your specifications.
2. 100% Flawless Internal Quality Control
For high-thickness 5083-H321 heavy aluminum plates used in pressure vessels or armored vehicles, internal structural integrity is non-negotiable. We conduct 100% Ultrasonic Testing (UT) on our heavy plates to guarantee zero internal defects, porosity, or inclusions. We also fully support and welcome pre-shipment inspections by third-party agencies such as SGS, TUV, or standard-bearers of your choice.
3. Robust Supply Capacity & On-Time Global Delivery
Delays cost money. As a direct custom 5083 marine aluminum plate manufacturer, GNEE maintains a massive inventory of standard marine-grade ingots and billets. This allows us to dramatically shorten lead times. From custom waterjet-cut profiles to bulk tonnage for LNG ship construction, our established global logistics network ensures your material arrives at your port strictly on schedule.
4. The GNEE Zero-Risk Quality Guarantee
We stand firmly behind our products. If any 5083 H321 aluminum alloy delivered by GNEE fails to meet the agreed-upon ASTM B209, ASME SB209, or specific marine class standards upon independent testing, we take full responsibility with a straightforward material replacement policy.
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