5083 h321 aluminum plate sheet
5083 H321 aluminum plate is a non-heat-treatable high-performance alloy specifically developed for extreme marine and industrial corrosive environments. The stabilized H321 temper ensures long-term resistance to stress corrosion during service life, providing a durable and reliable solution for demanding applications and harsh operating conditions.
Haomei Aluminum supplies high-strength 5083 H321 aluminum plate for shipbuilding, offshore engineering, LNG storage tanks, pressure vessels, and marine structural fabrication with excellent seawater corrosion resistance and certified marine-grade quality.
What is 5083 H321 Aluminum Plate
5083 H321 aluminum plate is a strain-hardened and stabilized marine-grade aluminum alloy with excellent corrosion resistance, high weldability, and outstanding performance in seawater and harsh industrial environments.
Compared with standard 5xxx aluminum alloys, 5083 H321 provides improved resistance to exfoliation corrosion, making it widely used in marine structures, LNG tanks, pressure vessels, and offshore platforms.
- Excellent seawater corrosion resistance
- High strength-to-weight ratio
- Excellent welding performance
- Marine certification support
- Suitable for cryogenic environments
What Does H321 Mean in 5083 Aluminum
H321 is a special temper designation for marine aluminum alloys. The H321 temper indicates that the aluminum plate has been strain hardened and then stabilized through controlled thermal treatment to improve resistance to corrosion and enhance structural stability in marine environments.
5083 H321 aluminum plate is particularly suitable for ship hull structures, offshore engineering, yacht manufacturing, naval applications, and marine transportation equipment requiring long-term seawater exposure.
5083 H321 vs 5083 H116 Aluminum Plate
| Property | 5083 H321 | 5083 H116 |
| Temper Type | Strain Hardened + Stabilized | Special Marine Temper |
| Exfoliation Corrosion Resistance | Higher | Standard Marine Resistance |
| Marine Structural Stability | Excellent | Very Good |
| Offshore Applications | Highly Recommended | Suitable |
| Typical Application | LNG Tanks, Offshore Structures | Shipbuilding |
Haomei 5083 H321 Aluminum Plate Sheet Available Sizes and Global Supply
Haomei Aluminum supplies 5083 H321 aluminum plate sheet in a wide range of thicknesses and dimensions for shipbuilding, marine engineering, LNG storage tanks, pressure vessels, transportation equipment, and corrosive industrial applications. Customized sizes and export services are available to meet different international project requirements.
- Thickness: 0.15mm - 500mm
- Width: 20mm - 2650mm
- Length: 500mm - 16000mm
- Extra-wide marine aluminum plates available
- Custom cut sizes supported
- Standard and special dimensions available
- Hot rolled and precision processed plates supplied
- Large-size aluminum plates for shipbuilding projects
- MOQ flexibility for export orders
- Mill Test Certificate (MTC) available
- ABS, DNV, CCS and other marine certifications available
- Professional seaworthy export packaging
- Fast delivery support for urgent projects
- Global shipping service for industrial customers
- OEM and customized specifications accepted
- Technical support for alloy and temper selection
Marine Certifications for 5083 H321 Aluminum Plate
Haomei 5083 H321 aluminum plate is manufactured for marine, offshore, and high-corrosion industrial applications requiring certified material quality, stable mechanical performance, and long-term seawater corrosion resistance. Marine-grade aluminum plates can be supplied with internationally recognized classification society certifications and inspection documents to meet global shipbuilding and offshore engineering requirements.
- CCS
- ABS
- BV
- LR
- KR
- DNV
- ASTM B928M
- ASTM B928 / ASTM B928M marine aluminum standard
- EN 10204 3.1 Mill Test Certificate available
- Chemical composition and mechanical property inspection
- Ultrasonic testing support for thick aluminum plates
- Export quality inspection before shipment
- Third-party inspection service available
Chemical Composition and Mechanical Properties of 5083 H321 Aluminum Plate
Chemical Composition of 5083 H321 Aluminum Plate
| Element | Content (%) |
| Magnesium (Mg) | 4.0 - 4.9 |
| Manganese (Mn) | 0.4 - 1.0 |
| Chromium (Cr) | 0.05 - 0.25 |
| Silicon (Si) | ≤ 0.40 |
| Iron (Fe) | ≤ 0.40 |
Mechanical Properties of 5083 H321 Aluminum Plate
| Property | Value |
| Tensile Strength | ≥ 305 MPa |
| Yield Strength | ≥ 215 MPa |
| Elongation | ≥ 10% |
| Density | 2.66 g/cm³ |
Haomei Aluminum 5083 H321 Aluminum Plate Manufacturing Capability
Haomei Aluminum supplies high-quality 5083 H321 aluminum plate supported by advanced hot rolling production lines, large-scale manufacturing capacity, and a strict full-process quality control system. Our production capability ensures stable flatness, accurate dimensions, excellent corrosion resistance, and reliable mechanical properties for global marine, shipbuilding, LNG, pressure vessel, transportation, and industrial engineering projects.
Advanced Rolling Equipment
Equipped with 3300mm ultra-wide hot rolling lines, continuous hot tandem rolling systems, and 6-high cold rolling mills, Haomei Aluminum can manufacture extra-wide, extra-thick, and high-precision 5083 H321 aluminum plates for demanding industrial applications.
Large Production Capacity
With a manufacturing base covering over 1.3 million square meters and annual production capacity reaching hundreds of thousands of tons, we support fast delivery for both small trial orders and large-volume export projects.
5083-H321 Aluminum Plate Sheet Surface Quality
Haomei Aluminum 5083 H321 aluminum plate sheet is produced under strict quality control to ensure stable performance, excellent surface condition, and compliance with international standards for marine and industrial use.
Production Quality Control
Every stage from casting, rolling, annealing to finishing is strictly inspected to ensure consistent product quality.
- Chemical composition testing
- Mechanical property testing
- Ultrasonic internal defect inspection
Surface Quality Standard
- No oil, scratches, oxidation spots, or corrosion
- Smooth surface suitable for painting and anodizing
- Good flatness and tight dimensional tolerance
Quality Inspection System
- Ultrasonic flaw detection for internal quality
- Spectral analysis for alloy composition control
- Surface and dimensional inspection system
Export Packaging for 5083-H321 Aluminum Plate Sheet
Haomei Aluminum ensures professional export-grade packaging for 5083-H321 aluminum plate sheets, designed to protect surface quality, prevent corrosion, and guarantee safe long-distance ocean transportation.
- Wooden pallet + steel strap reinforcement
- Waterproof paper + VCI anti-corrosion film
- Edge and corner protection
- Custom labels + export documents
- Ready for global port shipment
Why Choose Haomei Aluminum 5083 H321 Plate
With over 25 years of industry experience, Haomei Aluminum delivers high-performance 5083 H321 aluminum plates trusted by global shipyards, offshore engineering projects, and industrial manufacturers.
Stable production quality with large-width marine aluminum plate manufacturing capability.
Ultrasonic testing, chemical composition analysis, and surface quality control for marine-grade standards.
Exported to shipyards, offshore projects, and industrial manufacturers worldwide.
Proven expertise in aluminum alloy production ensures consistent quality and reliable performance.
Direct-from-manufacturer supply chain with no middlemen, offering competitive pricing and faster delivery.
Established partnerships across 100+ countries ensure stable supply and efficient international logistics.
Haomei 5083 H321 Aluminum Plate Stock List
| Description | Temper | Thickness/in | Form |
| 0.125" ASTM B209, ASTM B928 5083 H321 Aluminum Sheet | H321 | 0.125" | Sheet |
| 0.25" ASTM B209 ASTM B928 5083-H321 Aluminum Plate | H321 | 0.25" | Plate |
| 0.375" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 0.375" | Plate |
| 0.375" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 0.375" | Plate |
| 0.500" ASTM B928 5083 H321 Aluminum Plate | H321 | 0.500" | Plate |
| 0.500" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 0.500" | Plate |
| 0.625" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 0.625" | Plate |
| 0.750" ASTM B928 5083 H321 Aluminum Plate | H321 | 0.750" | Plate |
| 0.750" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 0.750" | Plate |
| 1.000" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 1.000" | Plate |
| 1.250" ASTM B209, ASTM B928 5083 H321 Aluminum Plate | H321 | 1.250" | Plate |
| 1.250" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 1.250" | Plate |
| 1.500" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 1.500" | Plate |
| 2.000" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 2.000" | Plate |
| 2.250" ASTM B928 5083 H321 Aluminum Plate | H321 | 2.250" | Plate |
| 2.500" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 2.500" | Plate |
| 3.000" ASTM B209, ASTM B928 5083 H321 Aluminum Plate | H321 | 3.000" | Plate |
| 3.250" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 3.250" | Plate |
| 3.500" ASTM B209, ASTM B928 5083 H321 Aluminum Plate | H321 | 3.500" | Plate |
| 4.250" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 4.250" | Plate |
| 6.000" AMS4056, QQ-A-250/6 5083 H321 Aluminum Plate | H321 | 6.000" | Plate |
Applications of 5083 H321 Aluminum Plate Sheet
5083-H321 aluminum alloy, known for its excellent strength and corrosion resistance, is widely used in shipbuilding, marine engineering, pressure vessels, and other fields with high material performance requirements.
Shipbuilding & Marine Engineering
- Hull, deck, and superstructure
- Bulkheads, bulwarks, and flooring
- Offshore drilling platforms and living modules
- LNG storage tanks and pipelines
- High-speed passenger ships / yachts construction
Industrial & Structural Applications
- Pressure vessels and cryogenic storage tanks
- Chemical transport vehicles / tank containers
- Curtain walls and bridge structures
- Wind power platforms and mining equipment
- Food processing and pharmaceutical cleanroom equipment
FAQ About 5083 H321 Aluminum Plate
Is 5083 H321 aluminum marine grade?
Yes. 5083 H321 is a certified marine-grade aluminum alloy widely used for shipbuilding and offshore engineering.
What is the difference between H116 and H321?
H321 has additional stabilization treatment and generally offers improved corrosion resistance and structural stability in severe marine environments.
Can 5083 H321 aluminum plate be welded?
Yes. 5083 H321 aluminum alloy has excellent welding performance and is suitable for large marine structural fabrication.
Is 5083 H321 suitable for LNG tanks?
Yes. The alloy has excellent low-temperature performance and is widely used for cryogenic and LNG storage applications.
What is the difference between 5083 H321 and 6061 aluminum plate?
5083 (Al-Mg) offers superior resistance to seawater corrosion, making it ideal for marine environments. 6061 (Al-Mg-Si) provides better machinability and anodizing performance, suitable for general structural applications. For shipbuilding and offshore platforms, 5083 is the widely recognized standard material.
How is the weldability of 5083 H321 aluminum plate? What filler wire is recommended?
5083 H321 has excellent weldability and can be processed using MIG or TIG welding. The recommended filler wire is 5356, which ensures strong weld joints and maintains good corrosion resistance.
Do you provide material certificates and third-party inspection reports?
Yes. Each batch is supplied with a Mill Test Certificate (MTC). Third-party inspections such as SGS or BV can also be arranged upon request to meet project acceptance requirements.
What is the minimum order quantity (MOQ)?
MOQ is flexible depending on thickness and width. We support sample orders and trial orders. Please contact us for detailed requirements and quotations.
What is the typical delivery time?
Standard sizes are usually in stock and can be delivered within 15–25 days after order confirmation. Customized specifications require about 30–40 days. Expedited production can be arranged if needed.
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