5083 H321 is a non-heat-treatable aluminum-magnesium alloy produced by GNEE, a leading aluminum supplier in China, known for its exceptional mechanical strength, superior weldability, and outstanding resistance to seawater and industrial corrosion.
The H321 temper represents strain hardening followed by a low-temperature stabilization treatment. This process significantly enhances the alloy's resistance to stress corrosion cracking while maintaining excellent formability. As a marine-grade alloy, GNEE 5083-H321 aluminum plate is widely applied in shipbuilding, cryogenic tanks, pressure vessels, and railway vehicle manufacturing.
5083 H321 aluminum offers medium strength, with tensile and yield strength superior to most conventional aluminum-magnesium alloys. It cannot be strengthened by heat treatment; instead, it achieves its strength through cold working.
GNEE 5083 H321 Aluminum Sheet
GNEE 5083-H321 belongs to the 5xxx series of high-strength aluminum alloys, highly regarded for its excellent corrosion resistance and adaptability to marine environments. The H321 tempering process involves initial strain hardening followed by stabilization to ensure dimensional accuracy and consistent mechanical performance.
Chemical Composition
| Element | Content (%) |
|---|---|
| Magnesium (Mg) | 4.00 – 4.90 |
| Manganese (Mn) | 0.40 – 1.00 |
| Chromium (Cr) | 0.05 – 0.25 |
| Iron (Fe) | 0.00 – 0.40 |
| Silicon (Si) | 0.00 – 0.40 |
| Copper (Cu) | 0.00 – 0.10 |
| Zinc (Zn) | 0.00 – 0.25 |
| Titanium (Ti) | 0.00 – 0.15 |
| Aluminum (Al) | Balance |
Designations and Standards
UNS: A95083
ISO: AlMg4.5Mn
ASTM: B209/B209M
ASME: SB209
EN: 573-3 (Chemical Composition), 485-2 (Mechanical Properties)
Physical Properties
| Property | Value |
|---|---|
| Density | 2,650 kg/m³ |
| Melting Point | 570 °C |
| Modulus of Elasticity (E) | 72 GPa |
| Electrical Resistivity | 0.58 × 10⁻⁶ Ω·m |
| Thermal Conductivity | 117 W/m·K |
| Coefficient of Thermal Expansion (20–212°F) | 23.8 µm/m·°C |
Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (0.2% PS) | 215–228 MPa (minimum 215 MPa) |
| Ultimate Tensile Strength (UTS) | 305–350 MPa (typical ~330 MPa) |
| Elongation at Break | ≥10% (typical 16%) |
| Brinell Hardness (HB) | ~89 |
| Fatigue Strength | ~160 MPa |
| Shear Strength | ~190 MPa |
| Shear Modulus | 26 – 26.4 GPa |
| Poisson's Ratio | 0.33 |
Corrosion Resistance
GNEE 5083 H321 aluminum plate demonstrates excellent resistance to seawater and many industrial chemicals, making it ideal for marine and harsh industrial applications. Each batch undergoes exfoliation and intergranular corrosion testing in accordance with ASTM G66 and G67, guaranteeing long-term durability and structural integrity in demanding environments.
Excellent resistance to seawater and industrial corrosion
Stabilized temper minimizes susceptibility to stress corrosion cracking (SCC)
Fabrication Characteristics
Weldability: Excellent-compatible with TIG, MIG, and resistance welding, with minimal post-weld strength loss.
Formability: Good ductility allows bending, rolling, and cold working; formability is comparable to H32, optimal in annealed (O) temper.
Machinability: Fair-due to its slightly gummy texture, using appropriate lubricants is recommended.
Heat Treatment and Tempering (H321)
Strain Hardening: The alloy is cold-worked to achieve desired strength (H32 stage).
Stabilization: Low-temperature heating relieves residual stress without full annealing, converting H32 to H321.
Advantages: Enhances resistance to stress corrosion cracking and improves dimensional stability in welded structures.
Advantages of GNEE 5083 H321 Aluminum
High strength-to-weight ratio
Outstanding corrosion resistance in marine and industrial environments
Maintains excellent performance at low temperatures (ideal for cryogenic applications)
Limitations
Lower formability compared to softer tempers
Non-heat-treatable-strength is derived solely from strain hardening
Applications
Marine and Offshore Engineering: Hulls, decks, superstructures, LNG and cryogenic storage tanks
Transportation: Railcar bodies, truck structures, pressure vessels, automotive parts
Defense and Aerospace: Armor plates, missile casings, aircraft panels
Industrial: Chemical processing equipment, storage tanks, and marine fittings
Key Standards and Specifications
| Standard | Specification |
|---|---|
| ASTM B209/B209M | Aluminum and Aluminum-Alloy Sheets and Plates |
| ASME SB209 | Boiler and Pressure Vessel Plates |
| EN 573-3 | Aluminum Alloy Chemical Composition |
| EN 485-2 | Mechanical Properties of Wrought Aluminum Products |
| ISO 6361-A | Wrought Aluminum and Aluminum Alloy Sheets (All Tempers) |
GNEE, a trusted Chinese supplier, provides 5083 H321 aluminum plates with consistent quality, excellent surface finish, and reliable performance for marine, industrial, and structural applications requiring superior corrosion resistance and mechanical integrity.
