5383 H321 Aluminum

5383-H321 aluminum has high strength and excellent corrosion resistance, making it suitable for high-load marine applications, especially in environments that require resistance to intergranular corrosion and exfoliation corrosion.

5383-H321 aluminum is the H321 temper of 5383 aluminum alloy, enhanced through specific strain hardening and stabilization processes to improve the material's mechanical properties. While increasing strength, it maintains good corrosion resistance. The H321 treatment ensures long-term stability of the alloy in marine environments, particularly in resisting intergranular corrosion and exfoliation corrosion.

5383-H321 aluminum is an alloy that has been enhanced through strain hardening and stabilization treatments, offering high tensile strength and yield strength. Its strength is between the annealed (O) and fully hardened (H38) states, making it suitable for high-load marine applications that require strong mechanical properties. At the same time, the H321 treatment process enhances its ability to resist intergranular corrosion and exfoliation corrosion, ensuring a longer service life in seawater and salt environments. It is ideal for use in ships, offshore platforms, and marine structures that require a balance of strength and corrosion resistance.

Characteristics of 5383-H321 Aluminum

Temper and Hardness

The H321 temper of 5383 aluminum alloy is made through strain hardening and stabilization treatments, with strength between the annealed (O) and fully hardened (H38) states, typically one-quarter of the fully hardened state’s strength.

In this process, the alloy undergoes cold working to induce strain hardening, followed by heat treatment to stabilize the alloy, thus improving its strength and durability.

Strength and Toughness

5383-H321 aluminum alloy has higher strength than the H116 temper, especially showing significant improvements in tensile strength and yield strength. This allows it to withstand higher working loads and mechanical stresses.

However, despite its higher strength, its toughness is relatively lower, making it suitable for high-load structural components that require high strength.

Resistance to Intergranular Corrosion and Exfoliation Corrosion

During the H321 treatment, the alloy’s resistance to intergranular corrosion and exfoliation corrosion is strengthened. The stabilization process effectively suppresses corrosion at grain boundaries, thus increasing the alloy's durability in marine environments.

This treatment ensures that 5383-H321 aluminum maintains good structural stability even after prolonged exposure to saltwater, humidity, and other harsh environments.

Corrosion Resistance

5383-H321 aluminum has excellent corrosion resistance, particularly excelling in seawater corrosion. Its resistance to seawater, moisture, and salt corrosion makes it an ideal material for marine engineering and shipbuilding.

Compared to other aluminum alloys, the H321 temper of 5383 aluminum alloy offers a distinct advantage in corrosion resistance, making it suitable for applications exposed to harsh environments for extended periods.

5383 H321 Aluminum Mechanical Properties

Property	5383-H321 Aluminum
Brinell Hardness	90
Elastic (Young's, Tensile) Modulus, x 10⁶ psi	9.9
Elongation at Break, %	12
Fatigue Strength, x 10³ psi	30
Poisson's Ratio	0.33
Shear Modulus, x 10⁶ psi	3.7
Shear Strength, x 10³ psi	30
Tensile Strength: Ultimate (UTS), x 10³ psi	50
Tensile Strength: Yield (Proof), x 10³ psi	36

5383 H321 Aluminum Thermal Properties

Property	5383-H321 Aluminum
Latent Heat of Fusion, J/g	390
Maximum Temperature: Corrosion, °F	150
Maximum Temperature: Mechanical, °F	400
Melting Completion (Liquidus), °F	1200
Melting Onset (Solidus), °F	1010
Specific Heat Capacity, BTU/lb-°F	0.22
Thermal Conductivity, BTU/h-ft-°F	72
Thermal Expansion, µm/m-K	24

5383 H321 Aluminum Electrical Properties

Property	5383-H321 Aluminum
Electrical Conductivity: Equal Volume, % IACS	29
Electrical Conductivity: Equal Weight (Specific), % IACS	97

5383 H321 Aluminum Alloy Composition

Element	Composition Range (%)
Aluminum (Al)	92.0 to 95.3
Magnesium (Mg)	4.0 to 5.2
Manganese (Mn)	0.7 to 1.0
Zinc (Zn)	0.0 to 0.4
Silicon (Si)	0.0 to 0.25
Chromium (Cr)	0.0 to 0.25
Iron (Fe)	0.0 to 0.25
Zirconium (Zr)	0.0 to 0.2
Copper (Cu)	0.0 to 0.2
Titanium (Ti)	0.0 to 0.15
Residuals	0.0 to 0.15

5383 H321 Aluminum Applications

Due to its high strength, good corrosion resistance, and enhanced durability through stabilization treatment, 5383-H321 aluminum is widely used in marine environments that endure significant stress and high loads, especially in engineering applications that require long-term stability and high mechanical performance.

Application	Description
Offshore Platforms	5383-H321 aluminum is used in offshore platforms, especially in parts exposed to marine climates that need to withstand extreme environments and loads. These platforms often need to maintain structural stability in high salt, humidity, and fluctuating wave conditions. H321 temper aluminum alloy, with its strong corrosion resistance, is the ideal material in marine engineering for parts exposed to high mechanical stress and corrosive environments.
Ship Hull Frames	In shipbuilding, 5383-H321 aluminum is widely used in the manufacture of ship hull frames and ship structures. Due to its high tensile strength and yield strength, H321 aluminum alloy is suitable for components that require high strength and long-term corrosion resistance, such as the load-bearing structures and key connection parts of ships. These parts typically need to endure substantial external stresses and extreme marine environmental conditions.
Marine Structural Components	Due to its excellent corrosion resistance, 5383-H321 aluminum alloy is widely used in marine structural components, such as supporting structures for offshore platforms, floating structure parts, and more. These structures need to be used for long periods in harsh marine environments, facing high-strength loads and the corrosion effects of seawater, making H321 aluminum alloy the ideal choice.
High-Load Components	H321 aluminum alloy is widely used in the manufacture of high-load components due to its high strength and corrosion resistance, such as the foundation frames for offshore wind turbines, and critical structures in offshore oil and gas production equipment. These components often operate under extreme working conditions, needing to withstand immense pressure and strength loads, while also requiring corrosion resistance to prevent seawater from damaging the material.
Marine Engineering Requiring Long-Term Stability	In marine engineering projects requiring long-term stability, 5383-H321 aluminum alloy is used to manufacture components exposed to seawater for extended periods, such as marine buoys, support columns, and connection structures for offshore oil platforms. Its excellent corrosion resistance and high strength enable it to effectively withstand long-term environmental pressure, ensuring the reliability and stability of structures over time.

5383-H321 aluminum, due to its strength and corrosion resistance, is widely used in high-load and high-stress marine environments, such as offshore platforms, ship hull frames, marine structural components, and other marine engineering parts. It is suitable for applications that require long-term durability and high mechanical performance, especially in harsh marine environments, effectively resisting seawater corrosion and mechanical wear to ensure the stability and service life of engineering structures.

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