5456 H116 Aluminum
5456 aluminum alloy is a high-strength aluminum alloy widely used in marine, shipbuilding, offshore engineering, and other corrosion-resistant structural components. It has excellent seawater corrosion resistance, making it especially suitable for use in marine environments. The H116 temper is 5456 aluminum alloy that has undergone special heat treatment processes (such as low-temperature aging) to improve its corrosion resistance and strength, making it particularly suitable for marine environments that require higher strength.
5456-H116 aluminum is a 5000 series forged aluminum-magnesium alloy that has undergone special processing to achieve the H116 temper. This temper is achieved through controlled heat treatment and cold working, designed to enhance its resistance to intergranular corrosion and exfoliation corrosion — an especially important attribute for applications in harsh marine environments, shipbuilding, offshore platforms, and other structures requiring long-term exposure to saltwater. Its excellent balance of high strength, corrosion resistance, and weldability makes it a preferred material for critical structural components.
5456 H116 is optimized for marine and aerospace applications, undergoing special heat treatment (H116 temper) to improve its resistance to intergranular corrosion and exfoliation corrosion, making it an ideal choice for demanding environments such as saltwater exposure.
5456 H116 Aluminum Processing and Standards
As a wrought alloy, 5456-H116 can be processed through rolling, extrusion, and forging (although casting is uncommon). It conforms to standards such as ASTM B928, which specifies high-magnesium aluminum alloy sheets and plates for marine service.
- Marine: ASTM B928, DNV, ABS, Lloyd’s.
- Aerospace: QQ-A-250/9, AMS 4344, AS9100.
- General: EN 485-2, ASTM B209.
5456 H116 Aluminum Corrosion Resistance and Weldability
The H116 temper of 5456 aluminum is specifically designed to reduce its susceptibility to intergranular corrosion and exfoliation corrosion. This makes 5456-H116 particularly suitable for marine and offshore applications, as prolonged exposure to saltwater can lead to rapid material degradation. Additionally, its excellent weldability ensures that it can be reliably joined during manufacturing without significantly compromising its mechanical integrity.
Due to its seawater resistance, salt spray resistance, and exfoliation corrosion resistance, it performs exceptionally well in marine environments.
However, when exposed to temperatures above 65°C for extended periods, it is prone to stress corrosion cracking.
5456 H116 Aluminum Chemical Composition
| Alloy | 5456 | |
| Si | ≦0.25 | |
| Fe | ≦0.4 | |
| Cu | ≦0.1 | |
| Mn | 0.50-1.0 | |
| Mg | 4.70-5.50 | |
| Cr | 0.05-0.20 | |
| Zn | ≦0.25 | |
| Ti | ≦0.2 | |
| Zr | - | |
| Standard | EN573 | ASTM B928 |
5456 H116 Aluminum Thermal Properties
- Latent Heat of Fusion: 390 J/g
- Maximum Temperature (Corrosion): 65 °C (150 °F)
- Maximum Temperature (Mechanical): 190 °C (370 °F)
- Melting Onset (Solidus): 570 °C (1060 °F)
- Melting Completion (Liquidus): 640 °C (1180 °F)
- Specific Heat Capacity: 900 J/kg-K
- Thermal Conductivity: 120 W/m-K
- Thermal Expansion: 24 µm/m-K
These thermal characteristics help define the service limits and performance stability of the alloy under elevated temperatures.
5456 H116 Aluminum Comparison with Other Alloys
| Property | 5456-H116 | 5083-H116 | 7075-T6 |
| Tensile Strength | 310–350 MPa | 275–330 MPa | 560–700 MPa |
| Corrosion Resistance | Excellent | Excellent | Moderate |
| Weldability | Excellent | Excellent | Fair |
| Density | 2.66–2.7 g/cm³ | 2.66 g/cm³ | 2.81 g/cm³ |
H116 Temper Heat Treatment Process
The H116 temper is produced through heat treatment processes such as low-temperature aging, aiming to enhance corrosion resistance while ensuring the strength of the aluminum alloy. This temper treatment is typically performed at low temperatures to ensure the aluminum alloy has excellent seawater corrosion resistance, especially against intergranular corrosion and exfoliation corrosion, making it suitable for components exposed to marine environments for long periods.
5456 H116 Aluminum Characteristics
Corrosion Resistance
The main advantage of 5456 H116 aluminum alloy is its excellent seawater corrosion resistance, particularly in marine environments, where it effectively resists corrosion phenomena such as intergranular corrosion and exfoliation corrosion. This makes it widely used in shipbuilding, offshore platforms, and marine engineering equipment.
High Strength
Compared to H111 and H112 tempers, the H116 temper of 5456 aluminum alloy has higher strength, making it suitable for structural applications that require higher strength. This high strength allows H116 aluminum alloy to maintain stability even under harsh marine environmental conditions.
Good Weldability
5456 H116 aluminum alloy has good weldability, making it particularly suitable for large components that require welding, such as ship structures and offshore platforms. It is less likely to experience cracking or degradation of properties in the heat-affected zone during welding.
High Temperature Resistance
Although the H116 temper primarily focuses on corrosion resistance, it also maintains some stability at higher temperatures, making it suitable for certain high-temperature environments.
Strong Adaptability
This aluminum alloy is adaptable to various marine environments, including salt spray corrosion in coastal areas, underwater equipment, offshore platforms, and ship structures, providing long-term stable performance.
5456 H116 Aluminum Applications
Shipbuilding Industry
Due to its excellent corrosion resistance and high strength, 5456 H116 aluminum alloy is widely used in the manufacturing of ship structures, including hull plates, porthole frames, decks, and watertight bulkheads.
Offshore Platforms
5456 H116 aluminum alloy is also significantly used in the structural components of offshore platforms, particularly in equipment that must withstand long-term exposure to marine climates, such as offshore drilling platforms and offshore wind power platforms.
Marine Engineering Equipment
5456 H116 aluminum alloy is used in marine engineering equipment, such as subsea pipelines, submersibles, and marine survey equipment, providing long-term stable performance in harsh environments like seawater and salt mist.
Corrosion-Resistant Structural Components
Due to its outstanding corrosion resistance, 5456 H116 aluminum alloy is commonly used to manufacture various corrosion-resistant structural components, such as seawater pumps, valves, and ship radiators.
Underwater Applications
Additionally, it is used in facilities or components that are exposed to underwater conditions for extended periods, such as underwater pipelines and subsea structures.
5456 H116 Aluminum Mechanical Properties
| Property | Value |
| Young's Modulus | 70, 000 MPa |
| Ultimate Strength | 285–315 MPa |
| Yield Strength | 200–230 MPa (depending on material grade) |
5456 H116 sheet and plate (regular) Aluminium Properties
| Unit System | tmin | tmax | Young's Modulus, E | Ultimate Strength, Fu | Yield Strength, Fy | Fwu | Fwy | Poisson's Ratio, ν | Density, ρ | Thermal Expansion Coef., α | kt |
| Metric | 30 | 40 | 70, 000 MPa | 305 MPa | 215 MPa | 285 | 125 | 0.33 | 2, 700 kg/m3 | 0.4 1/°C | 1 |
5456 H116 sheet and plate (thick) Aluminium Properties
| Unit System | tmin | tmax | Young's Modulus, E | Ultimate Strength, Fu | Yield Strength, Fy | Fwu | Fwy | Poisson's Ratio, ν | Density, ρ | Thermal Expansion Coef., α | kt |
| Metric | 40 | 80 | 70, 000 MPa | 285 MPa | 200 MPa | 285 | 125 | 0.33 | 2, 700 kg/m3 | 0.4 1/°C | 1 |
5456 H116 sheet and plate (thin) Aluminium Properties
| Unit System | tmin | tmax | Young's Modulus, E | Ultimate Strength, Fu | Yield Strength, Fy | Fwu | Fwy | Poisson's Ratio, ν | Density, ρ | Thermal Expansion Coef., α | kt |
| Metric | 2 | 30 | 70, 000 MPa | 315 MPa | 230 MPa | 285 | 125 | 0.33 | 2, 700 kg/m3 | 0.4 1/°C | 1 |
Comparison of 5456 Aluminum Properties in Different Heat Treatment Conditions
5456 aluminum alloy is a high-strength alloy commonly used in the marine and shipbuilding industries, with excellent corrosion resistance, especially suitable for environments that require seawater corrosion resistance. It exhibits different mechanical properties and applications depending on its heat treatment condition.
5456 aluminum alloy has distinct performance characteristics and applications in different heat treatment states. Conditions such as H111, H112, and H116 are suitable for shipbuilding, marine engineering, and corrosion-resistant structural components, while H32, H321, and O states are more appropriate for structural applications that require further processing or higher strength.
- H111 Temper: Suitable for general requirements in shipbuilding, marine engineering, and corrosion-resistant structural components. It offers a certain level of corrosion resistance but has lower strength.
- H112 Temper: This temper offers slightly better performance than H111, with improved mechanical properties and corrosion resistance, making it suitable for general structural components.
- H116 Temper: Enhanced corrosion resistance and strength through special heat treatment processes. It is especially suitable for structural components exposed to higher strength requirements and long-term seawater exposure, such as ships, offshore platforms, and other marine engineering equipment.
- H32, H321, and O Temper: These tempers are more suitable for structural applications that require further processing or higher strength. H32 and H321 offer higher strength, making them suitable for complex parts that require machining, while O temper is suitable for aluminum alloys that need further processing.
Advantages of 5456 H116 Aluminum Over Competitors
| Advantage | Description |
| Strength Advantage | 5456 H116 offers higher yield strength and tensile strength compared to 5083 aluminum alloy. Its exceptional mechanical properties make it suitable for load-bearing structures and large marine equipment. Especially in high-load environments such as shipbuilding and offshore platforms, 5456 H116 provides additional safety assurance. |
| Corrosion Resistance Advantage | The corrosion resistance of 5456 H116 is significantly superior to that of 6061-T6 and 7075-T6 aluminum alloys. Its microstructure, treated to the H116 temper, combined with its special chemical composition, grants it outstanding corrosion resistance in seawater, salt spray, and humid environments. |
Processing Considerations for 5456 H116 Aluminum
- Heat Treatment: The H116 temper involves low-temperature aging to stabilize corrosion resistance while maintaining strength.
- Weldability: Compatible with TIG, MIG, and spot welding; minimal performance degradation in the heat-affected zone.
- Machining: Due to its tendency to work harden, careful machining is required.
5456 H116 aluminum is a versatile, high-performance alloy designed for demanding environments. Its balanced properties make it an indispensable material in the marine and aerospace industries, offering strength, corrosion resistance, and weldability that outperform many alternatives.
5456 H116 aluminum alloy, with its excellent corrosion resistance, high strength, and good weldability, is a key material in the marine and shipbuilding industries. Its specialized heat treatment state ensures long-term stability in seawater corrosion and salt mist environments, making it crucial for applications in offshore platforms, ship structures, and corrosion-resistant equipment.
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