7020 Aluminum Tube is a heat-treatable aluminum alloy primarily composed of zinc and magnesium, known for its high strength, excellent weldability, and good corrosion resistance. It is widely used in aerospace, rail transit, military equipment, bicycle and wheelchair frames, and other lightweight structural applications.
Compared to 7075 aluminum tube, 7020 offers better weldability while maintaining high strength, making it ideal for fatigue-resistant and corrosion-prone environments.
Chalco supplies 7020 aluminum tubes in various specs, including seamless extrusion, cold drawing, roll forming, and hydroforming. Options include straight tubes, custom profiles, thin- and thick-wall structures, with T5/T6 tempers. Surface finishes like anodizing, powder coating, and polishing are also available to suit specific applications.
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7020 Extruded Aluminum Tube
OD: 0.314" - 12" (3mm - 300mm)
Wall: 0.032" - 0.5" (0.8mm - 12.7mm)
Standard: EN 755, EN 573, EN 515
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7020 Cold Drawn Aluminum Tube
OD: 0.2" - 8.66" (5mm - 220mm)
Wall: 0.02" - 0.39" (0.5mm - 10mm)
Standard: EN 754, EN 573, EN 515
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Key Performance Advantages of 7020 Aluminum Tube
7020 aluminum alloy tubes offer an ideal combination of high strength, excellent weldability, and lightweight performance, making them especially suitable for aerospace, rail transit, and advanced structural engineering where structural reliability and weight reduction are critical.Core Properties Include:
High Strength & Lightweight
Tensile strength exceeds 350 MPa with a low density of 2.78 g/cm³, offering the perfect balance between structural safety and weight savings.
Superior Weldability
Compared to 7075, 7020 aluminum tube delivers excellent weld performance, compatible with MIG, FSW (friction stir welding), and more. Weld joint efficiency can reach 0.75 or higher.
Outstanding Fatigue & Corrosion Resistance
Optimized Zn-Mg ratio improves fatigue strength and stress corrosion resistance, ideal for complex load-bearing applications.
Adjustable Heat Treatment
Supports solution treatment and dual-stage aging, further enhancing mechanical properties and weld joint stability.
Excellent Formability & Machinability
Suitable for deep bending, hydroforming, and other precision fabrication processes, perfect for custom profiles and lightweight structural frames.
Typical Applications of 7020 Aluminum Tube
With its excellent strength-to-weight ratio, weldability, and corrosion resistance, 7020 aluminum tubes are widely used in high-strength structural and lightweight system designs across various industries. Below are key application sectors and recommended product types:
Rail Transit Equipment
Used in load-bearing structures, chassis, and connectors of high-speed trains and metro cars, balancing structural integrity and weight reduction.
Temper: T6
Products: Thick-wall structural tubes, custom extruded profiles, elliptical tubes
Aerospace Structures
Ideal for aircraft frames, cabin brackets, and ground test platforms where fatigue resistance and precision are critical.
Temper: T6
Products: Seamless precision tubes, high-strength hydraulic tubes
Military & Armored Systems
Combines high strength with ductility, making it suitable for armored vehicle shells, military bridges, and special vehicle frames.
Temper: T6 / T651
Products: Thick-wall hot extruded tubes, large-diameter welded tubes
Sports & Recreational Equipment
Used in high-end bicycle frames, ski poles, and climbing supports, offering lightweight performance and impact resistance.
Temper: T6
Products: Thin-wall precision tubes, welded round rings
Medical & Assistive Devices
Widely applied in premium wheelchair frames and rehabilitation equipment, delivering both lightweight mobility and structural rigidity.
Temper: T6
Products: Thin-wall round tubes, custom-shaped support tubes
High-Strength Industrial Structures
Provides reliable support in automation systems, heavy-duty brackets, and precision mold structures.
Temper: T6
Products: Medium/thick-wall tubes, custom non-standard structural tubes
Chemical composition of 7020 aluminum tube
| Element | Content (wt%) |
| Si | ≤ 0.35 |
| Fe | ≤ 0.40 |
| Cu | ≤ 0.20 |
| Mn | 0.05 – 0.50 |
| Mg | 1.0 – 1.4 |
| Cr | 0.10 – 0.35 |
| Zn | 4.0 – 5.0 |
| Zr + Ti | 0.08 – 0.25 |
| Others Each | ≤ 0.05 |
| Others Total | ≤ 0.15 |
| Al | Remainder |
Physical properties of 7020 aluminum tube
| Performance Parameters | Value |
| Density | 2.77 g/cm³ |
| Elastic Modulus | 70 GPa |
| Shear Modulus | 26.4 GPa |
| Specific Heat | 875 J/(kg·K) |
| Thermal Conductivity | 130 ~ 160 W/(m·K) |
| Electrical Conductivity | 19 ~ 23 m/Ω·mm² |
| Thermal Expansion Coefficient | 21.4*10-6/k |
Mechanical properties of 7020 aluminum tube
| Performance indicators | Extruded Tube(EN 755-2) | Drawn Tube(EN 754-2 ) |
| Tensile strength Rm (MPa) | ≥ 350 MPa | ≥ 350 MPa |
| Yield strength Rp0.2 (MPa) | ≥ 290 MPa | ≥ 280 MPa |
| Elongation after fracture A (%) | ≥ 10% | ≥ 10% |
| Elongation at A50mm (%) | ≥ 8% | ≥ 8% |
| Brinell hardness HBW | 110 | 110 |
Surface Treatment & Precision Machining Services
To meet the diverse industrial demands for corrosion resistance, appearance, and assembly performance, Chalco offers a one-stop surface treatment and precision machining solution for 7072 aluminum tubes. This ensures that every tube not only delivers excellent performance but also achieves full engineering compatibility and end-use readiness.
Surface Treatment Services
7072 alloy already possesses a strong base level of corrosion resistance. With further treatment, its service life and aesthetic performance can be significantly enhanced. Common treatment methods include:
- Anodizing: Enhances surface wear resistance and corrosion protection; ideal for applications like electronic heat sinks and water-cooling systems, where both appearance and durability are critical.
- Sandblasting / Polishing: Removes oxide layers and microscopic surface defects to improve metallic texture; widely used for decorative or exposed parts.
- Powder Coating / Painting: Available in custom colors, suitable for architecture, automotive, and other environments requiring visual appeal and environmental resilience.
- Anti-Fingerprint Coating / Passivation: Improves stain resistance, ideal for cleanroom settings, medical pipelines, and other specialized environments.
Precision Machining Capabilities
We operate a comprehensive precision processing system, offering a variety of secondary processing services for 7072 aluminum tubes, including:
- Cutting & Bending: Custom lengths and bending angles available; supports various wall thicknesses and bend radii for structural precision.
- CNC Turning / Milling: High-precision end-face machining, drilling, chamfering, and threading, ideal for complex joints and component interfaces.
- Flaring / Reducing: For transitional joints in fluid systems, ensuring secure and adaptable pipe connections.
- TIG / MIG Welding: Expert aluminum welding services, custom-built to your technical drawings.
- Custom Profile Shaping: Round tubes can be reshaped into D-shape, oval, flat-oval, and other custom cross-sections to suit unique assembly or aesthetic needs.
7020 aluminum tube vs. 7075 aluminum tube
| Comparison dimensions | 7020 aluminum alloy | 7075 aluminum alloy |
| Strength (T6) | 370-450 MPa | 500-570 MPa |
| Ductility | Good (suitable for subsequent forming and welding) | Medium to low (high strength but easy to crack) |
| Weldability | Excellent, suitable for welded structures | Poor, not recommended for important welded structures |
| Corrosion resistance | Excellent (especially after anodizing) | Medium (needs anti-corrosion treatment) |
| Processability | Good, suitable for cold working and machining | Good, but pay attention to tool wear when cutting |
| Heat treatment state | Commonly used T5, T6, T651 | Commonly used T6, T651, T7351 |
| Fatigue strength | Good | Extremely high |
| Price level | Medium | High |
| Typical applications | Railway vehicles, motorcycle structures, pressure vessels, military structures | Aircraft landing gear, structural beams, molds, racing car parts |
If weldability and corrosion resistance are key requirements (e.g., rail transit, military applications, or structural tubing), we recommend using 7020 aluminum tube.
If the application demands extremely high strength and fatigue resistance (e.g., aerospace, mold tooling, or racing vehicles), then 7075 aluminum tube is the better choice.
For projects involving high-precision machining and stress fatigue-critical structures, a more refined selection can be made based on the heat treatment temper, such as T651 vs T7351.
Related products of 7020 aluminum tube
3003 Aluminum Tube
5052 Aluminum Tube
5083 Aluminum Tube
5086 Aluminum Tube
6061 Aluminum Tube
6063 Aluminum Tube
6082 Aluminum Tube
7005 Aluminum Tube
7075 Aluminum Tube
FAQs
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Can 7020 aluminum tube replace 7075 aluminum tube?
Yes. 7020 aluminum tube serves as a weldable alternative to 7075, suited for medium-to-high-strength structural applications requiring welding or anodizing. While its strength is slightly lower than 7075, it offers superior corrosion resistance, making it ideal for rail transit, military, and frame components. When balancing strength, weldability, and durability, 7020 delivers the best cost-performance ratio.
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Can 7020 aluminum tube be welded with TIG or MIG welding?
Absolutely. 7020 aluminum tube exhibits better weldability than 7075. Using ER5356 filler wire helps prevent hot cracks, ensuring stable post-weld performance in load-bearing structures.
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What does 7020 aluminum tube look like after anodizing?
7020 aluminum tube anodizes uniformly with a consistent finish and enhanced corrosion resistance, making it perfect for decorative or exposed installations.
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Can 7020 aluminum tube undergo cold forming like bending or flaring?
Yes. For best results, perform bending or flaring in the T4 temper, then apply aging to achieve full strength. In the T6 temper, maintain larger bend radii to avoid cracking.
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Which industries use 7020 aluminum tube?
7020 aluminum tube is widely used in rail vehicles, military frames, and robotic arm structures. It has proven performance in European high-speed trains and tactical equipment.
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How do I determine if my project is suitable for 7020 aluminum tube?
If you require an aluminum tube with weldability, strong corrosion resistance, and at least medium strength, 7020 aluminum tube is an excellent choice. Contact us to evaluate your specific application needs.
Chalco can provide you the most comprehensive inventory of aluminum products and can also supply you customized products. Precise quotation will be provided within 24 hours.
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