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Seamless Aluminum Tube is manufactured without welded joints, providing superior structural integrity, pressure resistance, and dimensional consistency. Available in alloys such as 6061, 6063, 5052, and 5083, it is widely used in applications requiring high reliability and precision.
Its lightweight construction, excellent corrosion resistance, and outstanding machinability make it an ideal solution for aerospace, hydraulic systems, transportation, industrial equipment, and custom engineering projects.
Seamless aluminum tube is aluminum tube with no longitudinal weld seam. It is produced either by mandrel extrusion or by cold drawing an extruded seamless tube blank to tighter tolerances. Unlike structural (porthole) extruded tube, which is re-welded inside the die, a seamless tube has a uniform wall without a seam line, which makes it the preferred choice for applications involving internal pressure, high loads or strict appearance requirements.
At XQJ Metal, we supply and export seamless and structural aluminum tube produced to international standards, including ASTM B241, ASTM B210, ASTM B221, EN 755, EN 754 and EN 573, according to order requirements. Available alloys include 6061-T6, 6063-T5, 5083-H112 and 7075-T6, supplied in cold-drawn or mandrel-extruded form, with mill finish, anodized or other surface treatments on request.
| Alloy Grade & Temper | Standard Dimensional Range (OD x Wall Thickness) | Primary Engineering Properties | Surface Processing Options |
|---|---|---|---|
| 6061-T6 (Structural Grade) | OD 6.0mm to OD 300mm (Wall: 1.0mm – 25mm) | Good strength, good weldability and corrosion resistance, good machinability | Mill Finish, Clear Anodized, Hard Anodized, CNC Machined |
| 6063-T5 (Architectural/Precision) | OD 4.0mm to OD 200mm (Wall: 0.8mm – 15mm) | Smooth surface, good extrudability, well suited to anodizing and decorative use | Clear Anodized, Color Powder Coated, Polished Finish |
| 5083-H112 (Marine Grade) | OD 12.0mm to OD 400mm (Wall: 2.0mm – 30mm) | Excellent seawater corrosion resistance, good fatigue performance | Mill Finish, Protective PVC Film |
| 7075-T6 (High-Strength Grade) | OD 10.0mm to OD 250mm (Wall: 1.5mm – 20mm) | Very high strength and hardness; limited weldability and formability | Mill Finish, Honed, Sandblasted, Anodized |
Dimensional ranges and tolerances are confirmed per order. Chemical composition and mechanical properties are stated in the Mill Test Certificate.
Choosing the right manufacturing process is essential when specifying a seamless aluminum tube for structural or fluid power systems:
Our seamless aluminum tube is used across these industrial sectors:
XQJ Metal checks each shipment of seamless aluminum tube against the order specification before dispatch:
Q1: What is the difference between seamless aluminum tubes and structural extruded aluminum tubes?
A: Structural (porthole) extruded tubes are made by pushing aluminum through a bridge or porthole die. The metal splits and re-welds inside the die, leaving a weld line along the tube. Seamless tubes are extruded over a mandrel or cold-drawn from a seamless blank, so there is no weld line. Seamless tube is recommended for applications with internal pressure.
Q2: How do I choose between 6061, 6063, 5083 and 7075?
A: 6061-T6 has higher strength and is the common choice for structural and machined parts. 6063-T5 has a smoother surface and anodizes well, so it is often used for architectural and decorative parts. 5083 is chosen for marine use, and 7075-T6 where very high strength is required.
Q3: Can XQJ Metal provide cutting and additional machining for seamless aluminum tubing?
A: Yes. We can supply cut-to-length tube and additional processing such as CNC machining or honing on request. Please send your drawing, tolerance requirements and quantity.
Q4: Do you provide a Mill Test Certificate?
A: Yes. An EN 10204 3.1 Mill Test Certificate showing chemical composition and mechanical properties can be provided with the shipment. Please request it when ordering.
Q5: What are the minimum order quantity and lead time?
A: They depend on alloy, temper, size and whether a custom die is required. Please send the alloy, temper, outer diameter x wall thickness, length and quantity, and we will confirm MOQ and lead time in the quotation.
Q6: How is seamless aluminum tubing packed for export?
A: Tube ends are fitted with plastic plugs, the tubes are wrapped in moisture-proof polyethylene film, and they are packed in wooden crates or on skids for sea or air shipment.
To request a quotation based on your drawing, or wholesale pricing for seamless aluminum tube, Contact Our Team today.
Our materials support a wide range of construction and infrastructure projects
Seamless aluminum tube is manufactured without a longitudinal weld, providing a uniform structure throughout the tube wall. Welded aluminum tube is formed from rolled material and joined by welding, making it suitable for many general-purpose applications. The appropriate tube type should be selected according to the application's pressure, performance, and fabrication requirements.
The seamless construction provides uniform wall integrity without a welded seam, making seamless aluminum tube a preferred choice for hydraulic systems, pneumatic equipment, heat exchangers, and other applications where pressure resistance and reliability are important.
Seamless aluminum tube is commonly selected for applications involving internal pressure, demanding mechanical performance, or environments where consistent tube integrity is critical. The appropriate alloy, temper, and dimensions should be selected according to the operating conditions and system requirements.
It offers excellent resistance to seawater corrosion and maintains strength in humid and salt-rich conditions.
No. Strength is achieved through strain hardening rather than heat treatment.
Yes. It provides excellent weldability for structural fabrication.
Yes, it is commonly applied in tanks and pressure equipment.
Yes. It provides higher strength compared with most non-heat-treated aluminum alloys.
Yes. Thickness, width and temper can be adjusted based on project demand.
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