Seamless Aluminum Tube

At CHAL Aluminum Corporation, we adopt various operations of value-added steps to produce the highest quality seamless aluminum tube to meet customers’ requirements. Seamless aluminum tubes can be produced in a variety of different sizes and shapes from a wide range of aluminum alloys.

Seamless Aluminium Tube Parameter

Products Detail
Advantages & Applications

What is Seamless Aluminium Tube/Pipe?

An extruded tube is brought to final dimensions by the hot extrusion process and can be seamless or non-seamless (structural tube). Compared to a slit tube(structural tube), an seamless aluminum tube/pipe is a tube that does not have any welding seam.

Our specialized process for seamless tubing manufacturing begins with either an extruded hollow tube or a solid bar drilled to our exact specifications. CHAL seamless tubes are produced using two methods. One method pushes a hollow aluminum billet through a die and mandrel press with tremendous force at high temperatures. The other method pushes a solid billet through a piercer press and then a mandrel pierces and extrudes the billet in a second forward stroke. Regardless of the method used, the tube will have no weld or seam, making it ideal for anodizing and other finishing procedures.

Furthermore, CHAL also provides drawn aluminum tube, a seamless extruded tube that is brought to the final size by drawing through a die. Higher precision tolerances and thinner wall thicknesses than that of the extruded tube are available.

CHAL Aluminium Corporation is the leading manufacturer of seamless aluminum tubes, structural aluminium tubes, aluminum welded tubes, aluminum drawn tubes and aluminum extrusion profiles.

3 Kinds of Seamless Aluminium Tube

Processing consists of extruded seamless aluminum tube, cold drawn precision seamless aluminum tube and rolling seamless aluminum tube. Among them, the cold drawing precision of a seamless aluminum tube with high precision has good surface quality. We provide customized services for raw materials and surface treatment.

Specifications of Seamless Aluminum Tube/Pipe

Products Name	Seamless Aluminum Tube/Pipe (extruded seamless tube and drawn seamless tube)
Outer Diameter	8～ Φ280mm
Wall Thickness	0.1～ 20mm
Alloy Grade	2011, 2024, 3003, 5052, 6061, 6063, 7075, etc.
Surface Treatment	1) Mill finished 2) Anodizing: shiny anodized, frosty anodized 3) Electrophoretic coating: shiny electrophoretic, frosty electrophoretic 4) Electrophoretic color powder coating: normal color, special color 5) Fluorocarbon powder spraying: normal color, special paper 6) Polished

Extruded Seamless Aluminum Tube Specifications

6061 Extruded Seamless Round Tube
AMS QQ-A-200/8, ASTM B221
12′ Lengths


A(Inches)	T(Inches)	Approx WT. Per FT.	Approx WT. Per Length
8.000	0.750	20.088	241.056
8.000	1.000	25.861	310.332
8.500	.250	7.620	91.44
	.500	14.778	177.336
	.750	21.474	257.688
	1.000	27.709	332.508
9.000	.250	8.081	96.972
	.500	15.702	188.424
	.750	21.474	257.688
	1.000	29.555	354.66
9.500	.250	8.542	102.504
	.500	16.625	199.50
	.750	24.244	290.928
	1.000	31.403	376.836
10.000	.500	17.548	210.576
10.000	.750	25.630	307.56


A(Inches)	T(Inches)	Approx WT. Per FT.	Approx WT. Per Length
.190	.035	.0197	.2364
.250	.049	.0364	.4368
.250	.058	.0411	.4932
.313	.035	.0580	.696
	.049	.0477	.5724
	.058	.0545	.654
.375	.035	.0440	.528
	.049	.0590	.708
	.058	.0679	.8148
	.065	.0700	.84
.500	.035	.0601	.7212
	.049	.0816	.9792
	.058	.0947	1.1364
	.065	.1040	1.248
.625	.035	.0763	.9156
1.000	.035	.1248	1.4976

Drawn Seamless Aluminum Tube Specifications

6061 Drawn Seamless Round Tube
ASTM B210, WW-T-700/6
AMS-QQ-A-225/8, ASTM B221
AMS 4082
12′ Lengths


A(Inches)	T(Inches)	Approx WT. Per FT.	Approx WT. Per Length
.190	.035	.0197	.2364
.250	.049	.0364	.4368
.250	.058	.0411	.4932
.313	.035	.0580	.696
	.049	.0477	.5724
	.058	.0545	.654
.375	.035	.0440	.528
	.049	.0590	.708
	.058	.0679	.8148
	.065	.0700	.84
.500	.035	.0601	.7212
	.049	.0816	.9792
	.058	.0947	1.1364
	.065	.1040	1.248
.625	.035	.0763	.9156
1.000	.035	.1248	1.4976
	.049	.1722	2.0664
	.058	.2019	2.4228
	.065	.2245	2.694
	.083	.2812	3.3744
	.125	.4041	4.8492
1.250	.035	.1894	2.2728
	.049	.2627	3.1524
	.058	.3090	3.708
	.065	.3446	4.1352
	.083	.4345	5.214
1.500	.035	.1571	1.8852
	.049	.2174	2.6088
	.058	.2554	3.0648
	.065	.2846	3.4152
	.083	.3579	4.2948
2.000	.049	.3532	4.2384
	.058	.4161	4.9932
	.065	.4647	5.5764
	.083	.5878	7.0536
2.500	.065	.5847	7.0164
2.500	.083	.5810	6.972
3.500	.065	.8250	9.90

You are welcome to contact us for a more detailed specification list.

The Order Process of Seamless Aluminum Tube

Advantages of Seamless Aluminum Tube/Pipe

Without any weld seams, preferred for pressure vessels.
More uniform anodizing appearance, especially on heavier wall sections.
No weld seams that could split informing operation.
Increased structural integrity.
Good mechanical properties.
Good corrosion resistance and oxidation resistance.

The Difference Between Seamless Tube and Structural Tube (Slit Tube)

Different tooling: the seamless tube is extruded over a mandrel utilizing a hollow billet and is the only tubular product recommended for pressure applications. The structural tube is extruded over a bridge or porthole die.
Seamless tube without any welding joint, the structural tube with an indistinguishable weld seam.
Compared to a seamless tube, a structural tube is more able to use multi-hole dies for smaller diameter sizes to improve productivity and decrease costs.
There’s a little difference in appearance. For seamless tubing, the seamless tube’s inner and outer walls are smooth and clean-burning or cracking on the surface; The appearance of the slit tube is generally smooth.

The Production Process of Seamless Aluminum Tube

production process of seamless aluminium tube

Creating an extrusion without seams along its length. This is done by pushing the mandrel from the back into the blank. The tip of the mandrel (at the other end of the die) passes almost all the way through the blank and is very short from the extrusion die. This leaves a small gap between the mandrel and the mould through which the metal can pass.
After the spindle is locked in place, the plunger of the extruder acts on the blank. As the pressure increases, the material is forced to pass through the gap and an extrusion tube appears on the other side.
Aluminum is a good choice for seamless extrusion because it is a very tough material. By heating the billet to a point slightly below its melting point, ductility is further improved and the pressure load is reduced. Most grades of aluminum can be extruded, but some are easy to work hardening, which reduces the maximum extrusion speed. Therefore, the most common extrusion grades are 6061 and 6063, which do not harden.
After extrusion, the heat pipe is cooled and often stretched to improve straightness when a higher quality tube, a thinner wall, or a more uniform size is necessary after the drawing process.

6061 Seamless Aluminum Tube

Grade 6061 seamless aluminum tube has good corrosion resistance, formability, and processability.

An alphanumeric suffix attached to an alloy, such as 6061-T6, indicates tampering or hardness. Taking 6061-T6 as an example, “T6” means that it has undergone solution heat treatment and artificial aging treatment.

6061 is still the most popular. It is famous for having a good appearance after the tube has been anodized.

6063 Aluminum VS. 6061 Aluminum

Similarly, 6061 aluminum is usually compared with 6063 aluminium, because these two grades are usually used to manufacture structural parts. Although the two materials are very similar and often have negligible differences in application, 6061 provides significantly higher yield strength for parts requiring special forces.

Regardless of your choice, 6061 or 6063 aluminum will provide high weldability and formability for your project.

Material	Yield Str. (PSI)	Ultimate Str. (PSI)
6063-T52 AL	21,000 (2)	27,000 (2)
6061-T6 AL	40,000 (1)	45,000 (1)
7075-T6 AL	73,000 (1)	83,000 (1)
ASTM A53 Pipe	30,000 (7)	48,000 (7)