Description

6061 T651 aluminum pipe is an Al-Mg-Si heat-treatable aluminum alloy, manufactured through a process of solution treatment, quenching, artificial aging, and tensile (pre-stretching) stress relief (T651 temper). It possesses moderate strength, excellent corrosion resistance, good weldability, and machining stability, making it suitable for high-precision structural components. Common forms include aluminum round tube and square aluminum tubes.

Characteristics of 6061 T651 aluminum pipe:

1. Chemical composition: Primarily composed of Mg (0.8–1.2%), Si (0.4–0.8%), and Cu (0.15–0.4%), with the remainder being Al, and trace amounts of Cr, Zn, Mn, Ti, and Fe (≤0.7%).

2. Mechanical Properties: Tensile strength ≥310 MPa, yield strength ≥276 MPa, elongation ≈12%, hardness approximately 95 HB; 6061 T651 aluminum pipe has lower internal stress than 6061 T6 aluminum pipe, making it less prone to deformation during machining and suitable for precision turning and milling.

3. Processing Properties: Excellent weldability (suitable for TIG/MIG), can be anodized to become anodized aluminum tubes, with a smooth and easily polished surface, and moderate machinability (cold-worked state is better than annealed state).

4. Corrosion Resistance: No significant tendency for stress corrosion cracking; good corrosion resistance in atmospheric, freshwater, and most industrial environments, superior to 2xxx/7xxx series but slightly lower than 5xxx series.

5. Condition Description: T651 = T6 (solution treatment + aging) + 1–5% axial tensile straightening, used for bars/tubes to eliminate residual stress and improve machining accuracy; compared to 6061 T6 Aluminum Pipe, it is less prone to bending or twisting during subsequent machining.

Note: The specific properties of aluminum pipe tubes are affected by wall thickness, forming process (extrusion/drawing), and heat treatment uniformity. Material certificates (such as AMS-QQ-A-250/11 or GB/T 3190) should be verified during procurement.

Applications of 6061 T651 Aluminum Pipe:

6061 T651 Aluminum Pipe is mainly used for structural components requiring medium strength, good weldability, corrosion resistance, and precision machining stability. It is commonly found in aerospace, automotive, shipbuilding, machinery, and electronics industries.

1. Aerospace: 6061 T651 Aluminum Pipe is used for aircraft mounting systems, brackets, oil pipes, and rocket components (because the T651 condition involves tensile stress relief, it is less prone to deformation during machining). 2. Automotive and Rail Transportation: Lightweight structural components, brake pistons, chassis connectors, radiator piping.

3. Marine Engineering: 6061 T651 aluminum pipe for hull fittings, valves, and hardware (resistant to seawater corrosion).

4. Precision Machinery and Automation: Cylinder tubing, hydraulic guide rods, fixtures, sensor housings (high dimensional stability suitable for CNC machining).

5. Electronics and Instrumentation: 6061 T651 aluminum pipe for heat sinks, shielding shells, and precision guide rails (combining thermal conductivity, anodizing capability, and electromagnetic shielding).

6. Construction and Bridges: Load-bearing components, railings, trusses (structural applications requiring weather resistance and weldability).

Product Details and Specification

Product	Aluminum Pipe Tube
Standard	ASTM/ JIS/ GB/ DIN/ BS/ GOST
Thickness (mm)	Thin	0.15-2.0
	Conventional	2.0-6.0
	Middle	6.0-25.0
	Thick	25-200
	Super thick	>200
Status	F XX	Free processing
	O XX	Annealed
	H XX	Work hardening
	W XX	Solid solution heat treatment
	T XX	Heat treatment
Surface	Polyester spraying, power spraying, fluorocarbon spraying, PE film, Mill, Bright, Polished, Hairline etc.
Application	Lighting /Solar reflective sheet/Building appearance/Interior decoration: ceiling, wall/Furniture, cabinets/Elevator/Signs, nameplates, luggage/Interior and exterior decoration of automobiles/Interior decorations: such as Frame/household appliances: refrigerators, microwave ovens, audio equipment/Aerospace aspects/Machining parts processing/Mold manufacturing/Chemical industry/heat preservation pipe coating/High-quality ship board

Features of aluminum product series

Composition	Grade	Property
Pure Aluminum (>99%)	1XXX	No less than 99% aluminum. Excellent corrosion resistance, high thermal and electrical conductivity, low mechanical properties and excellent machinability
Al-Cu	2XXX	Good strength, being the ideal material for manufacturing parts, but the corrosion resistance is weaker
Al-Mn	3XXX	Also known as rust-proof aluminum
Al-Si	4XXX	Commonly used as welding materials, commonly used as building materials. After anodized surface treatment, it will appear dark gray.
Al-Mg	5XXX	Hardened aluminium alloy, suitable for marine climates
Al-Mg/Si	6XXX	Good formability, weldability, machinability and relatively good corrosion resistance
Al-Zn	7XXX	Commonly used in aircraft fuselage structures, mobile equipment and other high-strength parts
Al-Others	8XXX	Good electrical conductivity

COMMON AL & AL ALLOY COMPARISION TABLE

Type/Standard	GB	ASTM	BS	JIS	NF	DIN	GOST
Industrial Pure Al	1A99	1199				A199.99R	A99
	1A97					A199.98R	A97
	1A95						A95
	1A80		1080(1A)	1080	1080A	A199.90	A8
	1A50	1050	1050(1B)	1050	1050A	A199.50	A5
Anti-rust Al	5A02	5052	NS4	5052	5052	AlMg2.5	Amg
	5A03		NS5				AMg3
	5A05	5056	NB6	5056		AlMg5	AMg5V
	5A30	5456	NG61	5556	5957
Hard Al	2A01	2036		2117	2117	AlCu2.5Mg0.5	D18
	2A11		HF15	2017	2017S	AlCuMgl	D1
	2A12	2124		2024	2024	AlCuMg2	D16AVTV
	2B16	2319
Forging Al	2A80			2N01			AK4
	2A90	2218		2018			AK2
	2A14	2014		2014	2014	AlCuSiMn	AK8
Super Hard Al	7A09	7175		7075	7075	AlZnMgCu1.5	V95P
Froging Al Alloy	ZAlSi7Mn	356.2	LM25	AC4C		G-AlSi7Mg
	ZAlSi12	413.2	LM6	AC3A	A-S12-Y4	G-Al12	AL2
	ZAlSi5CulMg	355.2					AL5
	ZAlSi2Cu2Mgl	413		AC8A		G-Al12(Cu)
	ZAlCu5Mn						AL19
	ZAlCu5MnCdVA	201
	ZAlMg10	520.2	LM10		AG11	G-AlMg10	AL8
	ZAlMg5Si					G-AlMg5Si	AL13