6061-T651 Aluminum Plate ASTM B209

Jude Steel supplies 6061-T651 aluminum plate manufactured to ASTM B209/B209M, with stress-relieved T651 temper for improved dimensional stability during machining. Available in custom thicknesses, widths and lengths with MTR documentation and export packaging.
6061-T651 Aluminum Plate ASTM B209 is a heat-treated aluminum alloy plate known for its excellent strength, corrosion resistance, machinability, and weldability. Manufactured in accordance with ASTM B209, 6061-T651 aluminum plate is one of the most versatile and widely used engineering materials across aerospace, transportation, marine, construction, and precision manufacturing industries.

The T651 temper indicates that the material has been solution heat-treated, stress-relieved by stretching, and artificially aged, providing excellent dimensional stability and reducing residual stresses during machining.
 

 

Item	Specification
Alloy	6061 Aluminum
Temper	T651
Standard	ASTM B209 / B209M
Product Form	Aluminum Plate
Nominal Thickness	6.30–150 mm
Width	Up to 1828 mm
Length	Up to 6096 mm
Surface	Mill Finish
Heat Treatment	Solution Heat Treated & Artificially Aged
Stress Relief	Stretch Stress Relieved
Typical Tensile Strength	290 MPa minimum, depending on thickness
Typical Yield Strength	240 MPa minimum, depending on thickness
Elongation	Varies by thickness
Cutting	Saw Cutting / CNC Cutting / Waterjet Cutting
Inspection	Dimensional Inspection, Chemical Analysis, Mechanical Testing
Certification	Mill Test Certificate (MTC) available
Packaging	Export Seaworthy Packaging

 

 

Thickness	Width	Length	Availability
6–10 mm	1000–1828 mm	2000–6096 mm	In Stock / Custom
12–20 mm	1000–2000 mm	2000–6096 mm	In Stock / Custom
25–40 mm	1000–2000 mm	2000–6096 mm	Custom
45–60 mm	1000–2000 mm	3000–6096 mm	Custom
65–100 mm	1000–2000 mm	3000–6096 mm	Custom
100–150 mm	1000–2000 mm	3000–6096 mm	Custom

 

 

 High Strength

6061-T651 aluminum plate offers an excellent strength-to-weight ratio, making it ideal for structural applications requiring lightweight materials with reliable mechanical performance.

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 Excellent Corrosion Resistance

Its natural oxide layer provides outstanding resistance to atmospheric corrosion, seawater, and many industrial environments, making it suitable for marine and outdoor applications.

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 Superior Machinability

The T651 temper significantly improves machining performance by minimizing deformation during CNC milling, drilling, and precision cutting.

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 Excellent Weldability

6061 aluminum plate can be welded using TIG and MIG welding processes while maintaining good structural integrity after proper treatment.

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 Lightweight Material

With a density of only 2.70 g/cm³, 6061-T651 aluminum is approximately one-third the weight of steel, reducing transportation costs and overall structural weight.
 

 

Element	% Composition
Silicon (Si)	0.40 - 0.80
Iron (Fe)	≤ 0.70
Copper (Cu)	0.15 - 0.40
Manganese (Mn)	≤ 0.15
Magnesium (Mg)	0.80 - 1.20
Chromium (Cr)	0.04 - 0.35
Zinc (Zn)	≤ 0.25
Titanium (Ti)	≤ 0.15
Aluminum (Al)	Balance

 

 

Property	Typical Value
Tensile Strength, Ultimate	≥ 290 MPa
Yield Strength (0.2% Offset)	≥ 240 MPa
Elongation at Break	≥ 8%
Shear Strength	≈ 180 MPa
Brinell Hardness	≈ 95 HB
Elastic Modulus	≈ 69 GPa
Poisson's Ratio	≈ 0.33
Fatigue Strength	≈ 96 MPa

 

 

T651 is a temper designation used for heat-treatable aluminum alloys such as 6061 aluminum. It describes the specific heat-treatment and stress-relieving process used to improve the material's strength, dimensional stability, and machining performance.

For 6061-T651 aluminum plate, the designation means:

T - Heat-treated to produce a stable temper.

6 - Solution heat-treated and artificially aged to increase strength.

51 - Stress-relieved by controlled stretching after solution heat treatment, followed by artificial aging.

In simple terms, 6061-T651 is solution heat-treated, artificially aged, and stress-relieved by stretching. This process reduces residual stresses that can cause distortion during machining.

Why T651 matters:
Compared with untreated or lower-strength tempers, 6061-T651 provides a good combination of high strength, corrosion resistance, machinability, and dimensional stability, making it widely used for CNC machining, aerospace components, structural parts, tooling, and precision aluminum plates.
 

6061-T651 and 6061-T6 have essentially the same basic alloy chemistry and similar strength levels. The main difference is that 6061-T651 is stress-relieved by controlled stretching, which gives it better dimensional stability during machining.
 

Property	6061-T6	6061-T651
Alloy	6061	6061
Temper	Solution heat-treated + artificially aged	Solution heat-treated + stress-relieved by stretching + artificially aged
Tensile Strength	Similar	Similar
Yield Strength	Similar	Similar
Residual Stress	Higher	Lower
Dimensional Stability	Good	Excellent
Machining Distortion	More likely	Less likely
Typical Form	Extrusions, bars, tubes, general products	Plate and precision-machined products
CNC Machining	Suitable	Highly suitable
Precision Components	Good	Better choice

 

6061-T651 aluminum plate is widely used where a combination of high strength, corrosion resistance, weldability, machinability, and dimensional stability is required. Its stress-relieved T651 temper makes it particularly suitable for precision machining and structural applications.

Application	Typical Uses
Aerospace	Aircraft structural components, wing parts, frames, and support structures
CNC Machining	Precision-machined components, brackets, housings, and machine parts
Tooling & Molds	Jigs, fixtures, tooling plates, and molds
Automotive	Chassis components, brackets, structural parts, and lightweight assemblies
Marine	Boat components, marine structures, decks, and fittings
Industrial Equipment	Machine frames, bases, platforms, and structural components
Transportation	Truck and trailer components, rail equipment, and lightweight structural parts
Construction	Structural supports, platforms, frames, and architectural components
Pressure & Hydraulic Equipment	Components requiring good strength-to-weight ratio and machinability

 

 

We supply cut-to-size 6061-T651 aluminum plate for customers requiring specific dimensions for fabrication, CNC machining, and industrial applications. Plates can be cut according to required length, width, and thickness, helping reduce material waste and machining time.

Available services may include:

 Cut-to-length aluminum plate

 Custom width and length

 Saw cutting

 CNC cutting

 Custom thickness

 Precision dimensional requirements

 Small and large quantity orders

6061-T651 aluminum plate is particularly suitable for CNC machined components, tooling plates, structural parts, aerospace components, machine bases, and industrial equipment. The T651 temper provides good dimensional stability and helps minimize distortion during machining.

 

 

T651 stress-relieved temper reduces machining deformation

Excellent machinability for CNC machining and precision fabrication

Strong corrosion resistance for industrial and marine environments

Good weldability for structural and fabrication applications
 

ASTM B209-compliant production

ISO 9001 certified quality management system

SGS third-party inspection support

RoHS & REACH compliance available upon request
 

Incoming raw material inspection

Mechanical property testing: Tensile strength, Yield strength, Hardness, Elongation

Dimension and Thickness accuracy checks

Surface quality inspection
 

Q1: What's the difference between 6061-T6 and T651?

A: T651 undergoes stress-relieving and stretching, reducing internal stresses for better machining stability compared to standard T6.

 

Q2: Can 6061-T651 be welded?

A: Yes, it has excellent weldability using TIG or MIG methods. Post-weld heat treatment may be needed for critical applications.

 

Q3: Is 6061-T651 corrosion-resistant?

A: Yes, 6061 T651 ASTM B209 offers good resistance to atmospheric and marine corrosion, especially when anodized.

 

Q4: Do you provide custom cutting services?

A: Yes! We offer precision CNC cutting, waterjet, and laser cutting to your exact specifications

Q5: Is 6061-T651 aluminum plate suitable for CNC machining?
A: Yes. It offers good machinability and dimensional stability, making it widely used for CNC components, tooling, fixtures, machine parts, and precision structures.
 

Q6: How do I request a quotation for cut-to-size 6061-T651 aluminum plate?
A: Please provide the alloy and temper, thickness, width, length, quantity, required standard, and delivery destination. Our sales team can then confirm availability, cutting requirements, and pricing.
 

Deep Processing Capacity

Custom cutting, bending, U-tube forming, end beveling, polishing and pipe prefabrication as drawings.

Technical Support

Free material selection advice; supply full test reports & MTC certificates; cutting, bending and welding technical guidance.

After-sales Warranty

Guaranteed material composition & dimension; free replacement for unqualified goods within 7 days after receiving; full batch traceability.

Lead Time

10–15 days for standard pipes; 15–25 days for deep-processed customized pipes.

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