6061 Aluminum Plate Tempers Explained: 6061-T6 vs 6061-T651 vs 6061-T6511
GNEE is a professional manufacturer and global supplier of 6061 aluminum plate, offering stable quality materials for machining, structural, and engineering applications. Among the most common tempers, 6061-T6, 6061-T651, and 6061-T6511 aluminum plates each provide distinct performance advantages. Understanding these differences is essential for selecting the right aluminum plate for your specific design and manufacturing needs.
Overview of 6061 Aluminum Plate
6061 aluminum plate is a magnesium–silicon alloy valued for its excellent mechanical strength, corrosion resistance, and machinability. It is widely used in aerospace, transportation, tooling, and structural applications. Different tempers adjust internal stress, strength, and formability, making 6061 suitable for a wide range of part geometries.
What Is 6061-T6 Aluminum Plate?
The 6061-T6 aluminum plate temper refers to solution heat treatment followed by artificial aging. During solution heat treatment, the alloy is heated above the solvus temperature so alloying elements dissolve evenly into the aluminum matrix. Artificial aging then strengthens the material by forming fine precipitates.
Key features of 6061-T6 aluminum plate include:
Good strength and hardness
Balanced machinability and formability
Commonly supplied in thinner plate and sheet forms
Typically available in thicknesses below 0.25 inch
This temper is often selected for general-purpose structural and machined components.
What Is 6061-T651 Aluminum Plate?
6061-T651 aluminum plate undergoes the same heat treatment as T6 but includes an additional stretch stress-relief process after solution heat treatment. This process reduces internal stresses, improving dimensional stability during machining.
Characteristics of 6061-T651 aluminum plate:
Supplied mainly as plate stock
Minimum thickness typically ≥ 0.25 inch
Higher strength than T6 due to controlled stretching
Reduced risk of warping and distortion
Uniform grain structure and surface finish
Because of its stability and strength, 6061-T651 aluminum plate is widely used for large, flat, precision-machined parts.
If your project requires stable, flat, and high-strength aluminum plate for CNC machining, GNEE's 6061-T651 aluminum plate is an ideal solution. Contact us for available sizes and technical support.
What Is 6061-T6511 Aluminum Plate?
6061-T6511 aluminum plate is typically supplied as an extruded bar or rod rather than a rolled plate. It receives the same heat treatment as T6, followed by stress relief and straightening.
Key points of 6061-T6511 aluminum plate:
Extruded bar or rod form
Stress-relieved for improved straightness
Often dual-certified to meet T6 requirements
Generally lower cost than T651 plate
Greater formability compared to T651
For applications that do not require the flatness and residual stress control of plate stock, T6511 is a cost-effective alternative.
6061-T651 vs 6061-T6 vs 6061-T6511 Aluminum Plate Comparison
| Temper | Typical Form | Strength Level | Formability | Dimensional Stability | Common Uses |
|---|---|---|---|---|---|
| 6061-T651 | Aluminum plate | Highest | Lowest | Excellent | Precision machined plates, large flat parts |
| 6061-T6 | Sheet / thin plate | Medium | Moderate | Good | General structural and machined components |
| 6061-T6511 | Extruded bar/rod | Medium | Highest | Moderate | Turned parts, general machining |
Interchangeability of 6061-T6 and 6061-T6511 Aluminum Plate
In many cases, 6061-T6 aluminum plate and 6061-T6511 aluminum plate may be dual-certified, as shown on mill test reports. This allows T6511 extrusions to meet T6 requirements. However, 6061-T651 aluminum plate cannot be substituted where T6 is specified due to differences in processing and form.
Typical Chemical Composition of 6061 Aluminum Plate
| Element | Content (%) |
|---|---|
| Aluminum (Al) | Balance |
| Magnesium (Mg) | 0.80 – 1.20 |
| Silicon (Si) | 0.40 – 0.80 |
| Copper (Cu) | 0.15 – 0.40 |
| Chromium (Cr) | 0.04 – 0.35 |
| Iron (Fe) | ≤ 0.70 |
| Zinc (Zn) | ≤ 0.25 |
| Titanium (Ti) | ≤ 0.15 |
Mechanical Properties of 6061 Aluminum Plate (Typical)
| Property | 6061-T6 / T651 |
|---|---|
| Tensile Strength | ~290 MPa (42 ksi) |
| Yield Strength | ~240 MPa (35 ksi) |
| Elongation | 8–12% |
| Hardness | ~95 HB |
| Density | 2.70 g/cm³ |
Common Size Range of 6061 Aluminum Plate
| Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|
| 6 – 150 | ≤ 2600 | ≤ 12000 |
| Custom sizes | Available | On request |
Conclusion: Choosing the Right 6061 Aluminum Plate Temper
6061 aluminum plate remains one of the most versatile aluminum alloys in modern manufacturing.
6061-T6 aluminum plate offers a strong balance of strength and workability
6061-T651 aluminum plate provides maximum stability for precision machining
6061-T6511 aluminum plate delivers flexibility and cost efficiency for extruded applications
Selecting the correct temper ensures optimal performance, dimensional accuracy, and cost control.
Contact GNEE for 6061 Aluminum Plate Solutions
As a trusted supplier, GNEE provides 6061-T6, 6061-T651, and 6061-T6511 aluminum plates with complete certifications, a stable supply, and custom size options.
Need pricing, technical advice, or fast delivery?
Contact GNEE today to receive a professional quotation and expert support for your aluminum plate requirements.
