1. What Is the Hardness of 7000 Series Aluminum Plate? Can It Exceed 150 HB?
The hardness of aluminum plates varies by alloy series.
The 6xxx series aluminum plate typically has a hardness of about 95 HB, while the 2xxx series aluminum plate reaches around 120 HB.
The 7xxx series aluminum plate, especially 7075 aluminum alloy, is significantly harder, with hardness levels exceeding 160 HB.
At GNEE, we can manufacture 7075 aluminum plates with hardness above 150 HB, making them suitable for high-strength structural and aerospace applications.
2. What Is the Surface Finish of GNEE Aluminum Alloy 7075-T651 Plate?
The standard surface condition of the GNEE 7075-T651 aluminum plate is mill finish, which ensures good flatness and excellent machinability.
In addition, GNEE can also supply:
Black surface 7075 aluminum plates
Polished 7075 aluminum plates with a bright and smooth surface
These surface options meet different requirements for machining, tooling, and appearance.
3. What Is the Maximum Thickness of 7075-T651 Thick Aluminum Plate You Can Produce?
GNEE can produce 7075-T651 thick aluminum plates with a maximum thickness of up to 350 mm.
We have already exported more than 300 tons of thick 7075 aluminum plates to markets such as Iran, India, and the United States.
The products demonstrate stable quality, uniform internal structure, and excellent machining performance.
4. What Is the Difference Between Aluminum 2024 and Aluminum 7075?
Both 2024 aluminum alloy and 7075 aluminum alloy are classified as high-strength (hard) aluminum alloys, but they differ in composition and mechanical performance.
How Does the Chemical Composition Differ?
7075 aluminum is an Al-Mg-Zn-Cu alloy
2024 aluminum is an Al-Cu alloy, with copper content typically ranging from 3.8% to 4.9%
How Do the Mechanical Properties Compare?
2024-T4 aluminum plate hardness is approximately 120 HB
7075-T651 aluminum plate hardness exceeds 160 HB
Both alloys can be produced as aluminum plate, bar, pipe, and profile, and both support full heat-treatment processing.
5. Is Aluminum Plate 7075-T651 the Same as 7075-T6? What Does T651 Mean?
7075-T651 and 7075-T6 are not exactly the same, although they share similar strength levels.
The T651 temper indicates that the aluminum plate has undergone:
Solution heat treatment
Stress relief by controlled stretching
Artificial aging
This stress-relief process significantly reduces internal residual stress, ensuring that the plate does not deform during cutting or machining.
For precision machining and large structural parts, 7075-T651 aluminum plate is often preferred over T6.
6. Which Is Stronger: Aluminum 6061 or Aluminum 7075?
7075 aluminum alloy is significantly stronger than 6061 aluminum alloy.
6061-T6 aluminum hardness: approximately 95 HB
7075-T651 aluminum hardness: over 150 HB
This means 7075 aluminum is about 60% stronger than 6061-T6 aluminum.
How Do Their Mechanical Properties Compare?
| Alloy | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 6061 | 310 | 275 | 12 | 95 |
| 7075 | 572 | 503 | 11 | 150+ |
7. Where Are 6061 and 7075 Aluminum Plates Commonly Used?
6061 aluminum plate is widely used in:
Automotive components
Molds
General structural parts
7075 aluminum plate is mainly used in:
Aerospace structures
Aircraft components
Military and defense equipment
High-stress tooling and fixtures
Due to its exceptional strength-to-weight ratio, 7075 aluminum remains the preferred material for aerospace applications, while 6061 aluminum is favored for versatile and cost-effective uses.
Why Choose GNEE 7075-T651 Aluminum Plate?
GNEE supplies high-quality 7075-T651 aluminum plates with:
High hardness and strength
Excellent dimensional stability
Ultra-thick plate capability
Proven global export experience
Our aluminum solutions are trusted worldwide for aerospace, tooling, and high-performance engineering applications.
