When engineers or buyers compare 7075 aluminium plate vs. 6061 aluminium plate, the key question is simple: which alloy fits the real application requirements?
Both alloys are heat-treatable aluminum grades widely used in aerospace, transportation, marine, and industrial equipment. However, their strength, corrosion resistance, weldability, and machinability are very different.
At GNEE, a Chinese supplier of aluminium plates, customers often ask which alloy should be used for structural parts, precision machining, or high-load applications. This guide explains the real differences between 7075 and 6061 aluminium plate to help buyers make the right choice.
7075 Aluminium Plate vs 6061 Aluminium Plate Chemical Composition
The biggest difference between 7075 aluminium plate and 6061 aluminium plate comes from the alloying elements.
7075 belongs to the 7xxx aluminum series, where zinc is the main strengthening element.
6061 belongs to the 6xxx aluminum series, mainly alloyed with magnesium and silicon.
| Element | 7075 Aluminium (%) | 6061 Aluminium (%) |
|---|---|---|
| Aluminium | Balance | Balance |
| Zinc | 5.1 – 6.1 | ≤0.25 |
| Magnesium | 2.1 – 2.9 | 0.8 – 1.2 |
| Copper | 1.2 – 2.0 | 0.15 – 0.40 |
| Chromium | 0.18 – 0.28 | 0.04 – 0.35 |
| Silicon | ≤0.40 | 0.4 – 0.8 |
Because of the higher zinc and copper content, 7075 aluminium plate has much higher strength than 6061.
Strength Difference Between 7075 Aluminium Plate and 6061 Aluminium Plate
For structural applications, strength is usually the most important parameter.
| Property | 6061-T6 Aluminium Plate | 7075-T6 Aluminium Plate |
|---|---|---|
| Yield Strength | 276 MPa | 503 MPa |
| Tensile Strength | 310 MPa | 572 MPa |
| Hardness (HB) | 95 | 150 |
| Elastic Modulus | 68.9 GPa | 71.7 GPa |
In the T6 heat-treated condition, 7075 aluminium plate strength is almost twice that of 6061 aluminium plate.
That is why 7075 aluminium plate is widely called aircraft-grade aluminium.
Typical high-load applications include:
- aircraft structural components
- aerospace parts
- high-performance mechanical parts
- defense equipment
Machinability Comparison of 7075 Aluminium Plate and 6061 Aluminium Plate
Both alloys have good machinability, but 6061 aluminium plate is easier to machine.
Reasons:
- lower hardness
- better chip formation
- lower cutting resistance
This makes 6061 aluminium plate popular for CNC machining parts such as:
- precision fixtures
- electronic housings
- mechanical components
7075 aluminium plate can also be machined well, but tool wear is higher due to its higher hardness.
Welding and Formability of 6061 Aluminium Plate vs 7075 Aluminium Plate
This is another key difference buyers should know.
6061 aluminium plate
- excellent weldability
- good formability
- suitable for welded structures
- Typical applications include:
- aluminum frames
- structural assemblies
- ship fittings
- vehicle structures
7075 aluminium plate
poor weldability
limited formability
normally used in machined parts instead of welded structures
Therefore, if the project requires welding, 6061 aluminium plate is usually the better choice.
Corrosion Resistance of 7075 Aluminium Plate and 6061 Aluminium Plate
Both alloys naturally form a protective oxide layer that improves corrosion resistance.
However:
6061 aluminium plate generally shows better corrosion resistance
7075 aluminium plate may require anodizing or coating in harsh environments
This is especially important for:
marine equipment
outdoor structures
transportation equipment
Density and Thermal Conductivity Comparison
| Property | 6061 Aluminium Plate | 7075 Aluminium Plate |
|---|---|---|
| Density | 2.70 g/cm³ | 2.81 g/cm³ |
| Thermal Conductivity | 167 W/m ·K | 130 W/m ·K |
| Melting Range | 582 – 652 °C | 477 – 635 °C |
Because of its higher thermal conductivity, 6061 aluminium plate is often used in heat-dissipation structures.
Typical Applications of 7075 Aluminium Plate vs 6061 Aluminium Plate
Choosing the correct alloy mainly depends on strength requirements and fabrication process.
7075 aluminium plate applications
- aircraft structures
- aerospace parts
- high-strength tooling plates
- military equipment
- high-load mechanical components
6061 aluminium plate applications
- welded structures
- vehicle frames
- marine components
- molds and fixtures
- electronics structures
Need Reliable Supply of 7075 or 6061 Aluminium Plate?
At GNEE, we supply 6061 aluminium plate and 7075 aluminium plate in multiple tempers such as T6 and T651, with full mill test certification.
Typical supply range:
Thickness: 6 mm – 300 mm
Width: 1000 mm – 3000 mm
Surface: mill finish / precision milled
If you are selecting between 7075 aluminium plate vs 6061 aluminium plate, send us your drawing, size, or application. Our engineers will recommend the most suitable alloy and provide a quotation within 24 hours.
