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6061 Aluminum Sheet
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6061 aluminum sheet is one of the most widely used heat-treatable aluminum alloys in the 6000 series. It is known for its balanced strength, corrosion resistance, and excellent machinability, making it suitable for both structural and general engineering applications.
Chemical Composition of 6061 Aluminum
| Element | Content (%) |
|---|---|
| Aluminum (Al) | Balance |
| Magnesium (Mg) | 0.8 – 1.2 |
| Silicon (Si) | 0.4 – 0.8 |
| Copper (Cu) | 0.15 – 0.4 |
| Chromium (Cr) | 0.04 – 0.35 |
| Iron (Fe) | ≤ 0.7 |
| Zinc (Zn) | ≤ 0.25 |
| Manganese (Mn) | ≤ 0.15 |
Composition Features
Mg + Si: Form Mg₂Si, improving strength and heat treatment response
Cr: Enhances corrosion resistance and structural stability
Mechanical and Physical Properties
| Property | Typical Value (T6 Condition) |
|---|---|
| Yield strength | ≥ 240 MPa |
| Tensile strength | ≥ 290 MPa |
| Elongation | ≥ 8% |
| Density | 2.70 g/cm³ |
| Hardness | ~95 HB |
Key Characteristics
1. Good Strength-to-Weight Ratio
Stronger than 3000 and 5000 series alloys
Lightweight compared to steel
2. Excellent Machinability
Easy to cut, drill, and mill
Suitable for CNC machining
3. Good Corrosion Resistance
Performs well in atmospheric and mild marine environments
4. Heat Treatability
Can be strengthened through T6 heat treatment
Offers stable mechanical performance
5. Weldability
Good weldability, though strength may reduce in the heat-affected zone
Common Applications
1. Structural and Engineering
Frames, supports, and structural components
Bridges and platforms
2. Transportation Industry
Automotive parts
Railway components
Truck bodies
3. Aerospace and Aviation
Aircraft fittings and non-critical structural parts
4. Industrial Equipment
Machinery parts
Mold bases and tooling plates
5. Construction and Architecture
Curtain walls
Decorative panels
Aluminum frameworks
Comparison with Other Alloys
| Alloy | Strength | Corrosion Resistance | Application Focus |
|---|---|---|---|
| 3003 | Low | Excellent | General purpose |
| 5052 | Medium | Excellent (marine) | Marine |
| 6061 | Medium–High | Good | Structural |
| 7075 | Very High | Moderate | Aerospace |
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