7A04 aluminum sheet is a high-strength heat-treatable aluminum alloy belonging to the Al-Zn-Mg (7xxx) series. It is characterized by high strength, good fatigue resistance, and excellent performance in load-bearing structures. Compared with 7A09, 7A04 offers slightly lower strength but improved weldability, making it suitable for a wider range of structural and industrial applications.
Specifications
| Item | Specification |
|---|---|
| Alloy / Grade | 7A04 |
| Chemical Composition (%) | Zn 4.0–5.0, Mg 1.8–2.8, Mn 0.2–0.6, Cr ≤ 0.25, Fe ≤ 0.50, Si ≤ 0.40, Cu ≤ 0.10, Ti ≤ 0.10, Al Balance |
| Series | 7000 Series (Al-Zn-Mg) |
| Temper | O, T6, T651 |
| Thickness (mm) | 1.0 – 150 |
| Width (mm) | 100 – 2600 |
| Length (mm) | 1000 – 12000 (Customizable) |
| Surface Finish | Mill Finish, Anodized (Optional) |
| Standard | GB/T 3880, ASTM B209 (Equivalent) |
Description
Features
- Ultra-high mechanical strength
Suitable for aerospace, transportation, and structural applications requiring maximum strength-to-weight ratio.
- Good corrosion resistance
Performs well in atmospheric, marine, and industrial environments; corrosion resistance can be further enhanced by anodizing or coating.
- Limited formability and workability
Can be rolled, bent, stamped, and extruded; forming is more restricted compared to 6xxx-series alloys due to higher strength.
- Smooth and uniform surface finish
Ideal for anodizing, painting, or coating for both decorative and functional purposes.
- Good weldability
Compatible with TIG and MIG welding under proper conditions; post-weld heat treatment recommended for optimal strength.
- Lightweight material
Low density helps reduce overall weight while maintaining structural performance.
Applications
- Aerospace structural components.
- Aircraft frames and ribs.
- Transportation and rail structures.
- High-strength welded structures.
- Industrial machinery and fixtures.
