7A04 aluminum coil 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.
Description
Features
- High Mechanical Strength
Provides excellent tensile and yield strength after heat treatment, suitable for structural and load-bearing components.
- Good Fatigue Resistance
Maintains stable performance under repeated loading, ideal for transportation and aerospace structures.
- Better Weldability than Cu-Containing 7xxx Alloys
Lower copper content improves weldability compared with 7A09 and 7075.
- Good Corrosion Resistance
Performs reliably in industrial and outdoor environments with appropriate surface treatment.
- Good Machinability
Supports precision machining for high-strength parts.
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) |
Applications
- Aerospace and aviation components
Widely used in aircraft fuselage, wings, and structural components due to very high strength and excellent fatigue resistance.
- Military and defense applications
Suitable for armored vehicles, military aircraft, and other high-strength defense structures.
- Transportation and automotive parts
Applied in high-load structural parts of trucks, buses, and high-performance vehicles where strength-to-weight ratio is critical.
- Structural engineering
Used for bridges, cranes, and other load-bearing structures requiring high mechanical strength and lightweight material.
- Marine applications
Suitable for ship and boat structures where corrosion resistance and high strength are required.
- General fabrication and forming
Ideal for rolling, stamping, bending, and extrusion of medium-to-thin gauge sheets for structural or functional purposes.
