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
Yutwin New Materials specializes in the production of aluminum coils and sheets in a wide range of alloys, grades, and specifications, offering stable quality, flexible customization, and reliable supply to meet the diverse needs of different industries.
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) |
Common Aluminum Surface Treatments
Polishing
Polishing uses mechanical grinding, chemical, or electrochemical methods to improve the smoothness and brightness of aluminum surfaces. Polished aluminum features a high-gloss finish and excellent decorative appearance.
Brushing
Brushing is a surface treatment process that creates fine, directional textures on aluminum using abrasive belts or brushes. The brushed surface provides a refined metallic appearance while helping conceal minor scratches.
Coating
Coating applies a protective coating onto the aluminum surface through powder coating, liquid spraying, or other coating methods. It provides excellent weather resistance, corrosion protection, and a wide range of color options. Coated aluminum offers both decorative appeal and long-term durabilit.
Anodizing
Anodizing is an electrochemical process that forms a dense oxide layer on the aluminum surface, improving corrosion resistance, wear resistance, and surface hardness. The oxide layer can also be colored to achieve various finishes.
Sand Blasting
Sand blasting uses high-speed abrasive particles to impact the aluminum surface, creating a uniform matte texture. This process provides a soft metallic appearance, reduces fingerprint marks, and improves coating adhesion for subsequent finishing processes.
Embossing
Embossing is a process that forms raised or recessed patterns on aluminum surfaces through rolling or stamping. Common patterns include stucco, diamond, and wood grain textures. Embossed aluminum offers excellent decorative effects, scratch resistance, and certain anti-slip properties.
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.
