3A21 aluminum sheet is an aluminum–manganese alloy in the 3000 series. It is known for its good corrosion resistance, excellent formability, and moderate strength, making it suitable for a variety of applications in construction, transportation, and general engineering. 3A21 is widely used in environments requiring good durability and easy fabrication.
Description
Yutwin New Materials specializes in the production of aluminum sheets and coils 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
- Good Corrosion Resistance
Resistant to atmospheric corrosion, suitable for outdoor and humid environments.
- Moderate Strength
Stronger than 1000 series aluminum, suitable for general structural and decorative applications.
- Excellent Formability
Can be easily bent, rolled, and formed into panels, sheets, and structural components.
- Good Weldability and Fabrication
Supports welding and machining with minimal risk of cracking or distortion.
- Durable and Reliable
Stable mechanical properties under long-term service conditions.
Specifications
| Item | Specification |
|---|---|
| Alloy / Grade | 3A21 |
| Chemical Composition (%) | Al ≥ 96.8, Mn 0.8–1.5, Fe ≤ 0.7, Si ≤ 0.6, Cu ≤ 0.1, Mg ≤ 0.1, Zn ≤ 0.2, Ti ≤ 0.15, Others ≤ 0.05 |
| Series | 3000 Series (Al-Mn Alloy) |
| Temper | O, H14, H16, H18, H19, H22 |
| Thickness (mm) | 0.2 – 250 |
| Width (mm) | 100 – 2650 |
| Length (mm) | 2000 – 6000 |
| Surface Finish | Mill Finish, Anodized, Painted |
| Standard | GB/T 3880, ASTM B209, EN AW-3A21 |
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
- Building panels and roofing.
- Transportation vehicle panels.
- Chemical and storage containers.
- General engineering components.
- Decorative panels and industrial machinery.
