3A21 aluminum coil 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.
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) | 1000 – 12000 (Customizable) |
| Surface Finish | Mill Finish, Anodized, Painted |
| Standard | GB/T 3880, ASTM B209, EN AW-3A21 |
Description
Features
- Aluminum–manganese–magnesium alloy (Al–Mn–Mg)
Belongs to the 3xxx-series aluminum alloys, with manganese and magnesium as main alloying elements, offering higher strength than 3xxx-series Al–Mn alloys.
- Medium to high mechanical strength
Stronger than 3003 and 3105, suitable for structural, load-bearing, and automotive body applications.
- Excellent corrosion resistance
Performs well in atmospheric, marine, and industrial environments, ideal for outdoor, automotive, and coastal applications.
- Good formability and workability
Can be rolled, bent, stamped, and deep-drawn, suitable for medium to thin-gauge processing and complex shapes.
- Good thermal and electrical conductivity
Supports heat dissipation and moderate electrical applications.
- Smooth and uniform surface finish
Suitable for anodizing, painting, coating, embossing, or film lamination for both decorative and functional purposes.
- Good weldability
Compatible with TIG, MIG, and spot welding for reliable joints.
- Lightweight material
Low density supports weight reduction while maintaining durability and mechanical performance.
Applications
- Automotive body panels
Widely used in car doors, roofs, hoods, and other vehicle body components due to good strength, corrosion resistance, and lightweight properties.
- Architectural and building applications
Suitable for roofing, wall cladding, ceiling panels, and decorative sheets in both interior and exterior environments.
- Transportation and railway components
Applied in truck panels, train interiors, and other lightweight transport structures where medium-to-high strength and corrosion resistance are required.
- Heat transfer and thermal applications
Used in heat exchangers, cooling fins, and other components requiring effective thermal conductivity.
- Chemical and industrial equipment
Suitable for tanks, containers, covers, and protective panels in mild chemical and industrial environments.
- General fabrication and forming
Ideal for stamping, bending, rolling, and deep-drawing of medium-thickness sheets and structural or decorative components.
