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3A21 aluminum sheet manufacturer: Zggdmetal; Thickness: 0.1 – 500 mm; Width: 100 mm – 2650 mm; Laser precision cutting & customized procurement to meet specific needs; Contact us now for more specifications.
3A21 aluminum sheet belongs to the 3000-series aluminum-manganese alloys and is widely recognized as a reliable rust-resistant aluminum material. The primary alloying element, manganese (Mn), enhances both corrosion resistance and formability while maintaining the lightweight advantages of aluminum.
Compared with commercially pure aluminum, 3A21 aluminum sheet provides slightly higher mechanical strength while still offering excellent ductility.Since 3A21 aluminum is a non-heat-treatable alloy, its mechanical properties are mainly improved through cold working processes, such as rolling and strain hardening.
Because of its balanced performance—including durability, corrosion resistance, and easy fabrication—3A21 aluminum sheet is commonly used in industries that require forming, deep drawing, and long-term resistance to humid or corrosive environments.
The manganese content significantly improves resistance to atmospheric, freshwater, and mild chemical corrosion. This allows 3A21 aluminum sheet to maintain stability and durability even in damp or outdoor environments.
In the annealed condition, the alloy has high plasticity and can be easily processed through bending, stamping, spinning, or deep-drawing operations, making it ideal for complex shapes and thin-wall components.
3A21 aluminum alloy sheet supports several common welding techniques, including spot welding, gas welding, and argon arc welding. This ensures strong joints and simplifies fabrication during industrial processing.
Although it is not designed as a high-strength structural alloy, 3A21 aluminum sheet provides adequate strength for many industrial and manufacturing applications while retaining lightweight properties.
Manufactured sheets usually feature a clean and uniform surface with minimal defects such as scratches or dents, supporting high-quality finishing and downstream processing.
| Alloy | 3A21 Aluminum Alloy |
| Series | 3000 Series (Aluminum-Manganese Alloy) |
| Temper | O, H12, H14, H16, H18, H24, H112 |
| Thickness | 0.3 mm – 200 mm |
| Width | Up to 2650 mm |
| Length | Custom length available |
| Processing | Cold rolled / Hot rolled |
| Surface Finish | Mill finish or customized |
| Standard | GB / ASTM / EN standards |
| Al | Balance |
| Mn | 1.0 – 1.6 |
| Si | ≤0.60 |
| Fe | ≤0.70 |
| Cu | ≤0.20 |
| Mg | ≤0.05 |
| Zn | ≤0.10 |
| Ti | ≤0.15 |
| Others | ≤0.05 each |
| Tensile Strength | 120 – 160 MPa |
| Yield Strength | ≥85 MPa |
| Elongation | ≥16 – 20% |
Thanks to its corrosion resistance and excellent formability, 3A21 aluminum sheet is widely used in various industries:
Automotive manufacturing – body panels, heat shields, and interior components (commonly in 3A21 H14 and 3A21 H24 tempers)
Transportation equipment – vehicle parts and lightweight structural components
Construction industry – roofing panels, decorative panels, and building materials
Chemical equipment – storage containers and corrosion-resistant equipment parts
Container manufacturing – fuel tanks, liquid containers, and packaging equipment
General metal fabrication – parts requiring bending, forming, or deep drawing
In terms of alloy composition and performance, 3A21 aluminum sheet is very similar to 3003 aluminum sheet. Both belong to the Al-Mn alloy family and share comparable characteristics,such as
Good corrosion resistance
Excellent workability
Non-heat-treatable strengthening mechanism
However, 3A21 aluminum is commonly used in specific industrial standards and applications where improved rust resistance and stable forming properties are required.
