3A21 Aluminum Coil
3A21 Aluminum Alloy: The Manganese-Enhanced Pure Aluminum for Industrial Applications
Premium-Grade Pure Aluminum with Enhanced Strength
3A21 aluminum alloy (equivalent to AA3003) combines 99.0% aluminum purity with 1.0-1.6% manganese content, delivering 20% higher strength than standard 1100 aluminum while maintaining excellent corrosion resistance. This non-heat-treatable alloy achieves 90-145 MPa tensile strength (depending on temper) with 15-28% elongation capacity – making it ideal for forming complex shapes.
Key Advantages:
- Enhanced Strength: 34 MPa yield strength in annealed condition
- Corrosion Resistance: 0.02 mm/year corrosion rate in salt spray tests
- Formability: 25% elongation in O-temper (ASTM B209)
- Cost Efficiency: 15% lower than 5052 alloy
Technical Specifications
1. Chemical Composition (GB/T 3190 Standard)
| Element | Mn | Fe | Si | Cu | Al |
|---|---|---|---|---|---|
| % Range | 1.0-1.6 | ≤0.7 | ≤0.6 | ≤0.20 | ≥99.0 |
Trace elements: Zn≤0.15%, Ti≤0.20%, Others≤0.15% total
2. Mechanical Properties
| Temper | Tensile (MPa) | Yield (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| O | 89.6-110 | 34-50 | 25-28 | 23 |
| H14 | 130-145 | 115-130 | 15-18 | 40 |
Test standards: ASTM E8 (tensile), ISO 6506-1 (hardness)
3. Physical Characteristics
| Parameter | Value | Unit |
|---|---|---|
| Density | 2.71 | g/cm³ |
| Melting Range | 643-675 | °C |
| CTE | 23.1×10⁻⁶ | /°C |
| Thermal Conductivity | 222 | W/m·K |
Custom Manufacturing Options
Available Forms:
- Thickness: 0.2-6mm sheets (±0.05mm tolerance)
- Width: 500-1500mm standard (up to 3000mm custom)
- Length: 2000-8000mm (cut-to-size service)
Surface Treatments:
- Mill finish (standard Ra 0.8-1.6μm)
- Embossed patterns (0.3-1.2mm depth)
- Anodizing (10-25μm thickness)
Processing Services:
- CNC punching (±0.1mm precision)
- Roll forming (for roofing applications)
- TIG welding (ER4043 filler recommended)
Industrial Applications
Chemical Industry:
- Acid storage tanks (3-6mm thickness)
- Pipeline systems
- Chemical processing equipment
Architectural Sector:
- Decorative wall panels
- Ceiling systems
- Architectural trim components
Food Processing:
- Brewery equipment
- Conveyor systems
- Processing machinery
Performance Comparison
| Property | 3A21 | 1100 | 3003 |
|---|---|---|---|
| Tensile (MPa) | 89.6 | 90 | 110 |
| Conductivity | 50% | 59% | 50% |
| Corrosion Resistance | Excellent | Excellent | Excellent |
| Cost Index | 1.0 | 0.95 | 1.1 |
Fabrication Guidelines
Forming Notes:
- Annealing required after 80% cold work
- Minimum bend radius: 1.5T (O-temper)
- Deep draw speed: 8-12 m/min
Welding Parameters:
- Process: GTAW preferred
- Filler: ER4043
- Gas: Pure argon (12-15 CFH)
Quality Assurance
- 100% dimensional inspection
- Spectrometer verification
- Third-party certification available
Certifications: ISO 9001, GB/T 3190, RoHS
Packaging: Wooden crates with edge protection
Lead Time: 10-15 days for standard orders
Why Choose 3A21 Aluminum?
- Balanced Performance: Optimal strength-to-weight ratio
- Superior Workability: Excellent for forming and welding
- Proven Durability: 15+ year service life in industrial environments
- Wide Availability: Multiple tempers and finishes
For architectural applications, specify PVDF coating options (25-30μm available).
Packing And Delivery
