Aluminium, Commercial Alloy
5251 Aluminium O Sheet & Plate
Good formability and higher mechanical properties.
Aluminium alloy 5251 has good formability and is ideal for general sheet metal work where higher mechanical properties are required.
Mechanical properties shown are for O condition.
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Range
PLEASE NOTE
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5251 O Aluminium Related Specifications
| System / Standard | Country / Region | Grade / Designation |
| AA | USA | 5251-O |
| UNS | International | A95251 (5251-O) |
| EN / DIN | Europe | EN AW-5251-O / 3.3525 |
| EN Name | Europe | AlMg2Mn0.3-O |
| GB | China | 5251-O |
| BS | UK | 5251 (N4) O |
| AFNOR | France | A-G2M-O |
Properties
Chemical Composition
Alloy 5251
| Chemical Element | % Present |
| Manganese (Mn) | 0.10 - 0.50 |
| Iron (Fe) | 0.00 - 0.50 |
| Copper (Cu) | 0.00 - 0.15 |
| Magnesium (Mg) | 1.70 - 2.40 |
| Silicon (Si) | 0.00 - 0.40 |
| Zinc (Zn) | 0.00 - 0.15 |
| Chromium (Cr) | 0.00 - 0.15 |
| Titanium (Ti) | 0.00 - 0.15 |
| Other (Each) | 0.00 - 0.05 |
| Others (Total) | 0.00 - 0.15 |
| Aluminium (Al) | Balance |
Mechanical Properties
Sheet and Plate 0.2mm to 50.00mm
| Mechanical Property | Value |
| Proof Stress | 60 Min MPa |
| Tensile Strength | 160 - 200 MPa |
| Hardness Brinell | 44 HB |
General Physical Properties
| Physical Property | Value |
| Density | 2.69 g/cm³ |
| Melting Point | 625 °C |
| Thermal Expansion | 25 x 10-6/K |
| Modulus of Elasticity | 70 GPa |
| Thermal Conductivity | 134 W/m.K |
| Electrical Resistivity | 0.044 x 10-6 Ω .m |
Applications
- Boats
- Panelling and pressings
- Marine structures
- Aircraft parts
- Vehicle panels
- Furniture tubing
- Silos
- Containers
Characteristics
- Work hardening rapidly
- Readily weldable
- High corrosion resistance particularly in marine environments
Additional Information
Fabrication
| Process | Rating |
| Workability - Cold | Very Good |
| Machinability | Average |
Weldability
Aluminium alloy 5251 is a readily weldable alloy.
The recommended filler wire is 5356 when welding alloy 5251 to itself, 6XXX series alloys, 7XXX series alloys and most other 5XXX alloys.
When welding alloy 5251 to 5005, 5020, 1XXX series or 3XXX series alloys, the recommended filler wire is 4043.
| Process | Rating |
| Weldability - Gas | Very Good |
| Weldability - Arc | Very Good |
| Weldability - Resistance | Very Good |
| Brazability | Poor |
