An alloyed non-heat treatable rolled aluminium sheet designed for general sheet metal work where higher mechanical properties are required together with a degree of formability. Internationally recognised grade EN AW 5251 H22 – AlMg2 hardened to the quarter-hard temper. The previous BS specification was known as NS4 H3. Toros range of 5251 will meet all appropriate national / international standards.
Alloy 5251 is typically used for:
Alloy 5251
Spec: weight %
| Chemical Element | % Present |
|---|---|
| Silicon (Si) | 0.0 - 0.40 |
| Iron (Fe) | 0.0 - 0.50 |
| Copper (Cu) | 0.0 - 0.15 |
| Manganese (Mn) | 0.10 - 0.50 |
| Magnesium (Mg) | 1.70 - 2.40 |
| Chromium (Cr) | 0.0 - 0.15 |
| Zinc (Zn) | 0.0 - 0.15 |
| Titanium (Ti) | 0.0 - 0.15 |
| Others (Each) | 0.0 - 0.03 |
| Others (Total) | 0.0 - 0.15 |
| Aluminium (Al) | Balance (REM) |
Alloy 5251
| Property | Value |
|---|---|
| Thermal Conductivity | 149 W/m·K |
| Electrical Conductivity | 39.4% IACS |
| Coefficient of Thermal Expansion | 23.5 x 10⁻⁶ / K |
| Modulus of Elasticity | 70,000 MPa (70 GPa) |
Condition: Typical Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 200 - 240 MPa |
| Yield Strength (Rp0.2) | Min 130 MPa (approx. only) |
| Shear Strength | 125 MPa |
| Elongation | 4 - 8 % (A50) |
| Brinell Hardness | 60 HB |
5251 is easily welded by MIG or TIG processes, with a recommended filler metal of 5056A or 5154A for welding to 5251 structures. A good weld is likely to have strength of up to 160Mpa maximum, although this will be dependent on the type and quality of welding.
