5251 - H22 Sheet and Plate
Aluminium alloy 5251 is a medium strength alloy possessing good ductility and therefore good formability. Alloy 5251 is known for work hardening rapidly and is readily weldable. It also possesses high corrosion resistance particularly in marine environments.
5251 is typically used in:
~ Panelling and pressings
~ Marine structures
~ Aircraft parts
~ Vehicle panels
~ Furniture tubing
Mechanical Properties shown are for H22 condition - Mechanical properties for other tempers are shown on page 2.
|Chemical Element||% Present|
|Manganese (Mn)||0.10 - 0.50|
|Copper (Cu)||0.0 - 0.15|
|Magnesium (Mg)||1.70 - 2.40|
|Silicon (Si)||0.0 - 0.40|
|Zinc (Zn)||0.0 - 0.15|
|Chromium (Cr)||0.0 - 0.15|
|Titanium (Ti)||0.0 - 0.15|
|Other (Each)||0.0 - 0.05|
|Others (Total)||0.0 - 0.15|
|Iron (Fe)||0.0 - 0.50|
Alloy 5251 corresponds to the following standard designations and specifications, although may not be a direct equivalent:
Al 2.0Mg 0.3Mn
Generic Physical Properties
|Melting Point||625 °C|
|Thermal Expansion||25 x10^-6 /K|
|Modulus of Elasticity||70 GPa|
|Thermal Conductivity||134 W/m.K|
|Electrical Resistivity||0.044 x10^-6 Ω .m|
BS EN 485-2:2008
Sheet and Plate - 0.2mm to 25mm
|Proof Stress||120 Min MPa|
|Tensile Strength||190 - 230 MPa|
|Hardness Brinell||56 HB|
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.
Weldability – Gas: Very Good
Weldability – Arc: Very Good
Weldability – Resistance: Very Good
Workability – Cold: Very Good
This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.
Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.
The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.
Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.
As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.
Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.