5251 Aluminium

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5251 is a medium strength metal known for its ductility and formability

This grade of Aluminium alloy is best known as a metal that can harden rapidly and is weldable easily.

The 5251 alloy is also poplular because of its high resistance to corrosion, and is commonly used in marine, coastal environments.


You can temper 5251 into many  forms, the most popular forms of 5251 are:

H22 - Work hardened and partially annealed to a quarter hard state                                    

H24 - Work hardened and partially annealed to a half hard state                                       

H26 - Work hardened and partially annealed to a three quarter hard state                         

0 –  Wrought and fully annealed


Chemical Composition


  Cu Mn Si Fe Mg Cr Zn Ti Ai
Min   0.1 0.2   1.7        
Max 0.15 0.5 0.6 0.5 2.4 0.15 0.15 0.15 Balance




Grade 5251 Aluminium alloy is a good wieldable alloy.

When welding this alloy to its self it is recommended that use filler wire is 5356.

Filler wire 5356 is also recommended if you are welding 5251 alloy to an alloy of the 6000 series, 7000 series and the majority of 5000 series.

If you are welding either 5251 to 5005, or 5020 or an alloy of the 1000 series and the 3000 series of alloys then we suggest you us filler wire 4043. 

Mechanical Properties

Grade Tensile Strength (MPa) Proof Stress 0.2% (MPa) Shear Strength (MPa) Hardness Vickers (HV) Elongation A5 (%)
5251 180 80 115 46 26


Physical Properties

Density Melting Point Modulus of Elasticity Electrical Resistivity Thermal Conductivity Thermal Expansion
2.69 g/cm3 625°C 70 GPa 0.044x10-6 Ω.m 134W/m.K 25 x 10-6 /K
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