Data Sheets

Aluminium Alloy   |   Commercial Alloy

5251 - H24 Sheet and Plate

Commercial5251 EN5251

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.

Applications
5251 is typically used in:
~ Boats
~ Panelling and pressings
~ Marine structures
~ Aircraft parts
~ Vehicle panels
~ Furniture tubing
~ Silos
~ Containers

Mechanical Properties shown are for H24 condition - Mechanical properties for other tempers are shown on page 2.


Chemical Composition

BS EN 573-3:2009
Alloy 5251
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Copper (Cu) 0.15 max
Zinc (Zn) 0.15 max
Chromium (Cr) 0.15 max
Titanium (Ti) 0.15 max
Others (Total) 0.15 max
Silicon (Si) 0.4 max
Manganese (Mn) 0.1 - 0.5
Iron (Fe) 0.5 max
Magnesium (Mg) 1.7 - 2.4

Alloy Designations

Alloy 5251  corresponds to the following standard designations and specifications but may not be a direct equivalent:

 

Al Mg2

Al 2.0Mg 0.3Mn

 


Temper Types

The most common tempers for 5252 aluminium are:

  • H24
  • H26
  • O
  • H22

Supplied Forms

  • Plate
  • Sheet

Generic Physical Properties

Physical Property Value
Density 2.69 g/cm³
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

Mechanical Properties

BS EN 485-2:2008
Sheet & Plate - 0.2mm to 12.5mm
Mechanical Property Value
Proof Stress 140 Min MPa
Tensile Strength 210 - 250 MPa
Hardness Brinell 62 HB

Properties above are for material in the H24 condition


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.

 

Weldability – Gas: Very Good

Weldability – Arc: Very Good

Weldability – Resistance: Very Good

Brazability: Poor

Fabrication

Workability – Cold: Very Good

Machinability: Average