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.
Alloy 5251 corresponds to the following standard designations and specifications, although may not be a direct equivalent:
Al 2.0Mg 0.3Mn
The most common tempers for 5251 aluminium are:
- H24 - Work hardened by rolling then annealed to half hard
- H26 - Work hardened by rolling then annealed to three-quarter hard
- O - Soft
- H22 - Work hardened by rolling then annealed to quarter hard
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