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 popular 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

O – Wrought and fully annealed

5251 alloy aluminum sheet composition and mechanical properties

Content  (max)0.250.350.

5251 alloy aluminum sheet mechanical properties

  • Tensile strength (σb): 170~305MPa
  • Conditional yield strengthσ0.2 (MPa)≥65
  • Elastic modulus (E): 69.3~70.7Gpa
  • The annealing temperature is: 345°C.

5251 alloy aluminum sheet applications

Circuit Board,Construction , Decoration, Boat

  • Treadplate
  • Boilermaking
  • Containers
  • Nameplates
  • Road Signs
  • Architectural Paneling
  • Welded Tubes
  • Chemical Industry
  • Irrigation
  • Desalination units
  • Pressure Vessels
  • Rivets

Description Aluminium 5251 is an aluminium magnesium manganese alloy which can be hardened by cold work: it is not heat treatable to higher strength. It is about mid way through the series of aluminium magnesium alloys for alloying content and strength, which is very similar to alloy 5052.

Corrosion Resistance 5251 has the same high resistance to general corrosion as other non heat treatable aluminium alloys. It also has the higher resistance to slightly alkaline conditions common to the 5000 series alloys. The resistance of 5251 to corrosion in marine atmospheres is excellent, exceeding that of 5005, hence the frequent use of 5251 in marine applications such as small boats and dinghies.

The corrosion resistance of aluminium alloys relies on a protective surface oxide film, which when damaged is readily repaired by the rapid reaction between aluminium and oxygen. However, the high reactivity of the base metal can give rapid corrosion if the film cannot be repaired, so aluminium alloys are not suitable for use with reducing media. 5251 can be anodised to improve the corrosion resistance by thickening the protective surface film.

5251 aluminium Packing

Packing Details : Standard export package.
Aluminium Sheet of packaging meet the export standard. Plastic film and brown paper can be covered at customers’ need. wooden case or wooden pallet is adopted to protect products from damage during the delivery.
5251 aluminium Packing
5251 aluminium Packing
5251 aluminium Packing
5251 aluminium Packing