what is 5251 aluminum sheet?

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, and coastal environments.

5251 Alloy Metal Aluminum Sheet Plate

5251 Alloy Metal Aluminum Sheet Plate


Aluminum 5251 is an aluminum-magnesium manganese alloy that can be hardened by cold work: it is not heated and treatable to higher strength. It is about mid-way through the series of aluminum-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 aluminum alloys. It also has a 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 aluminum alloys relies on a protective surface oxide film, which when damaged is readily repaired by the rapid reaction between aluminum and oxygen. However, the high reactivity of the base metal can give rapid corrosion if the film cannot be repaired, so aluminum alloys are not suitable for use with reducing media. 5251 can be anodized to improve the corrosion resistance by thickening the protective surface film.


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 aluminum plate parameters

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 is345°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

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.

Aluminum sheet manufacturers near me

Henan Huawei Aluminum Co., Ltd. is the leader of many aluminum manufactures and suppliers in China. We strictly control the quality and focus on customers. We hope to have in-depth cooperation with you and provide you with high quality aluminum material products custom OEM services. If you want to get the newest and best prices by per kg ( kilogram ) or per ton standard weight, please contact us.

Aluminum Sheet Manufacturers Near Me


Aluminum sheet plate standard export packing

  • The aluminum plate is paperclip or laminated to ensure that the surface of the aluminum plate is intact and free of scratches;
  • Plastic film ( HDPE, PVC, PE or PET etc ) protection or hard kraft paper wrapping is used to prevent moisture and rain to ensure that the aluminum plate is clean and free of dirt during transportation (each package has a moisture-proof desiccant to ensure the quality of our products in East China and South China, where there is more rain);
  • Installed with wooden brackets and reinforced with steel straps to avoid collision during transportation and to ensure the geometry of the aluminum plate remains unchanged;
  • For export products, we use wooden boxes and pallets with fumigation mark for packaging;
  • We can also pack according to other packaging requirements of customers;