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

5251 Aluminium sheet Tempering

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

5251 Aluminium sheet 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

5251 Aluminium sheet Welding

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.

5251 Aluminium sheet 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

Aluminium alloy 5251 is known for work hardening rapidly and is readily weldable. It also possesses high corrosion resistance particularly in marine environments.

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 H22 condition - Mechanical properties for other tempers are shown on page 2.

Chemical Composition

Spec: BS EN573-3:2009

Alloy 5251

Chemical Element % Present

  • Manganese (Mn) 0.10 - 0.50
  • Copper (Cu) 0.0 - 0.15
  • Magnesium (Mg) 1.70 - 2.40
  • Silicon (Si) 0.0 - 0.40
  • Zinc (Zn) 0.0 - 0.15
  • Chromium (Cr) 0.0 - 0.15
  • Titanium (Ti) 0.0 - 0.15
  • Other (Each) 0.0 - 0.05
  • Others (Total) 0.0 - 0.15
  • Iron (Fe) 0.0 - 0.50
  • Aluminium (Al) Balance

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