Aluminium Alloys - Aluminium 5251 Properties, Fabrication and Applications

Aluminium alloy 5251 is a medium strength alloy possessing good ductility and therefore good formability.

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

Chemical Composition of Aluminium Alloy 5251

Table 1. Chemical composition for aluminium alloy 5251

Element % Present
Cu 0.15
Mg 1.7-2.4
Si 0.4
Fe 0.5
Mn 0.1-0.5
Zn 0.15
Ti 0.15
Cr 0.15
Al Balance

Properties of Aluminium Alloy 5251

Mechanical Properties of Aluminium Alloy 5251

Table 2 (a). Mechanical properties for aluminium alloy 5251 Soft O

BS EN 485-2:2008
Sheet and Plate
0.2mm to 50.00mm
Property Value
Proof Stress 60 Min MPa
Tensile Strength 160 - 200 MPa
Hardness Brinell 44 HB

*Properties above are for material in the Soft O condition


Table 2 (b). Mechanical properties for aluminium alloy 5251 H22

BS EN 485-2:2008
Sheet and Plate
0.2mm to 25mm
Property Value
Proof Stress 120 Min MPa
Tensile Strength 190 - 230 MPa
Hardness Brinell 56 HB

*Properties above are for material in the H22 condition


Table 2 (c). Mechanical properties for aluminium alloy 5251 H24

BS EN 485-2:2008
Sheet & Plate
0.2mm to 12.5mm
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


Table 2 (d). Mechanical properties for aluminium alloy 5251 H26

BS EN 485-2:2008
Sheet and Plate
0.2mm to 4mm
Property Value
Proof Stress 170 Min MPa
Tensile Strength 230 - 270 MPa
Hardness Brinell 69 HB

*Properties above are for material in the H26 condition


Physical Properties of Aluminium Alloy 5251

Table 3. Physical properties for aluminium alloy 5251

Property Value
Density 2.69 g/cm3
Melting Point 625°C
Modulus of Elasticity 70 GPa
Electrical Resistivity 0.044x10-6 Ω.m
Thermal Conductivity 134 W/m.K
Thermal Expansion 25x10-6 /K

Alloy Designations

Aluminium alloy 5251 also corresponds to the following designations:

  • Al Mg2
  • Al 2.0Mg 0.3Mn

Fabrication of Aluminium Alloy 5251

Welding

Aluminium alloy 5251 is a readily weldable alloy.

The recommended filler wire is 5356 when welding Aluminium alloy 5251 to itself, 6XXX series alloys, 7XXX series alloys and most other 5XXX alloys.

When welding alloy Aluminium alloy 5251 to 5005, 5020, 1XXX series or 3XXX series alloys, the recommended filler wire is 4043.

Fabrication Response

Table 4. Fabrication response for aluminium alloy 5251

Process Rating
Workability – Cold Very Good
Machinability Average
Weldability – Gas Very Good
Weldability – Arc Very Good
Weldability – Resistance Very Good
Brazability Poor
Solderability -

Temper

The common tempers for Aluminium alloy 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

Applications of Aluminium Alloy 5251

Aluminium alloy 5251 is used in:

  • Boats
  • Panelling and pressings
  • Marine structures
  • Aircraft parts
  • Vehicle panels
  • Furniture tubing
  • Silos
  • Containers

Supplied Forms

Aalco supplies Aluminium alloy 5251 in a H22 temper in the following forms:

  • Sheet
  • Plate

DISCLAIMER

This Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with temper, product and product dimensions. The information is based on our present knowledge and is given in good faith. However, no liability will be accepted by the Company is respect of any action taken by any third party in reliance thereon.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose.

Any advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the company’s Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.

This information has been sourced, reviewed and adapted from materials provided by Aalco - Ferrous and Non-Ferrous Metals Stockist.

For more information on this source, please visit Aalco - Ferrous and Non-Ferrous Metals Stockist.

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