5251

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Grade 5251 is a medium strength non-heat treatable aluminium alloy. With additions of magnesium, iron and manganese the material offers a high corrosion resistance in marine, offshore and industrial environments coupled with a medium strength level.

Grade 5251 is traditionally recognised as a general sheet metal working grade. It is readily weldable and offers higher mechanical properties together with a good cold formability. However, Alloy 5251 is known for work hardening rapidly so care needs to be taken during the forming process.

Chemical Composition

 

Aluminium

Rem

Silicon

0.4% max

Copper

0.15% max

Iron   

0.5% max

Manganese  

0.1–0.5%

Magnesium

1.7-2.4%

Zinc

0.15% max

Titanium

0.15% max

Chromium

0.15% max

Total Others

0.15% max

Related Specifications

5251

Al Mg2

Al 2.0Mg 0.3Mn

NS4

EN AW 5251

 

Key Features

  • Very good cold formability
  • Readily weldable
  • High marine corrosion resistance
  • Good aesthetic properties
  • Very good anodising properties

Typical Physical Properties

Melting Range                                      

595-650°C

Density                                               

2.69 g/cm³

Thermal conductivity                    

155 W/m°K

Thermal expansion coefficient                 

24 x 10-6

Electrical Conductivity                            

36.7 IACS

Electrical resistivity                               

0.047 microhm m

Modulus of elasticity                              

70 GPa

Fabrication Properties

Cold Formability

Very Good

Machinability

Average

Brazing and Soldering

Poor

Inert Gas Welding

Very Good

Resistance Welding   

Very Good

Typical Applications

Grade 5251 has typically been used in boats, panelling and pressings, offshore marine structures aircraft parts, vehicle panels, furniture tubing, silos, containers.

This technical information is given by Holme Dodsworth Metals without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.

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Holme Dodsworth Metals Limited.
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