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5251 (AlMg2Mn0.3, 3.3525, N4, A95251) Aluminum

5251 aluminum is a 5000-series aluminum alloy: the main alloying addition is magnesium, and it is formulated for primary forming into wrought products. 5251 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-5251. N4 is the British Standard (BS) designation. A95251 is the UNS number. Additionally, the EN chemical designation is AlMg2Mn0,3. And the AFNOR (French) designation is A-G2M.

It originally received its standard designation in 1972.

The properties of 5251 aluminum include 16 common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 5251 aluminum to: 5000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

44 to 79

Elastic (Young's, Tensile) Modulus

68 GPa 9.9 x 106 psi

Elongation at Break

2.0 to 19 %

Fatigue Strength

59 to 110 MPa 8.5 to 17 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.7 x 106 psi

Shear Strength

110 to 160 MPa 16 to 24 x 103 psi

Tensile Strength: Ultimate (UTS)

180 to 280 MPa 26 to 41 x 103 psi

Tensile Strength: Yield (Proof)

67 to 250 MPa 9.7 to 36 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

650 °C 1200 °F

Melting Onset (Solidus)

610 °C 1120 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

150 W/m-K 86 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

37 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

2.7 g/cm3 170 lb/ft3

Embodied Carbon

8.5 kg CO2/kg material

Embodied Energy

150 MJ/kg 66 x 103 BTU/lb

Embodied Water

1180 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

5.4 to 27 MJ/m3

Resilience: Unit (Modulus of Resilience)

33 to 450 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

50 points

Strength to Weight: Axial

18 to 29 points

Strength to Weight: Bending

26 to 35 points

Thermal Diffusivity

61 mm2/s

Thermal Shock Resistance

7.9 to 13 points

Alloy Composition

Among wrought aluminum alloys, the composition of 5251 aluminum is notable for containing a comparatively high amount of magnesium (Mg). Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion.

Aluminum (Al) 95.5 to 98.2
Magnesium (Mg) 1.7 to 2.4
Manganese (Mn) 0.1 to 0.5
Iron (Fe) 0 to 0.5
Silicon (Si) 0 to 0.4
Chromium (Cr) 0 to 0.15
Titanium (Ti) 0 to 0.15
Zinc (Zn) 0 to 0.15
Copper (Cu) 0 to 0.15
Residuals 0 to 0.15

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Handbook of Aluminum vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003

EN 754-2: Aluminium and aluminium alloys. Cold drawn rod/bar and tube. Mechanical properties

EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties

EN 485-2: Aluminium and aluminium alloys. Sheet, strip and plate. Mechanical properties

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993

ISO 6361-2: Wrought aluminium and aluminium alloys - Sheets, strips and plates - Part 2: Mechanical properties

EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products