6351 (AlSi1Mg0.5Mn, A96351) Aluminum
6351 aluminum is a 6000-series aluminum alloy: there is significant alloying with both magnesium and silicon, and the alloy is formulated for primary forming into wrought products. 6351 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-6351. A96351 is the UNS number. Additionally, the EN chemical designation is AlSi1Mg0,5Mn.
It originally received its standard designation in 1958.
The properties of 6351 aluminum include nine 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 6351 aluminum to: 6000-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
Elastic (Young's, Tensile) Modulus
69 GPa 10 x 106 psi
Elongation at Break
7.8 to 18 %
Fatigue Strength
79 to 130 MPa 11 to 19 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
84 to 200 MPa 12 to 29 x 103 psi
Tensile Strength: Ultimate (UTS)
140 to 310 MPa 20 to 45 x 103 psi
Tensile Strength: Yield (Proof)
95 to 270 MPa 14 to 39 x 103 psi
Thermal Properties
Latent Heat of Fusion
410 J/g
Maximum Temperature: Mechanical
160 °C 320 °F
Melting Completion (Liquidus)
650 °C 1200 °F
Melting Onset (Solidus)
570 °C 1060 °F
Specific Heat Capacity
900 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
180 W/m-K 100 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
46 % IACS
Electrical Conductivity: Equal Weight (Specific)
150 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.7 g/cm3 170 lb/ft3
Embodied Carbon
8.3 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)
20 to 38 MJ/m3
Resilience: Unit (Modulus of Resilience)
65 to 540 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
50 points
Strength to Weight: Axial
14 to 32 points
Strength to Weight: Bending
22 to 38 points
Thermal Diffusivity
72 mm2/s
Thermal Shock Resistance
6.1 to 14 points
Alloy Composition
Among wrought aluminum alloys, the composition of 6351 aluminum is notable for containing comparatively high amounts of silicon (Si) and manganese (Mn). Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy. Manganese is used to improve strength without a proportional reduction in ductility. It also improves workability by controlling the grain structure of the alloy.
| Al | 96 to 98.5 | |
| Si | 0.7 to 1.3 | |
| Mn | 0.4 to 0.8 | |
| Mg | 0.4 to 0.8 | |
| Fe | 0 to 0.5 | |
| Ti | 0 to 0.2 | |
| Zn | 0 to 0.2 | |
| Cu | 0 to 0.1 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties
Aluminum Standards and Data, Aluminum Association Inc., 2013
EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993