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EN AC-46400 (AISi9Cu1Mg) Cast Aluminum

EN AC-46400 aluminum is an aluminum alloy formulated for casting. 46400 is the EN numeric designation for this material. AISi9Cu1Mg is the EN chemical designation.

The properties of EN AC-46400 aluminum include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN AC-46400 aluminum to: Euronorm (EN) cast aluminums (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

77 to 120

Elastic (Young's, Tensile) Modulus

72 GPa 10 x 106 psi

Elongation at Break

1.1 to 1.7 %

Fatigue Strength

75 to 85 MPa 11 to 12 x 103 psi

Poisson's Ratio


Shear Modulus

27 GPa 3.9 x 106 psi

Tensile Strength: Ultimate (UTS)

170 to 310 MPa 25 to 45 x 103 psi

Tensile Strength: Yield (Proof)

110 to 270 MPa 16 to 39 x 103 psi

Thermal Properties

Latent Heat of Fusion

520 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

610 °C 1120 °F

Melting Onset (Solidus)

570 °C 1060 °F

Specific Heat Capacity

890 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

130 W/m-K 75 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

33 % IACS

Electrical Conductivity: Equal Weight (Specific)

110 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative


2.7 g/cm3 170 lb/ft3

Embodied Carbon

7.8 kg CO2/kg material

Embodied Energy

150 MJ/kg 62 x 103 BTU/lb

Embodied Water

1070 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

1.7 to 4.9 MJ/m3

Resilience: Unit (Modulus of Resilience)

82 to 500 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

52 points

Strength to Weight: Axial

18 to 32 points

Strength to Weight: Bending

26 to 38 points

Thermal Diffusivity

55 mm2/s

Thermal Shock Resistance

7.8 to 14 points

Alloy Composition

Among cast aluminum alloys, the composition of EN AC-46400 aluminum is notable for including lead (Pb) and tin (Sn). Lead is used to improve machinability at the cost of toxicity and a decrease in weldability. Tin is used to increase bearing properties at the cost of a decrease in corrosion resistance.

Aluminum (Al)Al 85.4 to 90.5
Silicon (Si)Si 8.3 to 9.7
Copper (Cu)Cu 0.8 to 1.3
Magnesium (Mg)Mg 0.25 to 0.65
Iron (Fe)Fe 0 to 0.8
Zinc (Zn)Zn 0 to 0.8
Manganese (Mn)Mn 0.15 to 0.55
Nickel (Ni)Ni 0 to 0.2
Titanium (Ti)Ti 0 to 0.2
Tin (Sn)Sn 0 to 0.1
Lead (Pb)Pb 0 to 0.1
Residualsres. 0 to 0.25

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

Followup Questions

Similar Alloys

Further Reading

EN 1706: Aluminium and aluminium alloys. Castings. Chemical composition and mechanical properties

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015