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EN AC-44400 (44400-F, AISi9) Cast Aluminum

EN AC-44400 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 44400 is the EN numeric designation for this material. AISi9 is the EN chemical designation.

It has a moderately high ductility and a moderately low tensile strength among Euronorm (EN) cast aluminums.

The graph bars on the material properties cards below compare EN AC-44400 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

61

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

4.1 %

Fatigue Strength

79 MPa 12 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.9 x 106 psi

Tensile Strength: Ultimate (UTS)

210 MPa 31 x 103 psi

Tensile Strength: Yield (Proof)

110 MPa 16 x 103 psi

Thermal Properties

Latent Heat of Fusion

540 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

600 °C 1110 °F

Melting Onset (Solidus)

590 °C 1100 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

140 W/m-K 80 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

Density

2.6 g/cm3 160 lb/ft3

Embodied Carbon

7.8 kg CO2/kg material

Embodied Energy

150 MJ/kg 63 x 103 BTU/lb

Embodied Water

1080 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

7.3 MJ/m3

Resilience: Unit (Modulus of Resilience)

85 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

54 points

Strength to Weight: Axial

23 points

Strength to Weight: Bending

31 points

Thermal Diffusivity

60 mm2/s

Thermal Shock Resistance

9.8 points

Alloy Composition

Among cast aluminum alloys, the composition of EN AC-44400 aluminum is notable for including lead (Pb) and containing a comparatively high amount of silicon (Si). Lead is used to improve machinability at the cost of toxicity and a decrease in weldability. Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect.

Aluminum (Al) 87.1 to 92
Silicon (Si) 8.0 to 11
Iron (Fe) 0 to 0.65
Manganese (Mn) 0 to 0.5
Titanium (Ti) 0 to 0.15
Zinc (Zn) 0 to 0.15
Copper (Cu) 0 to 0.1
Magnesium (Mg) 0 to 0.1
Nickel (Ni) 0 to 0.050
Tin (Sn) 0 to 0.050
Lead (Pb) 0 to 0.050
Residuals 0 to 0.15

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

Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993