Menu (ESC)

EN AC-45300 (AlSi5Cu1Mg) Cast Aluminum

EN AC-45300 aluminum is an aluminum alloy formulated for casting. 45300 is the EN numeric designation for this material. AlSi5Cu1Mg is the EN chemical designation. It has a moderately high thermal conductivity and a moderately high electrical conductivity among Euronorm (EN) cast aluminums.

The properties of EN AC-45300 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-45300 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

94 to 120

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

1.0 to 2.8 %

Fatigue Strength

59 to 72 MPa 8.6 to 11 x 103 psi

Poisson's Ratio


Shear Modulus

27 GPa 3.9 x 106 psi

Tensile Strength: Ultimate (UTS)

220 to 290 MPa 32 to 41 x 103 psi

Tensile Strength: Yield (Proof)

150 to 230 MPa 21 to 34 x 103 psi

Thermal Properties

Latent Heat of Fusion

470 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

630 °C 1160 °F

Melting Onset (Solidus)

590 °C 1090 °F

Specific Heat Capacity

890 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

150 W/m-K 85 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

36 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative


2.7 g/cm3 170 lb/ft3

Embodied Carbon

8.0 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1120 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.7 to 5.6 MJ/m3

Resilience: Unit (Modulus of Resilience)

160 to 390 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

50 points

Strength to Weight: Axial

23 to 29 points

Strength to Weight: Bending

30 to 35 points

Thermal Diffusivity

60 mm2/s

Thermal Shock Resistance

10 to 13 points

Alloy Composition

Among cast aluminum alloys, the composition of EN AC-45300 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 90.2 to 94.2
Silicon (Si)Si 4.5 to 5.5
Copper (Cu)Cu 1.0 to 1.5
Magnesium (Mg)Mg 0.35 to 0.65
Iron (Fe)Fe 0 to 0.65
Manganese (Mn)Mn 0 to 0.55
Nickel (Ni)Ni 0 to 0.25
Titanium (Ti)Ti 0 to 0.25
Lead (Pb)Pb 0 to 0.15
Zinc (Zn)Zn 0 to 0.15
Tin (Sn)Sn 0 to 0.050
Residualsres. 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

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