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333.0 (LM24, SC94A, A03330) Cast Aluminum

333.0 aluminum is an aluminum alloy formulated for casting. 333.0 is the Aluminum Association (AA) designation for this material. LM24 is the British Standard (BS) designation. A03330 is the UNS number. Additionally, the SAE designation is 331. Older literature may refer to this material as ASTM SC94A, but this is now discouraged.

The properties of 333.0 aluminum include four 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 333.0 aluminum to: ANSI/AA 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

90 to 110

Elastic (Young's, Tensile) Modulus

73 GPa 11 x 106 psi

Elongation at Break

1.0 to 2.0 %

Fatigue Strength

83 to 100 MPa 12 to 15 x 103 psi

Poisson's Ratio


Shear Modulus

28 GPa 4.0 x 106 psi

Shear Strength

190 to 230 MPa 27 to 33 x 103 psi

Tensile Strength: Ultimate (UTS)

230 to 280 MPa 33 to 41 x 103 psi

Tensile Strength: Yield (Proof)

130 to 210 MPa 19 to 30 x 103 psi

Thermal Properties

Latent Heat of Fusion

520 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

590 °C 1090 °F

Melting Onset (Solidus)

530 °C 990 °F

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

100 to 140 W/m-K 60 to 82 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

26 to 35 % IACS

Electrical Conductivity: Equal Weight (Specific)

83 to 110 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative


2.8 g/cm3 180 lb/ft3

Embodied Carbon

7.6 kg CO2/kg material

Embodied Energy

140 MJ/kg 61 x 103 BTU/lb

Embodied Water

1040 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.1 to 4.6 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 to 290 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

49 points

Strength to Weight: Axial

22 to 27 points

Strength to Weight: Bending

29 to 34 points

Thermal Diffusivity

42 to 57 mm2/s

Thermal Shock Resistance

11 to 13 points

Alloy Composition

Among cast aluminum alloys, the composition of 333.0 aluminum is notable for containing comparatively high amounts of copper (Cu) and silicon (Si). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability. Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect.

Aluminum (Al)Al 81.8 to 89
Silicon (Si)Si 8.0 to 10
Copper (Cu)Cu 3.0 to 4.0
Iron (Fe)Fe 0 to 1.0
Zinc (Zn)Zn 0 to 1.0
Magnesium (Mg)Mg 0.050 to 0.5
Manganese (Mn)Mn 0 to 0.5
Nickel (Ni)Ni 0 to 0.5
Titanium (Ti)Ti 0 to 0.25
Residualsres. 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B108: Standard Specification for Aluminum-Alloy Permanent Mold Castings

Iron in Aluminium Alloys: Impurity and Alloying Element, N. A. Belov et al., 2002

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