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390.0 (SC174A, A03900) Cast Aluminum

390.0 aluminum is an aluminum alloy formulated for casting. 390.0 is the Aluminum Association (AA) designation for this material. A03900 is the UNS number. Additionally, the British Standard (BS) designation is LM30. Older literature may refer to this material as ASTM SC174A, but this is now discouraged.

It has a moderately low embodied energy among the ANSI/AA cast aluminums in the database.

The properties of 390.0 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 390.0 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

120

Elastic (Young's, Tensile) Modulus

75 GPa 11 x 106 psi

Elongation at Break

1.0 %

Fatigue Strength

76 to 110 MPa 11 to 16 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

28 GPa 4.1 x 106 psi

Tensile Strength: Ultimate (UTS)

280 to 300 MPa 40 to 43 x 103 psi

Tensile Strength: Yield (Proof)

240 to 270 MPa 35 to 38 x 103 psi

Thermal Properties

Latent Heat of Fusion

640 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

650 °C 1200 °F

Melting Onset (Solidus)

560 °C 1030 °F

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

130 W/m-K 77 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

24 to 25 % IACS

Electrical Conductivity: Equal Weight (Specific)

79 to 83 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

2.7 g/cm3 170 lb/ft3

Embodied Carbon

7.3 kg CO2/kg material

Embodied Energy

130 MJ/kg 58 x 103 BTU/lb

Embodied Water

950 L/kg 110 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.7 to 2.9 MJ/m3

Resilience: Unit (Modulus of Resilience)

380 to 470 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

52 points

Strength to Weight: Axial

28 to 30 points

Strength to Weight: Bending

35 to 36 points

Thermal Diffusivity

56 mm2/s

Thermal Shock Resistance

14 to 15 points

Alloy Composition

Among cast aluminum alloys, the composition of 390.0 aluminum is notable for containing comparatively high amounts of silicon (Si) and copper (Cu). Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect. Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.

Aluminum (Al) 74.5 to 79.6
Silicon (Si) 16 to 18
Copper (Cu) 4.0 to 5.0
Iron (Fe) 0 to 1.3
Magnesium (Mg) 0.45 to 0.65
Titanium (Ti) 0 to 0.2
Manganese (Mn) 0 to 0.1
Zinc (Zn) 0 to 0.1
Residuals 0 to 0.2

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

Followup Questions

Similar Alloys

Further Reading

ASTM B85: Standard Specification for Aluminum-Alloy Die 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