380.0 (380.0-F, SC84B, A03800) Cast Aluminum
380.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 380.0 is the Aluminum Association (AA) designation for this material. A03800 is the UNS number. Older literature may refer to this material as ASTM SC84B, but this is now discouraged.
The graph bars on the material properties cards below compare 380.0 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
80
Elastic (Young's, Tensile) Modulus
74 GPa 11 x 106 psi
Elongation at Break
3.0 %
Fatigue Strength
140 MPa 20 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
28 GPa 4.0 x 106 psi
Shear Strength
190 MPa 28 x 103 psi
Tensile Strength: Ultimate (UTS)
320 MPa 46 x 103 psi
Tensile Strength: Yield (Proof)
160 MPa 23 x 103 psi
Thermal Properties
Latent Heat of Fusion
510 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
590 °C 1090 °F
Melting Onset (Solidus)
540 °C 1010 °F
Specific Heat Capacity
870 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
100 W/m-K 59 BTU/h-ft-°F
Thermal Expansion
22 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
27 % IACS
Electrical Conductivity: Equal Weight (Specific)
83 % IACS
Otherwise Unclassified Properties
Base Metal Price
10 % relative
Density
2.9 g/cm3 180 lb/ft3
Embodied Carbon
7.5 kg CO2/kg material
Embodied Energy
140 MJ/kg 60 x 103 BTU/lb
Embodied Water
1040 L/kg 120 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
8.0 MJ/m3
Resilience: Unit (Modulus of Resilience)
170 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
48 points
Strength to Weight: Axial
31 points
Strength to Weight: Bending
36 points
Thermal Diffusivity
40 mm2/s
Thermal Shock Resistance
14 points
Alloy Composition
Among cast aluminum alloys, the composition of 380.0 aluminum is notable for containing comparatively high amounts of zinc (Zn) and copper (Cu). Zinc is used to achieve significant increases in strength, at the cost of increased susceptibility to stress corrosion cracking. Among other things, this limits weldability. Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.
| Al | 79.6 to 89.5 | |
| Si | 7.5 to 9.5 | |
| Cu | 3.0 to 4.0 | |
| Zn | 0 to 3.0 | |
| Fe | 0 to 2.0 | |
| Mn | 0 to 0.5 | |
| Ni | 0 to 0.5 | |
| Sn | 0 to 0.35 | |
| Mg | 0 to 0.1 | |
| res. | 0 to 0.5 |
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
ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993