C443.0 (C443.0-F, S5C, A34430) Cast Aluminum
C443.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C443.0 is the Aluminum Association (AA) designation for this material. A34430 is the UNS number. Additionally, the SAE designation is 304. Older literature may refer to this material as ASTM S5C, but this is now discouraged.
The graph bars on the material properties cards below compare C443.0 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
65
Elastic (Young's, Tensile) Modulus
71 GPa 10 x 106 psi
Elongation at Break
9.0 %
Fatigue Strength
120 MPa 17 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
27 GPa 3.9 x 106 psi
Shear Strength
130 MPa 19 x 103 psi
Tensile Strength: Ultimate (UTS)
230 MPa 33 x 103 psi
Tensile Strength: Yield (Proof)
100 MPa 15 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)
600 °C 1120 °F
Specific Heat Capacity
900 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
140 W/m-K 82 BTU/h-ft-°F
Thermal Expansion
22 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
37 % IACS
Electrical Conductivity: Equal Weight (Specific)
120 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.7 g/cm3 170 lb/ft3
Embodied Carbon
7.9 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)
17 MJ/m3
Resilience: Unit (Modulus of Resilience)
70 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
51 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
31 points
Thermal Diffusivity
58 mm2/s
Thermal Shock Resistance
10 points
Alloy Composition
Among cast aluminum alloys, the composition of C443.0 aluminum is notable for including tin (Sn). Tin is used to increase bearing properties at the cost of a decrease in corrosion resistance.
| Al | 89.6 to 95.5 | |
| Si | 4.5 to 6.0 | |
| Fe | 0 to 2.0 | |
| Cu | 0 to 0.6 | |
| Ni | 0 to 0.5 | |
| Zn | 0 to 0.5 | |
| Mn | 0 to 0.35 | |
| Sn | 0 to 0.15 | |
| Mg | 0 to 0.1 | |
| res. | 0 to 0.25 |
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