443.0 (443.0-F, LM18, S5B, A04430) Cast Aluminum
443.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 443.0 is the Aluminum Association (AA) designation for this material. A04430 is the UNS number. Additionally, the SAE designation is 35. Older literature may refer to this material as ASTM S5B, but this is now discouraged.
The graph bars on the material properties cards below compare 443.0 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
41
Elastic (Young's, Tensile) Modulus
71 GPa 10 x 106 psi
Elongation at Break
5.6 %
Fatigue Strength
55 MPa 8.0 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
27 GPa 3.8 x 106 psi
Shear Strength
96 MPa 14 x 103 psi
Tensile Strength: Ultimate (UTS)
150 MPa 22 x 103 psi
Tensile Strength: Yield (Proof)
65 MPa 9.5 x 103 psi
Thermal Properties
Latent Heat of Fusion
470 J/g
Maximum Temperature: Mechanical
180 °C 350 °F
Melting Completion (Liquidus)
630 °C 1170 °F
Melting Onset (Solidus)
580 °C 1080 °F
Solidification (Pattern Maker's) Shrinkage
1.3 %
Specific Heat Capacity
900 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
38 % IACS
Electrical Conductivity: Equal Weight (Specific)
130 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
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)
6.9 MJ/m3
Resilience: Unit (Modulus of Resilience)
30 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
52 points
Strength to Weight: Axial
16 points
Strength to Weight: Bending
23 points
Thermal Diffusivity
61 mm2/s
Thermal Shock Resistance
6.9 points
Alloy Composition
Among cast aluminum alloys, the composition of 443.0 aluminum is notable for including chromium (Cr). Chromium is used to limit grain growth during hot working or heat treatment, which improves ductility and toughness. Chromium also reduces the alloy's susceptibility to stress corrosion cracking. If the alloy is anodized, the presence of chromium will tend to add a yellow tint to the film.
| Al | 90.7 to 95.5 | |
| Si | 4.5 to 6.0 | |
| Fe | 0 to 0.8 | |
| Cu | 0 to 0.6 | |
| Mn | 0 to 0.5 | |
| Zn | 0 to 0.5 | |
| Cr | 0 to 0.25 | |
| Ti | 0 to 0.25 | |
| Mg | 0 to 0.050 | |
| res. | 0 to 0.35 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B618: Standard Specification for Aluminum-Alloy Investment Castings
ASTM B108: Standard Specification for Aluminum-Alloy Permanent Mold Castings
ASTM B26: Standard Specification for Aluminum-Alloy Sand Castings
Handbook of Aluminum vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003
Aluminum: Properties and Physical Metallurgy, John E. Hatch (editor), 1984