B443.0 (B443.0-F, S5A, A24430) Cast Aluminum
B443.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. B443.0 is the Aluminum Association (AA) designation for this material. A24430 is the UNS number. Older literature may refer to this material as ASTM S5A, but this is now discouraged.
The graph bars on the material properties cards below compare B443.0 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
43
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
4.9 %
Fatigue Strength
55 MPa 8.0 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
110 MPa 16 x 103 psi
Tensile Strength: Ultimate (UTS)
150 MPa 21 x 103 psi
Tensile Strength: Yield (Proof)
50 MPa 7.2 x 103 psi
Thermal Properties
Latent Heat of Fusion
470 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
620 °C 1150 °F
Melting Onset (Solidus)
600 °C 1120 °F
Solidification (Pattern Maker's) Shrinkage
1.3 %
Specific Heat Capacity
900 J/kg-K 0.22 BTU/lb-°F
Thermal Conductivity
150 W/m-K 84 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
1130 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
5.6 MJ/m3
Resilience: Unit (Modulus of Resilience)
18 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
52 points
Strength to Weight: Axial
15 points
Strength to Weight: Bending
23 points
Thermal Diffusivity
61 mm2/s
Thermal Shock Resistance
6.8 points
Alloy Composition
Among cast aluminum alloys, the composition of B443.0 aluminum is notable for containing a comparatively high amount of silicon (Si). Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect.
| Al | 91.9 to 95.5 | |
| Si | 4.5 to 6.0 | |
| Fe | 0 to 0.8 | |
| Mn | 0 to 0.35 | |
| Zn | 0 to 0.35 | |
| Ti | 0 to 0.25 | |
| Cu | 0 to 0.15 | |
| Mg | 0 to 0.050 | |
| res. | 0 to 0.15 |
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
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993