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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.

Aluminum (Al) 91.9 to 95.5
Silicon (Si) 4.5 to 6.0
Iron (Fe) 0 to 0.8
Manganese (Mn) 0 to 0.35
Zinc (Zn) 0 to 0.35
Titanium (Ti) 0 to 0.25
Copper (Cu) 0 to 0.15
Magnesium (Mg) 0 to 0.050
Residuals 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