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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.

Aluminum (Al) 90.7 to 95.5
Silicon (Si) 4.5 to 6.0
Iron (Fe) 0 to 0.8
Copper (Cu) 0 to 0.6
Manganese (Mn) 0 to 0.5
Zinc (Zn) 0 to 0.5
Chromium (Cr) 0 to 0.25
Titanium (Ti) 0 to 0.25
Magnesium (Mg) 0 to 0.050
Residuals 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