MakeItFrom.com
Menu (ESC)

238.0 (238.0-F) Cast Aluminum

238.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 238.0 is the Aluminum Association (AA) designation for this material. Additionally, the UNS number is A02380.

It has the highest density among the ANSI/AA cast aluminums in the database.

The graph bars on the material properties cards below compare 238.0 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

Elastic (Young's, Tensile) Modulus

76 GPa 11 x 106 psi

Elongation at Break

1.5 %

Fatigue Strength

110 MPa 17 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

28 GPa 4.1 x 106 psi

Tensile Strength: Ultimate (UTS)

210 MPa 30 x 103 psi

Tensile Strength: Yield (Proof)

170 MPa 24 x 103 psi

Thermal Properties

Latent Heat of Fusion

430 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

600 °C 1110 °F

Melting Onset (Solidus)

510 °C 950 °F

Specific Heat Capacity

840 J/kg-K 0.2 BTU/lb-°F

Thermal Conductivity

100 W/m-K 60 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

67 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

3.4 g/cm3 210 lb/ft3

Embodied Carbon

7.4 kg CO2/kg material

Embodied Energy

140 MJ/kg 59 x 103 BTU/lb

Embodied Water

1040 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.9 MJ/m3

Resilience: Unit (Modulus of Resilience)

180 kJ/m3

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

42 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

37 mm2/s

Thermal Shock Resistance

9.1 points

Alloy Composition

Among cast aluminum alloys, the composition of 238.0 aluminum is notable for containing comparatively high amounts of copper (Cu) and iron (Fe). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability. Most of the time, iron is an impurity in aluminum alloys. However, it may be added in quantity to improve strength (particularly at high temperatures) without much impact on electrical properties.

Aluminum (Al) 81.9 to 84.9
Copper (Cu) 9.5 to 10.5
Silicon (Si) 3.6 to 4.4
Iron (Fe) 1.0 to 1.5
Zinc (Zn) 1.0 to 1.5
Magnesium (Mg) 0 to 0.25

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993

Aluminum: Properties and Physical Metallurgy, John E. Hatch (editor), 1984

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993