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295.0 (C4A, A02950) Cast Aluminum

295.0 aluminum is an aluminum alloy formulated for casting. 295.0 is the Aluminum Association (AA) designation for this material. A02950 is the UNS number. Additionally, the SAE designation is 38. And the British Standard (BS) designation is LM11. Older literature may refer to this material as ASTM C4A, but this is now discouraged.

The properties of 295.0 aluminum include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 295.0 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

60 to 93

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

2.0 to 7.2 %

Fatigue Strength

44 to 55 MPa 6.4 to 8.0 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.9 x 106 psi

Shear Strength

180 to 230 MPa 26 to 33 x 103 psi

Tensile Strength: Ultimate (UTS)

230 to 280 MPa 33 to 41 x 103 psi

Tensile Strength: Yield (Proof)

100 to 220 MPa 15 to 32 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

640 °C 1190 °F

Melting Onset (Solidus)

530 °C 990 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

140 W/m-K 82 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

35 % IACS

Electrical Conductivity: Equal Weight (Specific)

100 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

3.0 g/cm3 190 lb/ft3

Embodied Carbon

7.9 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1140 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

5.2 to 13 MJ/m3

Resilience: Unit (Modulus of Resilience)

77 to 340 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

21 to 26 points

Strength to Weight: Bending

27 to 32 points

Thermal Diffusivity

54 mm2/s

Thermal Shock Resistance

9.8 to 12 points

Alloy Composition

Among cast aluminum alloys, the composition of 295.0 aluminum is notable for containing a comparatively high amount of copper (Cu). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.

Aluminum (Al) 91.4 to 95.3
Copper (Cu) 4.0 to 5.0
Silicon (Si) 0.7 to 1.5
Iron (Fe) 0 to 1.0
Manganese (Mn) 0 to 0.35
Zinc (Zn) 0 to 0.35
Titanium (Ti) 0 to 0.25
Magnesium (Mg) 0 to 0.030
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 B26: Standard Specification for Aluminum-Alloy Sand Castings

Iron in Aluminium Alloys: Impurity and Alloying Element, N. A. Belov et al., 2002

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