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C355.0 (SC51B, A33550) Cast Aluminum

C355.0 aluminum is an aluminum alloy formulated for casting. C355.0 is the Aluminum Association (AA) designation for this material. 335 is the SAE designation. And A33550 is the UNS number. Older literature may refer to this material as ASTM SC51B, but this is now discouraged.

This material originally entered the market in 1955.

The properties of C355.0 aluminum include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C355.0 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

86 to 90

Elastic (Young's, Tensile) Modulus

70 GPa 10 x 106 psi

Elongation at Break

2.7 to 3.8 %

Fatigue Strength

76 to 84 MPa 11 to 12 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

290 to 310 MPa 42 to 44 x 103 psi

Tensile Strength: Yield (Proof)

200 to 230 MPa 29 to 34 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)

570 °C 1050 °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 84 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

39 % 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)

7.5 to 9.8 MJ/m3

Resilience: Unit (Modulus of Resilience)

290 to 380 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

51 points

Strength to Weight: Axial

30 to 32 points

Strength to Weight: Bending

36 to 37 points

Thermal Diffusivity

60 mm2/s

Thermal Shock Resistance

13 to 14 points

Alloy Composition

Among cast aluminum alloys, the composition of C355.0 aluminum is notable for containing comparatively high amounts of copper (Cu) and silicon (Si). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability. Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect.

Aluminum (Al) 91.7 to 94.1
Silicon (Si) 4.5 to 5.5
Copper (Cu) 1.0 to 1.5
Magnesium (Mg) 0.4 to 0.6
Iron (Fe) 0 to 0.2
Titanium (Ti) 0 to 0.2
Manganese (Mn) 0 to 0.1
Zinc (Zn) 0 to 0.1
Residuals 0 to 0.15

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

Followup Questions

Similar Alloys

Further Reading

ASTM B686: Standard Specification for Aluminum Alloy Castings, High-Strength

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

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

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993