MakeItFrom.com
Menu (ESC)

355.0 (SC51A, A03550) Cast Aluminum

355.0 aluminum is an aluminum alloy formulated for casting. 355.0 is the Aluminum Association (AA) designation for this material. A03550 is the UNS number. Additionally, the SAE designation is 322. The British Standard (BS) designation is LM16. And the AFNOR (French) designation is A-S4UG. Older literature may refer to this material as ASTM SC51A, but this is now discouraged.

This material originally entered the market in 1930.

The properties of 355.0 aluminum include three 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 355.0 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

72 to 83

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

1.5 to 2.6 %

Fatigue Strength

55 to 70 MPa 8.0 to 10 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.9 x 106 psi

Shear Strength

150 to 240 MPa 22 to 35 x 103 psi

Tensile Strength: Ultimate (UTS)

200 to 260 MPa 29 to 38 x 103 psi

Tensile Strength: Yield (Proof)

150 to 190 MPa 21 to 27 x 103 psi

Thermal Properties

Latent Heat of Fusion

470 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

620 °C 1150 °F

Melting Onset (Solidus)

560 °C 1050 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

890 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

150 to 170 W/m-K 85 to 97 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

38 to 43 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 to 140 % 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)

2.7 to 5.9 MJ/m3

Resilience: Unit (Modulus of Resilience)

150 to 250 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

51 points

Strength to Weight: Axial

20 to 27 points

Strength to Weight: Bending

28 to 33 points

Thermal Diffusivity

60 to 69 mm2/s

Thermal Shock Resistance

9.1 to 12 points

Alloy Composition

Among cast aluminum alloys, the composition of 355.0 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) 90.3 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 0.6
Manganese (Mn) 0 to 0.5
Zinc (Zn) 0 to 0.35
Chromium (Cr) 0 to 0.25
Titanium (Ti) 0 to 0.25
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 Bonding Technology and Data, J. D. Minford, 1993

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