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201.0 (CQ51A, A02010) Cast Aluminum

201.0 aluminum is an aluminum alloy formulated for casting. 201.0 is the Aluminum Association (AA) designation for this material. A02010 is the UNS number. Additionally, the SAE designation is 382. Older literature may refer to this material as ASTM CQ51A, but this is now discouraged.

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

The properties of 201.0 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 201.0 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

95 to 140

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

4.4 to 20 %

Fatigue Strength

120 to 150 MPa 18 to 21 x 103 psi

Impact Strength: V-Notched Charpy

10 to 22 J 7.4 to 16 ft-lb

Poisson's Ratio


Shear Modulus

27 GPa 3.9 x 106 psi

Shear Strength

290 MPa 42 x 103 psi

Tensile Strength: Ultimate (UTS)

370 to 470 MPa 53 to 68 x 103 psi

Tensile Strength: Yield (Proof)

220 to 400 MPa 31 to 59 x 103 psi

Thermal Properties

Latent Heat of Fusion

390 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

650 °C 1200 °F

Melting Onset (Solidus)

570 °C 1060 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

870 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

120 W/m-K 70 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

30 to 33 % IACS

Electrical Conductivity: Equal Weight (Specific)

87 to 97 % IACS

Otherwise Unclassified Properties

Base Metal Price

38 % relative

Calomel Potential

-670 mV


3.1 g/cm3 190 lb/ft3

Embodied Carbon

8.7 kg CO2/kg material

Embodied Energy

160 MJ/kg 69 x 103 BTU/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

19 to 63 MJ/m3

Resilience: Unit (Modulus of Resilience)

330 to 1160 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

45 points

Strength to Weight: Axial

33 to 42 points

Strength to Weight: Bending

37 to 44 points

Thermal Diffusivity

45 mm2/s

Thermal Shock Resistance

19 to 25 points

Alloy Composition

Among cast aluminum alloys, the composition of 201.0 aluminum is notable for including silver (Ag) and containing a comparatively high amount of copper (Cu). Silver is used to improve strength and resistance to stress corrosion cracking. Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.

Aluminum (Al)Al 92.1 to 95.1
Copper (Cu)Cu 4.0 to 5.2
Silver (Ag)Ag 0.4 to 1.0
Magnesium (Mg)Mg 0.15 to 0.55
Manganese (Mn)Mn 0.2 to 0.5
Titanium (Ti)Ti 0.15 to 0.35
Iron (Fe)Fe 0 to 0.15
Silicon (Si)Si 0 to 0.1
Residualsres. 0 to 0.1

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

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

Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012

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