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850.0 (850.0-T5, A08500, formerly 750.0) Cast Aluminum

850.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the T5 temper. To achieve this temper, the metal is artificially aged until it meets standard mechanical property requirements. 850.0 is the Aluminum Association (AA) designation for this material. A08500 is the UNS number. Older literature may refer to this material as 750.0, but this is now discouraged.

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

The graph bars on the material properties cards below compare 850.0 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

45

Elastic (Young's, Tensile) Modulus

69 GPa 10 x 106 psi

Elongation at Break

7.9 %

Fatigue Strength

59 MPa 8.5 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

100 MPa 14 x 103 psi

Tensile Strength: Ultimate (UTS)

140 MPa 20 x 103 psi

Tensile Strength: Yield (Proof)

76 MPa 11 x 103 psi

Thermal Properties

Latent Heat of Fusion

380 J/g

Maximum Temperature: Mechanical

190 °C 370 °F

Melting Completion (Liquidus)

650 °C 1200 °F

Melting Onset (Solidus)

370 °C 690 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

850 J/kg-K 0.2 BTU/lb-°F

Thermal Conductivity

180 W/m-K 110 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

47 % IACS

Electrical Conductivity: Equal Weight (Specific)

140 % IACS

Otherwise Unclassified Properties

Base Metal Price

14 % relative

Density

3.1 g/cm3 190 lb/ft3

Embodied Carbon

8.5 kg CO2/kg material

Embodied Energy

160 MJ/kg 67 x 103 BTU/lb

Embodied Water

1160 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

9.1 MJ/m3

Resilience: Unit (Modulus of Resilience)

42 kJ/m3

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

44 points

Strength to Weight: Axial

12 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

69 mm2/s

Thermal Shock Resistance

6.1 points

Alloy Composition

Among cast aluminum alloys, the composition of 850.0 aluminum is notable for including tin (Sn). Tin is used to increase bearing properties at the cost of a decrease in corrosion resistance.

Aluminum (Al) 88.3 to 93.1
Tin (Sn) 5.5 to 7.0
Nickel (Ni) 0.7 to 1.3
Copper (Cu) 0.7 to 1.3
Silicon (Si) 0 to 0.7
Iron (Fe) 0 to 0.7
Titanium (Ti) 0 to 0.2
Manganese (Mn) 0 to 0.1
Magnesium (Mg) 0 to 0.1
Residuals 0 to 0.3

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

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