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UNS C81500 Chromium Copper

C81500 copper is a lightly alloyed grade of copper, formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. It has the highest melting temperature among cast coppers. In addition, it has a very high ductility and a moderately high tensile strength.

The graph bars on the material properties cards below compare C81500 copper to: cast coppers (top), all copper 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

110

Elastic (Young's, Tensile) Modulus

120 GPa 17 x 106 psi

Elongation at Break

17 %

Poisson's Ratio

0.34

Shear Modulus

44 GPa 6.3 x 106 psi

Tensile Strength: Ultimate (UTS)

350 MPa 51 x 103 psi

Tensile Strength: Yield (Proof)

280 MPa 40 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1090 °C 1990 °F

Melting Onset (Solidus)

1080 °C 1970 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

320 W/m-K 180 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

82 % IACS

Electrical Conductivity: Equal Weight (Specific)

83 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative

Density

8.9 g/cm3 560 lb/ft3

Embodied Carbon

2.6 kg CO2/kg material

Embodied Energy

41 MJ/kg 18 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

56 MJ/m3

Resilience: Unit (Modulus of Resilience)

330 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

11 points

Strength to Weight: Bending

12 points

Thermal Diffusivity

91 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Among cast copper alloys, the composition of C81500 copper is notable for including chromium (Cr). Chromium additions permits certain types of heat treatment to improve mechanical strength.

Copper (Cu) 97.4 to 99.6
Chromium (Cr) 0.4 to 1.5
Silicon (Si) 0 to 0.15
Iron (Fe) 0 to 0.1
Aluminum (Al) 0 to 0.1
Tin (Sn) 0 to 0.1
Zinc (Zn) 0 to 0.1
Lead (Pb) 0 to 0.020
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015