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UNS C64800 Cobalt-Silicon Bronze

C64800 bronze is a bronze formulated for primary forming into wrought products. Cited properties are appropriate for the H04 (full hard) temper. It has the highest electrical conductivity among wrought bronzes. In addition, it has the highest thermal conductivity and a moderately high base cost.

The graph bars on the material properties cards below compare C64800 bronze to: wrought bronzes (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

Elastic (Young's, Tensile) Modulus

120 GPa 17 x 106 psi

Elongation at Break

8.0 %

Poisson's Ratio

0.34

Shear Modulus

44 GPa 6.4 x 106 psi

Shear Strength

380 MPa 55 x 103 psi

Tensile Strength: Ultimate (UTS)

640 MPa 94 x 103 psi

Tensile Strength: Yield (Proof)

630 MPa 91 x 103 psi

Thermal Properties

Latent Heat of Fusion

220 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1090 °C 1990 °F

Melting Onset (Solidus)

1030 °C 1890 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

260 W/m-K 150 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

65 % IACS

Electrical Conductivity: Equal Weight (Specific)

66 % IACS

Otherwise Unclassified Properties

Base Metal Price

33 % relative

Density

8.9 g/cm3 550 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

43 MJ/kg 18 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

51 MJ/m3

Resilience: Unit (Modulus of Resilience)

1680 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

75 mm2/s

Thermal Shock Resistance

23 points

Alloy Composition

Among wrought copper alloys, the composition of C64800 bronze is notable for including chromium (Cr) and cobalt (Co). Chromium additions permits certain types of heat treatment to improve mechanical strength. Cobalt is used to improve strength.

Copper (Cu) 92.4 to 98.8
Cobalt (Co) 1.0 to 3.0
Silicon (Si) 0.2 to 1.0
Iron (Fe) 0 to 1.0
Phosphorus (P) 0 to 0.5
Nickel (Ni) 0 to 0.5
Tin (Sn) 0 to 0.5
Zinc (Zn) 0 to 0.5
Chromium (Cr) 0 to 0.090
Lead (Pb) 0 to 0.050
Residuals 0 to 0.5

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

Followup Questions

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