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UNS C64700 Nickel-Silicon Bronze

C64700 bronze is a bronze formulated for primary forming into wrought products. Cited properties are appropriate for the TF00 (precipitation hardened) temper. C64700 is the UNS number for this material. Additionally, the EN chemical designation is CuNi2Si.

It has a fairly high thermal conductivity among wrought bronzes. In addition, it has a moderately high electrical conductivity and a moderately low ductility.

The graph bars on the material properties cards below compare C64700 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

9.0 %

Poisson's Ratio

0.34

Shear Modulus

44 GPa 6.3 x 106 psi

Shear Strength

390 MPa 57 x 103 psi

Tensile Strength: Ultimate (UTS)

660 MPa 96 x 103 psi

Tensile Strength: Yield (Proof)

560 MPa 82 x 103 psi

Thermal Properties

Latent Heat of Fusion

220 J/g

Maximum Temperature: Mechanical

200 °C 400 °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

210 W/m-K 120 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

38 % IACS

Electrical Conductivity: Equal Weight (Specific)

38 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative

Density

8.9 g/cm3 550 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

43 MJ/kg 19 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

57 MJ/m3

Resilience: Unit (Modulus of Resilience)

1370 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

21 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

59 mm2/s

Thermal Shock Resistance

24 points

Alloy Composition

Among wrought copper alloys, the composition of C64700 bronze is notable for including silicon (Si) and nickel (Ni). Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy. Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance.

Copper (Cu) 95.8 to 98
Nickel (Ni) 1.6 to 2.2
Silicon (Si) 0.4 to 0.8
Zinc (Zn) 0 to 0.5
Iron (Fe) 0 to 0.1
Lead (Pb) 0 to 0.1
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B411: Standard Specification for Copper-Nickel-Silicon Alloy Rod and Bar

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