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UNS C95520 Nickel-Aluminum Bronze

C95520 bronze is a bronze formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. It has a very high heat capacity among cast bronzes. In addition, it has the highest tensile strength and a very low ductility.

The graph bars on the material properties cards below compare C95520 bronze to: cast 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

Brinell Hardness

280

Elastic (Young's, Tensile) Modulus

120 GPa 17 x 106 psi

Elongation at Break

2.6 %

Poisson's Ratio

0.33

Shear Modulus

44 GPa 6.4 x 106 psi

Tensile Strength: Ultimate (UTS)

970 MPa 140 x 103 psi

Tensile Strength: Yield (Proof)

530 MPa 77 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Maximum Temperature: Mechanical

240 °C 460 °F

Melting Completion (Liquidus)

1070 °C 1960 °F

Melting Onset (Solidus)

1020 °C 1860 °F

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

12 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

3.6 kg CO2/kg material

Embodied Energy

58 MJ/kg 25 x 103 BTU/lb

Embodied Water

390 L/kg 47 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

21 MJ/m3

Resilience: Unit (Modulus of Resilience)

1210 kJ/m3

Stiffness to Weight: Axial

8.0 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

33 points

Strength to Weight: Bending

27 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

33 points

Alloy Composition

Among cast copper alloys, the composition of C95520 bronze is notable for including cobalt (Co) and chromium (Cr). Cobalt is used to improve strength. Chromium additions permits certain types of heat treatment to improve mechanical strength.

Copper (Cu) 74.5 to 81.3
Aluminum (Al) 10.5 to 11.5
Nickel (Ni) 4.2 to 6.0
Iron (Fe) 4.0 to 5.5
Manganese (Mn) 0 to 1.5
Zinc (Zn) 0 to 0.3
Tin (Sn) 0 to 0.25
Cobalt (Co) 0 to 0.2
Silicon (Si) 0 to 0.15
Chromium (Cr) 0 to 0.050
Lead (Pb) 0 to 0.030
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B148: Standard Specification for Aluminum-Bronze Sand Castings

ASTM B271: Standard Specification for Copper-Base Alloy Centrifugal Castings

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

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