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UNS C92500 Nickel-Phosphorus Gear Bronze

C92500 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C92500 is the UNS number for this material. Additionally, the common industry name is 87-11-1-0-1.

It has a fairly high embodied energy among cast bronzes. In addition, it has a moderately high base cost and a moderately low ductility.

The graph bars on the material properties cards below compare C92500 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

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

11 %

Poisson's Ratio

0.34

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

310 MPa 45 x 103 psi

Tensile Strength: Yield (Proof)

190 MPa 27 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

170 °C 330 °F

Melting Completion (Liquidus)

980 °C 1800 °F

Melting Onset (Solidus)

870 °C 1600 °F

Specific Heat Capacity

370 J/kg-K 0.088 BTU/lb-°F

Thermal Conductivity

63 W/m-K 36 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

12 % IACS

Electrical Conductivity: Equal Weight (Specific)

12 % IACS

Otherwise Unclassified Properties

Base Metal Price

35 % relative

Density

8.7 g/cm3 540 lb/ft3

Embodied Carbon

3.7 kg CO2/kg material

Embodied Energy

61 MJ/kg 26 x 103 BTU/lb

Embodied Water

390 L/kg 47 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

30 MJ/m3

Resilience: Unit (Modulus of Resilience)

170 kJ/m3

Stiffness to Weight: Axial

6.8 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

9.8 points

Strength to Weight: Bending

12 points

Thermal Diffusivity

20 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Among cast copper alloys, the composition of C92500 bronze is notable for containing comparatively high amounts of tin (Sn) and lead (Pb). Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media. It also places certain constraints on cast part design, so as to avoid porosity problems. Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings.

Copper (Cu) 85 to 88
Tin (Sn) 10 to 12
Lead (Pb) 1.0 to 1.5
Nickel (Ni) 0.8 to 1.5
Phosphorus (P) 0 to 1.5
Zinc (Zn) 0 to 0.5
Iron (Fe) 0 to 0.3
Antimony (Sb) 0 to 0.25
Sulfur (S) 0 to 0.050
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 0.7

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

Followup Questions

Similar Alloys

Further Reading

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

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