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UNS C92300 Leaded Navy Bronze

C92300 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C92300 is the UNS number for this material. Additionally, the common industry name is 84-8-1-4. Older literature may refer to this material as ASTM Alloy 2B, but this is now discouraged.

It has a fairly high thermal conductivity and a moderately high ductility among cast bronzes.

The graph bars on the material properties cards below compare C92300 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

19 %

Poisson's Ratio

0.34

Shear Modulus

40 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

300 MPa 43 x 103 psi

Tensile Strength: Yield (Proof)

140 MPa 20 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

1000 °C 1830 °F

Melting Onset (Solidus)

850 °C 1570 °F

Specific Heat Capacity

370 J/kg-K 0.089 BTU/lb-°F

Thermal Conductivity

75 W/m-K 43 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

33 % relative

Density

8.7 g/cm3 540 lb/ft3

Embodied Carbon

3.4 kg CO2/kg material

Embodied Energy

56 MJ/kg 24 x 103 BTU/lb

Embodied Water

370 L/kg 45 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

47 MJ/m3

Resilience: Unit (Modulus of Resilience)

86 kJ/m3

Stiffness to Weight: Axial

6.9 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

9.5 points

Strength to Weight: Bending

11 points

Thermal Diffusivity

23 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Among cast copper alloys, the composition of C92300 bronze is notable for containing a comparatively high amount of tin (Sn) and including sulfur (S). 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. Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity.

Copper (Cu) 85 to 89
Tin (Sn) 7.5 to 9.0
Zinc (Zn) 2.5 to 5.0
Phosphorus (P) 0 to 1.5
Lead (Pb) 0.3 to 1.0
Nickel (Ni) 0 to 1.0
Iron (Fe) 0 to 0.25
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 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