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UNS C92600 Leaded Tin Bronze

C92600 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C92600 is the UNS number for this material. Additionally, the common industry name is 87-10-1-2.

It has a very high ductility among cast bronzes. In addition, it has a moderately low electrical conductivity and a moderately low melting temperature.

The graph bars on the material properties cards below compare C92600 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


Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

30 %

Poisson's Ratio


Rockwell F Hardness


Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

300 MPa 44 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 330 °F

Melting Completion (Liquidus)

980 °C 1800 °F

Melting Onset (Solidus)

840 °C 1550 °F

Specific Heat Capacity

370 J/kg-K 0.087 BTU/lb-°F

Thermal Conductivity

67 W/m-K 38 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

34 % relative


8.7 g/cm3 550 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)

74 MJ/m3

Resilience: Unit (Modulus of Resilience)

88 kJ/m3

Stiffness to Weight: Axial

6.8 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

9.6 points

Strength to Weight: Bending

11 points

Thermal Diffusivity

21 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Among cast copper alloys, the composition of C92600 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) 86 to 88.5
Tin (Sn) 9.3 to 10.5
Zinc (Zn) 1.3 to 2.5
Lead (Pb) 0.8 to 1.5
Nickel (Ni) 0 to 0.7
Antimony (Sb) 0 to 0.25
Iron (Fe) 0 to 0.2
Sulfur (S) 0 to 0.050
Phosphorus (P) 0 to 0.030
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

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