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UNS C92800 Leaded Tin Bronze

C92800 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C92800 is the UNS number for this material. Additionally, the common industry name is 76-16-5.

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

The graph bars on the material properties cards below compare C92800 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

100 GPa 14 x 106 psi

Elongation at Break

1.0 %

Poisson's Ratio

0.35

Rockwell B Hardness

80

Shear Modulus

37 GPa 5.4 x 106 psi

Tensile Strength: Ultimate (UTS)

280 MPa 40 x 103 psi

Tensile Strength: Yield (Proof)

210 MPa 30 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

140 °C 290 °F

Melting Completion (Liquidus)

960 °C 1750 °F

Melting Onset (Solidus)

820 °C 1500 °F

Specific Heat Capacity

350 J/kg-K 0.084 BTU/lb-°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

36 % relative

Density

8.7 g/cm3 540 lb/ft3

Embodied Carbon

4.1 kg CO2/kg material

Embodied Energy

67 MJ/kg 29 x 103 BTU/lb

Embodied Water

430 L/kg 52 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.5 MJ/m3

Resilience: Unit (Modulus of Resilience)

210 kJ/m3

Stiffness to Weight: Axial

6.4 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.8 points

Strength to Weight: Bending

11 points

Thermal Shock Resistance

11 points

Alloy Composition

Among cast copper alloys, the composition of C92800 bronze is notable for containing comparatively high amounts of lead (Pb) and tin (Sn). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings. 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.

Copper (Cu) 78 to 82
Tin (Sn) 15 to 17
Lead (Pb) 4.0 to 6.0
Phosphorus (P) 0 to 1.5
Nickel (Ni) 0 to 0.8
Zinc (Zn) 0 to 0.8
Antimony (Sb) 0 to 0.25
Iron (Fe) 0 to 0.2
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

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