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UNS C93400 Leaded Tin Bronze

C93400 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C93400 is the UNS number for this material. Additionally, the common industry name is 84-8-8.

It has a fairly low heat capacity among cast bronzes. In addition, it has a moderately low ductility and a moderately low tensile strength.

The graph bars on the material properties cards below compare C93400 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 15 x 106 psi

Elongation at Break

9.1 %

Poisson's Ratio

0.35

Shear Modulus

38 GPa 5.5 x 106 psi

Tensile Strength: Ultimate (UTS)

270 MPa 39 x 103 psi

Tensile Strength: Yield (Proof)

150 MPa 22 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

150 °C 310 °F

Melting Completion (Liquidus)

950 °C 1730 °F

Melting Onset (Solidus)

850 °C 1570 °F

Specific Heat Capacity

350 J/kg-K 0.085 BTU/lb-°F

Thermal Conductivity

58 W/m-K 34 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

32 % relative

Density

8.9 g/cm3 560 lb/ft3

Embodied Carbon

3.3 kg CO2/kg material

Embodied Energy

54 MJ/kg 23 x 103 BTU/lb

Embodied Water

380 L/kg 45 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

21 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 kJ/m3

Stiffness to Weight: Axial

6.3 points

Stiffness to Weight: Bending

17 points

Strength to Weight: Axial

8.3 points

Strength to Weight: Bending

10 points

Thermal Diffusivity

18 mm2/s

Thermal Shock Resistance

10 points

Alloy Composition

Among cast copper alloys, the composition of C93400 bronze is notable for containing a comparatively high amount of lead (Pb). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings.

Copper (Cu) 82 to 85
Tin (Sn) 7.0 to 9.0
Lead (Pb) 7.0 to 9.0
Phosphorus (P) 0 to 1.5
Nickel (Ni) 0 to 1.0
Zinc (Zn) 0 to 0.8
Antimony (Sb) 0 to 0.5
Iron (Fe) 0 to 0.2
Sulfur (S) 0 to 0.080
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 1.0

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