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UNS C93900 Bearing Bronze

C93900 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C93900 is the UNS number for this material. Additionally, the common industry name is 76-6-16-1.

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

The graph bars on the material properties cards below compare C93900 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

95 GPa 14 x 106 psi

Elongation at Break

5.6 %

Poisson's Ratio

0.36

Shear Modulus

35 GPa 5.1 x 106 psi

Tensile Strength: Ultimate (UTS)

190 MPa 28 x 103 psi

Tensile Strength: Yield (Proof)

130 MPa 18 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

140 °C 280 °F

Melting Completion (Liquidus)

940 °C 1730 °F

Melting Onset (Solidus)

850 °C 1570 °F

Specific Heat Capacity

340 J/kg-K 0.081 BTU/lb-°F

Thermal Conductivity

52 W/m-K 30 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

11 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative

Density

9.1 g/cm3 570 lb/ft3

Embodied Carbon

3.0 kg CO2/kg material

Embodied Energy

49 MJ/kg 21 x 103 BTU/lb

Embodied Water

360 L/kg 43 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

9.5 MJ/m3

Resilience: Unit (Modulus of Resilience)

83 kJ/m3

Stiffness to Weight: Axial

5.8 points

Stiffness to Weight: Bending

17 points

Strength to Weight: Axial

5.9 points

Strength to Weight: Bending

8.1 points

Thermal Diffusivity

17 mm2/s

Thermal Shock Resistance

7.5 points

Alloy Composition

Among cast copper alloys, the composition of C93900 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) 76.5 to 79.5
Lead (Pb) 14 to 18
Tin (Sn) 5.0 to 7.0
Phosphorus (P) 0 to 1.5
Zinc (Zn) 0 to 1.5
Nickel (Ni) 0 to 0.8
Antimony (Sb) 0 to 0.5
Iron (Fe) 0 to 0.4
Sulfur (S) 0 to 0.080
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 1.1

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