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UNS C94500 Medium Bronze

C94500 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C94500 is the UNS number for this material. Additionally, the common industry name is 73-7-20.

It has the lowest tensile strength among cast bronzes. In addition, it has a very low heat capacity and a very low melting temperature.

The graph bars on the material properties cards below compare C94500 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

50

Elastic (Young's, Tensile) Modulus

92 GPa 13 x 106 psi

Elongation at Break

12 %

Poisson's Ratio

0.36

Shear Modulus

34 GPa 4.9 x 106 psi

Tensile Strength: Ultimate (UTS)

170 MPa 25 x 103 psi

Tensile Strength: Yield (Proof)

83 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

160 J/g

Maximum Temperature: Mechanical

130 °C 260 °F

Melting Completion (Liquidus)

940 °C 1730 °F

Melting Onset (Solidus)

800 °C 1480 °F

Specific Heat Capacity

330 J/kg-K 0.078 BTU/lb-°F

Thermal Conductivity

52 W/m-K 30 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

10 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative

Density

9.3 g/cm3 580 lb/ft3

Embodied Carbon

3.2 kg CO2/kg material

Embodied Energy

51 MJ/kg 22 x 103 BTU/lb

Embodied Water

380 L/kg 46 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

17 MJ/m3

Resilience: Unit (Modulus of Resilience)

37 kJ/m3

Stiffness to Weight: Axial

5.5 points

Stiffness to Weight: Bending

16 points

Strength to Weight: Axial

5.2 points

Strength to Weight: Bending

7.4 points

Thermal Diffusivity

17 mm2/s

Thermal Shock Resistance

6.7 points

Alloy Composition

Among cast copper alloys, the composition of C94500 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) 66.7 to 78
Lead (Pb) 16 to 22
Tin (Sn) 6.0 to 8.0
Zinc (Zn) 0 to 1.2
Nickel (Ni) 0 to 1.0
Antimony (Sb) 0 to 0.8
Iron (Fe) 0 to 0.15
Sulfur (S) 0 to 0.080
Phosphorus (P) 0 to 0.050
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B66: Standard Specification for Bronze Castings for Steam Locomotive Wearing Parts

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