Soft Annealed (O60) C67500 Bronze
O60 C67500 bronze is C67500 bronze in the O60 (soft annealed) temper. It has the lowest strength compared to the other variants of C67500 bronze. The graph bars on the material properties cards below compare O60 C67500 bronze to: wrought 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
23 %
Poisson's Ratio
0.3
Shear Modulus
40 GPa 5.8 x 106 psi
Shear Strength
270 MPa 40 x 103 psi
Tensile Strength: Ultimate (UTS)
430 MPa 63 x 103 psi
Tensile Strength: Yield (Proof)
170 MPa 24 x 103 psi
Thermal Properties
Latent Heat of Fusion
170 J/g
Maximum Temperature: Mechanical
120 °C 250 °F
Melting Completion (Liquidus)
890 °C 1630 °F
Melting Onset (Solidus)
870 °C 1590 °F
Specific Heat Capacity
390 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
110 W/m-K 61 BTU/h-ft-°F
Thermal Expansion
21 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
24 % IACS
Electrical Conductivity: Equal Weight (Specific)
27 % IACS
Otherwise Unclassified Properties
Base Metal Price
23 % relative
Density
8.0 g/cm3 500 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
47 MJ/kg 20 x 103 BTU/lb
Embodied Water
330 L/kg 39 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
79 MJ/m3
Resilience: Unit (Modulus of Resilience)
130 kJ/m3
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
15 points
Strength to Weight: Bending
16 points
Thermal Diffusivity
34 mm2/s
Thermal Shock Resistance
14 points
Alloy Composition
| Cu | 57 to 60 | |
| Zn | 35.1 to 41.7 | |
| Fe | 0.8 to 2.0 | |
| Sn | 0.5 to 1.5 | |
| Mn | 0.050 to 0.5 | |
| Al | 0 to 0.25 | |
| Pb | 0 to 0.2 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B138: Standard Specification for Manganese Bronze Rod, Bar, and Shapes
ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes
ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001