Soft Annealed (O60) C51900 Bronze
O60 C51900 bronze is C51900 bronze in the O60 (soft annealed) temper. It has the lowest strength compared to the other variants of C51900 bronze. The graph bars on the material properties cards below compare O60 C51900 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
110 GPa 16 x 106 psi
Poisson's Ratio
0.34
Rockwell B Hardness
42
Rockwell Superficial 30T Hardness
45
Shear Modulus
42 GPa 6.0 x 106 psi
Tensile Strength: Ultimate (UTS)
380 MPa 55 x 103 psi
Thermal Properties
Latent Heat of Fusion
200 J/g
Maximum Temperature: Mechanical
180 °C 360 °F
Melting Completion (Liquidus)
1040 °C 1900 °F
Melting Onset (Solidus)
930 °C 1700 °F
Specific Heat Capacity
380 J/kg-K 0.090 BTU/lb-°F
Thermal Conductivity
66 W/m-K 38 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
14 % IACS
Electrical Conductivity: Equal Weight (Specific)
14 % IACS
Otherwise Unclassified Properties
Base Metal Price
33 % relative
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
3.2 kg CO2/kg material
Embodied Energy
51 MJ/kg 22 x 103 BTU/lb
Embodied Water
360 L/kg 42 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
55 to 180 MJ/m3
Resilience: Unit (Modulus of Resilience)
680 to 1450 kJ/m3
Stiffness to Weight: Axial
7.0 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
12 points
Strength to Weight: Bending
13 points
Thermal Diffusivity
20 mm2/s
Thermal Shock Resistance
14 points
Alloy Composition
| Cu | 91.7 to 95 | |
| Sn | 5.0 to 7.0 | |
| P | 0.030 to 0.35 | |
| Zn | 0 to 0.3 | |
| Fe | 0 to 0.1 | |
| Pb | 0 to 0.050 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B103: Standard Specification for Phosphor Bronze Plate, Sheet, Strip, and Rolled Bar
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001