Spring-Tempered (H08) C51000 Bronze
H08 C51000 bronze is C51000 bronze in the H08 (spring) temper. It has the highest strength and second lowest ductility compared to the other variants of C51000 bronze. The graph bars on the material properties cards below compare H08 C51000 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
Elongation at Break
5.9 %
Fatigue Strength
150 MPa 22 x 103 psi
Poisson's Ratio
0.34
Rockwell B Hardness
95
Rockwell Superficial 30T Hardness
79
Shear Modulus
42 GPa 6.1 x 106 psi
Shear Strength
460 MPa 66 x 103 psi
Tensile Strength: Ultimate (UTS)
780 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
750 MPa 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
200 J/g
Maximum Temperature: Mechanical
190 °C 370 °F
Melting Completion (Liquidus)
1050 °C 1930 °F
Melting Onset (Solidus)
960 °C 1770 °F
Specific Heat Capacity
380 J/kg-K 0.090 BTU/lb-°F
Thermal Conductivity
77 W/m-K 44 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
18 % IACS
Electrical Conductivity: Equal Weight (Specific)
18 % IACS
Otherwise Unclassified Properties
Base Metal Price
33 % relative
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
3.1 kg CO2/kg material
Embodied Energy
50 MJ/kg 21 x 103 BTU/lb
Embodied Water
350 L/kg 42 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
45 MJ/m3
Resilience: Unit (Modulus of Resilience)
2490 kJ/m3
Stiffness to Weight: Axial
7.0 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
25 points
Strength to Weight: Bending
21 points
Thermal Diffusivity
23 mm2/s
Thermal Shock Resistance
28 points
Alloy Composition
| Cu | 92.9 to 95.5 | |
| Sn | 4.5 to 5.8 | |
| 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 B139: Standard Specification for Phosphor Bronze Rod, Bar, and Shapes
ASTM B103: Standard Specification for Phosphor Bronze Plate, Sheet, Strip, and Rolled Bar
Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001