Half-Hard and Stress Relieved (HR02) C67400 Bronze
HR02 C67400 bronze is C67400 bronze in the HR02 (half-hard and stress relieved) temper. It has the highest strength and lowest ductility compared to the other variants of C67400 bronze. The graph bars on the material properties cards below compare HR02 C67400 bronze to: wrought brasses (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 15 x 106 psi
Elongation at Break
22 %
Fatigue Strength
200 MPa 29 x 103 psi
Poisson's Ratio
0.31
Rockwell B Hardness
85
Shear Modulus
41 GPa 5.9 x 106 psi
Shear Strength
330 MPa 48 x 103 psi
Tensile Strength: Ultimate (UTS)
610 MPa 89 x 103 psi
Tensile Strength: Yield (Proof)
370 MPa 54 x 103 psi
Thermal Properties
Latent Heat of Fusion
190 J/g
Maximum Temperature: Mechanical
130 °C 260 °F
Melting Completion (Liquidus)
890 °C 1630 °F
Melting Onset (Solidus)
870 °C 1590 °F
Specific Heat Capacity
400 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
100 W/m-K 58 BTU/h-ft-°F
Thermal Expansion
21 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
23 % IACS
Electrical Conductivity: Equal Weight (Specific)
26 % IACS
Otherwise Unclassified Properties
Base Metal Price
23 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
48 MJ/kg 21 x 103 BTU/lb
Embodied Water
330 L/kg 39 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
660 kJ/m3
Stiffness to Weight: Axial
7.5 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
22 points
Strength to Weight: Bending
20 points
Thermal Diffusivity
32 mm2/s
Thermal Shock Resistance
20 points
Alloy Composition
| Cu | 57 to 60 | |
| Zn | 31.1 to 40 | |
| Mn | 2.0 to 3.5 | |
| Al | 0.5 to 2.0 | |
| Si | 0.5 to 1.5 | |
| Pb | 0 to 0.5 | |
| Fe | 0 to 0.35 | |
| Sn | 0 to 0.3 | |
| Ni | 0 to 0.25 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993