Half-Hard (H02) C68800 Brass
H02 C68800 brass is C68800 brass in the H02 (half hard) temper. It has the second lowest strength and second highest ductility compared to the other variants of C68800 brass. The graph bars on the material properties cards below compare H02 C68800 brass 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 16 x 106 psi
Elongation at Break
20 %
Poisson's Ratio
0.32
Rockwell B Hardness
90
Rockwell Superficial 30T Hardness
78
Shear Modulus
41 GPa 5.9 x 106 psi
Shear Strength
400 MPa 58 x 103 psi
Tensile Strength: Ultimate (UTS)
640 MPa 93 x 103 psi
Tensile Strength: Yield (Proof)
520 MPa 75 x 103 psi
Thermal Properties
Latent Heat of Fusion
190 J/g
Maximum Temperature: Mechanical
160 °C 320 °F
Melting Completion (Liquidus)
960 °C 1770 °F
Melting Onset (Solidus)
950 °C 1740 °F
Specific Heat Capacity
400 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
40 W/m-K 23 BTU/h-ft-°F
Thermal Expansion
19 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
18 % IACS
Electrical Conductivity: Equal Weight (Specific)
20 % IACS
Otherwise Unclassified Properties
Base Metal Price
26 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
48 MJ/kg 21 x 103 BTU/lb
Embodied Water
350 L/kg 42 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
1240 kJ/m3
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
22 points
Strength to Weight: Bending
20 points
Thermal Diffusivity
12 mm2/s
Thermal Shock Resistance
22 points
Alloy Composition
| Cu | 70.8 to 75.5 | |
| Zn | 21.3 to 24.1 | |
| Al | 3.0 to 3.8 | |
| Co | 0.25 to 0.55 | |
| Fe | 0 to 0.2 | |
| 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
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993