Spring-Tempered (H08) C68800 Brass
H08 C68800 brass is C68800 brass in the H08 (spring) temper. It has the second highest strength compared to the other variants of C68800 brass. The graph bars on the material properties cards below compare H08 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
2.0 %
Fatigue Strength
260 MPa 37 x 103 psi
Poisson's Ratio
0.32
Rockwell B Hardness
98
Rockwell Superficial 30T Hardness
83
Shear Modulus
41 GPa 5.9 x 106 psi
Shear Strength
480 MPa 70 x 103 psi
Tensile Strength: Ultimate (UTS)
840 MPa 120 x 103 psi
Tensile Strength: Yield (Proof)
760 MPa 110 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)
16 MJ/m3
Resilience: Unit (Modulus of Resilience)
2670 kJ/m3
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
29 points
Strength to Weight: Bending
24 points
Thermal Diffusivity
12 mm2/s
Thermal Shock Resistance
29 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