Spring-Tempered (H08) C21000 Brass
H08 C21000 brass is C21000 brass in the H08 (spring) temper. It has the second highest strength and second lowest ductility compared to the other variants of C21000 brass. The graph bars on the material properties cards below compare H08 C21000 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 17 x 106 psi
Elongation at Break
4.0 %
Poisson's Ratio
0.34
Rockwell B Hardness
72
Rockwell Superficial 30T Hardness
67
Shear Modulus
43 GPa 6.2 x 106 psi
Shear Strength
280 MPa 40 x 103 psi
Tensile Strength: Ultimate (UTS)
440 MPa 64 x 103 psi
Tensile Strength: Yield (Proof)
400 MPa 58 x 103 psi
Thermal Properties
Latent Heat of Fusion
200 J/g
Maximum Temperature: Mechanical
190 °C 370 °F
Melting Completion (Liquidus)
1070 °C 1950 °F
Melting Onset (Solidus)
1050 °C 1920 °F
Specific Heat Capacity
390 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
230 W/m-K 140 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
56 % IACS
Electrical Conductivity: Equal Weight (Specific)
57 % IACS
Otherwise Unclassified Properties
Base Metal Price
30 % relative
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
2.6 kg CO2/kg material
Embodied Energy
42 MJ/kg 18 x 103 BTU/lb
Embodied Water
310 L/kg 37 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
17 MJ/m3
Resilience: Unit (Modulus of Resilience)
700 kJ/m3
Stiffness to Weight: Axial
7.2 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
14 points
Strength to Weight: Bending
15 points
Thermal Diffusivity
69 mm2/s
Thermal Shock Resistance
15 points
Alloy Composition
| Cu | 94 to 96 | |
| Zn | 3.7 to 6.0 | |
| Fe | 0 to 0.050 | |
| Pb | 0 to 0.030 | |
| res. | 0 to 0.2 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B134: Standard Specification for Brass Wire
ASTM B36: Standard Specification for Brass Plate, Sheet, Strip, And Rolled Bar
Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993