Annealed (OS050) C21000 Brass
OS050 C21000 brass is C21000 brass in the OS050 (annealed to 0.050mm grain size) temper. It has the lowest strength and second highest ductility compared to the other variants of C21000 brass. The graph bars on the material properties cards below compare OS050 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
45 %
Poisson's Ratio
0.34
Rockwell F Hardness
46
Shear Modulus
43 GPa 6.2 x 106 psi
Shear Strength
190 MPa 28 x 103 psi
Tensile Strength: Ultimate (UTS)
240 MPa 34 x 103 psi
Tensile Strength: Yield (Proof)
69 MPa 10 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)
81 MJ/m3
Resilience: Unit (Modulus of Resilience)
21 kJ/m3
Stiffness to Weight: Axial
7.2 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
7.4 points
Strength to Weight: Bending
9.6 points
Thermal Diffusivity
69 mm2/s
Thermal Shock Resistance
8.1 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
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