UNS C68300 Antimony-Silicon Brass
C68300 brass is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the M30 (as hot extruded) condition. The graph bars on the material properties cards below compare C68300 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
100 GPa 15 x 106 psi
Elongation at Break
15 %
Poisson's Ratio
0.31
Rockwell B Hardness
60
Shear Modulus
40 GPa 5.8 x 106 psi
Shear Strength
260 MPa 38 x 103 psi
Tensile Strength: Ultimate (UTS)
430 MPa 62 x 103 psi
Tensile Strength: Yield (Proof)
260 MPa 38 x 103 psi
Thermal Properties
Latent Heat of Fusion
180 J/g
Maximum Temperature: Mechanical
120 °C 250 °F
Melting Completion (Liquidus)
900 °C 1660 °F
Melting Onset (Solidus)
890 °C 1630 °F
Specific Heat Capacity
390 J/kg-K 0.093 BTU/lb-°F
Thermal Conductivity
120 W/m-K 68 BTU/h-ft-°F
Thermal Expansion
20 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
23 % relative
Density
8.0 g/cm3 500 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
46 MJ/kg 20 x 103 BTU/lb
Embodied Water
340 L/kg 41 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
56 MJ/m3
Resilience: Unit (Modulus of Resilience)
330 kJ/m3
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
15 points
Strength to Weight: Bending
16 points
Thermal Diffusivity
38 mm2/s
Thermal Shock Resistance
14 points
Alloy Composition
Among wrought copper alloys, the composition of C68300 brass is notable for including cadmium (Cd) and antimony (Sb). Cadmium is used to improve strength at elevated temperatures. Antimony is used to improve certain types of corrosion resistance.
| Cu | 59 to 63 | |
| Zn | 34.2 to 40.4 | |
| Si | 0.3 to 1.0 | |
| Sb | 0.3 to 1.0 | |
| Sn | 0.050 to 0.2 | |
| Pb | 0 to 0.090 | |
| Cd | 0 to 0.010 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.