EN CC761S (CuZn16Si4-C) Silicon Brass
CC761S brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC761S is the EN numeric designation for this material. CuZn16Si4-C is the EN chemical designation.
It has the lowest thermal conductivity among cast brasses. In addition, it has a very high electrical conductivity and a fairly low ductility.
The graph bars on the material properties cards below compare CC761S brass to: cast 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
Brinell Hardness
150
Elastic (Young's, Tensile) Modulus
110 GPa 16 x 106 psi
Elongation at Break
8.7 %
Poisson's Ratio
0.33
Shear Modulus
42 GPa 6.1 x 106 psi
Tensile Strength: Ultimate (UTS)
540 MPa 78 x 103 psi
Tensile Strength: Yield (Proof)
340 MPa 50 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
960 °C 1760 °F
Melting Onset (Solidus)
910 °C 1670 °F
Specific Heat Capacity
410 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
27 W/m-K 16 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
40 % IACS
Electrical Conductivity: Equal Weight (Specific)
43 % IACS
Otherwise Unclassified Properties
Base Metal Price
27 % relative
Density
8.3 g/cm3 520 lb/ft3
Embodied Carbon
2.7 kg CO2/kg material
Embodied Energy
45 MJ/kg 19 x 103 BTU/lb
Embodied Water
300 L/kg 36 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
41 MJ/m3
Resilience: Unit (Modulus of Resilience)
530 kJ/m3
Stiffness to Weight: Axial
7.4 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
18 points
Strength to Weight: Bending
18 points
Thermal Diffusivity
8.0 mm2/s
Thermal Shock Resistance
19 points
Alloy Composition
Among cast copper alloys, the composition of CC761S brass is notable for containing a comparatively high amount of silicon (Si) and including manganese (Mn). Silicon is used to improve casting fluidity and lower melting temperature. It also raises strength at the expense of ductility. Manganese is used to improve strength without a proportional reduction in ductility.
| Cu | 78 to 83 | |
| Zn | 8.9 to 19 | |
| Si | 3.0 to 5.0 | |
| Ni | 0 to 1.0 | |
| Pb | 0 to 0.8 | |
| Fe | 0 to 0.6 | |
| Sn | 0 to 0.3 | |
| Mn | 0 to 0.2 | |
| Al | 0 to 0.1 | |
| Sb | 0 to 0.050 | |
| P | 0 to 0.030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 1982: Copper and copper alloys - Ingots and castings