EN CC755S (CuZn39Pb1AIB-C) Leaded Brass
CC755S brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC755S is the EN numeric designation for this material. CuZn39Pb1AIB-C is the EN chemical designation.
It has a fairly low base cost among cast brasses. In addition, it has a very low melting temperature and a moderately high thermal conductivity.
The graph bars on the material properties cards below compare CC755S 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
110
Elastic (Young's, Tensile) Modulus
100 GPa 15 x 106 psi
Elongation at Break
9.5 %
Poisson's Ratio
0.31
Shear Modulus
40 GPa 5.7 x 106 psi
Tensile Strength: Ultimate (UTS)
390 MPa 57 x 103 psi
Tensile Strength: Yield (Proof)
250 MPa 36 x 103 psi
Thermal Properties
Latent Heat of Fusion
170 J/g
Maximum Temperature: Mechanical
120 °C 250 °F
Melting Completion (Liquidus)
820 °C 1510 °F
Melting Onset (Solidus)
780 °C 1440 °F
Specific Heat Capacity
390 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
120 W/m-K 68 BTU/h-ft-°F
Thermal Expansion
21 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
27 % IACS
Electrical Conductivity: Equal Weight (Specific)
30 % IACS
Otherwise Unclassified Properties
Base Metal Price
23 % relative
Density
8.1 g/cm3 500 lb/ft3
Embodied Carbon
2.7 kg CO2/kg material
Embodied Energy
46 MJ/kg 20 x 103 BTU/lb
Embodied Water
330 L/kg 39 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
33 MJ/m3
Resilience: Unit (Modulus of Resilience)
290 kJ/m3
Stiffness to Weight: Axial
7.1 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
14 points
Strength to Weight: Bending
15 points
Thermal Diffusivity
38 mm2/s
Thermal Shock Resistance
13 points
Alloy Composition
Among cast copper alloys, the composition of CC755S brass is notable for containing a comparatively high amount of lead (Pb) and including manganese (Mn). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings. Manganese is used to improve strength without a proportional reduction in ductility.
| Cu | 59.5 to 61 | |
| Zn | 35.8 to 38.9 | |
| Pb | 1.2 to 1.7 | |
| Al | 0.4 to 0.7 | |
| Sn | 0 to 0.3 | |
| Fe | 0.050 to 0.2 | |
| Ni | 0 to 0.2 | |
| Mn | 0 to 0.050 | |
| Si | 0 to 0.050 |
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