EN CC751S (CuZn33Pb2Si-C) Leaded Brass
CC751S brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC751S is the EN numeric designation for this material. CuZn33Pb2Si-C is the EN chemical designation.
It has the lowest ductility and a moderately low melting temperature among cast brasses.
The graph bars on the material properties cards below compare CC751S 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
130
Elastic (Young's, Tensile) Modulus
110 GPa 15 x 106 psi
Elongation at Break
5.6 %
Poisson's Ratio
0.31
Shear Modulus
40 GPa 5.8 x 106 psi
Tensile Strength: Ultimate (UTS)
450 MPa 65 x 103 psi
Tensile Strength: Yield (Proof)
320 MPa 46 x 103 psi
Thermal Properties
Latent Heat of Fusion
190 J/g
Maximum Temperature: Mechanical
130 °C 270 °F
Melting Completion (Liquidus)
850 °C 1570 °F
Melting Onset (Solidus)
810 °C 1490 °F
Specific Heat Capacity
390 J/kg-K 0.093 BTU/lb-°F
Thermal Conductivity
110 W/m-K 64 BTU/h-ft-°F
Thermal Expansion
20 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
25 % IACS
Electrical Conductivity: Equal Weight (Specific)
28 % IACS
Otherwise Unclassified Properties
Base Metal Price
24 % relative
Density
8.1 g/cm3 510 lb/ft3
Embodied Carbon
2.8 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)
23 MJ/m3
Resilience: Unit (Modulus of Resilience)
480 kJ/m3
Stiffness to Weight: Axial
7.2 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
15 points
Strength to Weight: Bending
16 points
Thermal Diffusivity
35 mm2/s
Thermal Shock Resistance
15 points
Alloy Composition
Among cast copper alloys, the composition of CC751S 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 | 62.7 to 66 | |
| Zn | 27.9 to 35.6 | |
| Pb | 0.8 to 2.2 | |
| Si | 0.65 to 1.1 | |
| Ni | 0 to 0.8 | |
| Sn | 0 to 0.8 | |
| Fe | 0.25 to 0.5 | |
| Sb | 0 to 0.5 | |
| Mn | 0 to 0.15 | |
| Al | 0 to 0.1 |
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