EN CC490K (CuSn3Zn8Pb5-C) Leaded Brass
CC490K brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC490K is the EN numeric designation for this material. CuSn3Zn8Pb5-C is the EN chemical designation.
It has a fairly high base cost among cast brasses. In addition, it has a moderately low tensile strength and a moderately low electrical conductivity.
The graph bars on the material properties cards below compare CC490K 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
76
Elastic (Young's, Tensile) Modulus
110 GPa 16 x 106 psi
Elongation at Break
15 %
Poisson's Ratio
0.34
Shear Modulus
40 GPa 5.9 x 106 psi
Tensile Strength: Ultimate (UTS)
230 MPa 34 x 103 psi
Tensile Strength: Yield (Proof)
110 MPa 16 x 103 psi
Thermal Properties
Latent Heat of Fusion
190 J/g
Maximum Temperature: Mechanical
160 °C 330 °F
Melting Completion (Liquidus)
980 °C 1790 °F
Melting Onset (Solidus)
910 °C 1680 °F
Specific Heat Capacity
370 J/kg-K 0.089 BTU/lb-°F
Thermal Conductivity
72 W/m-K 42 BTU/h-ft-°F
Thermal Expansion
19 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
16 % IACS
Electrical Conductivity: Equal Weight (Specific)
16 % IACS
Otherwise Unclassified Properties
Base Metal Price
30 % relative
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
2.9 kg CO2/kg material
Embodied Energy
47 MJ/kg 20 x 103 BTU/lb
Embodied Water
340 L/kg 40 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
28 MJ/m3
Resilience: Unit (Modulus of Resilience)
54 kJ/m3
Stiffness to Weight: Axial
6.8 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
7.3 points
Strength to Weight: Bending
9.5 points
Thermal Diffusivity
22 mm2/s
Thermal Shock Resistance
8.2 points
Alloy Composition
Among cast copper alloys, the composition of CC490K brass is notable for containing a comparatively high amount of lead (Pb) and including sulfur (S). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings. Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity.
| Cu | 81 to 86 | |
| Zn | 7.0 to 9.5 | |
| Pb | 3.0 to 6.0 | |
| Sn | 2.0 to 3.5 | |
| Ni | 0 to 2.0 | |
| Fe | 0 to 0.5 | |
| Sb | 0 to 0.3 | |
| S | 0 to 0.1 | |
| P | 0 to 0.050 | |
| Si | 0 to 0.010 | |
| Al | 0 to 0.010 |
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