EN CC494K (CuSn5Pb9-C) Leaded Tin Bronze
CC494K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC494K is the EN numeric designation for this material. CuSn5Pb9-C is the EN chemical designation.
It has a very high electrical conductivity among cast bronzes. In addition, it has a fairly low tensile strength and a fairly low ductility.
The graph bars on the material properties cards below compare CC494K bronze to: cast bronzes (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
67
Elastic (Young's, Tensile) Modulus
100 GPa 15 x 106 psi
Elongation at Break
7.6 %
Poisson's Ratio
0.35
Shear Modulus
39 GPa 5.6 x 106 psi
Tensile Strength: Ultimate (UTS)
210 MPa 31 x 103 psi
Tensile Strength: Yield (Proof)
94 MPa 14 x 103 psi
Thermal Properties
Latent Heat of Fusion
180 J/g
Maximum Temperature: Mechanical
160 °C 320 °F
Melting Completion (Liquidus)
970 °C 1770 °F
Melting Onset (Solidus)
890 °C 1640 °F
Specific Heat Capacity
360 J/kg-K 0.085 BTU/lb-°F
Thermal Conductivity
63 W/m-K 36 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
31 % relative
Density
9.1 g/cm3 570 lb/ft3
Embodied Carbon
3.1 kg CO2/kg material
Embodied Energy
50 MJ/kg 21 x 103 BTU/lb
Embodied Water
360 L/kg 43 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
13 MJ/m3
Resilience: Unit (Modulus of Resilience)
43 kJ/m3
Stiffness to Weight: Axial
6.4 points
Stiffness to Weight: Bending
17 points
Strength to Weight: Axial
6.5 points
Strength to Weight: Bending
8.8 points
Thermal Diffusivity
19 mm2/s
Thermal Shock Resistance
7.8 points
Alloy Composition
Among cast copper alloys, the composition of CC494K bronze is notable for containing a comparatively high amount of lead (Pb). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings.
| Cu | 78 to 87 | |
| Pb | 8.0 to 10 | |
| Sn | 4.0 to 6.0 | |
| Ni | 0 to 2.0 | |
| Zn | 0 to 2.0 | |
| Sb | 0 to 0.5 | |
| Fe | 0 to 0.25 | |
| Mn | 0 to 0.2 | |
| P | 0 to 0.1 | |
| S | 0 to 0.1 | |
| 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