EN CC495K (CuSn10Pb10-C) Leaded Tin Bronze
CC495K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC495K is the EN numeric designation for this material. CuSn10Pb10-C is the EN chemical designation.
It has a fairly low melting temperature among cast bronzes. In addition, it has a fairly low heat capacity and a fairly low ductility.
The graph bars on the material properties cards below compare CC495K 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
76
Elastic (Young's, Tensile) Modulus
100 GPa 15 x 106 psi
Elongation at Break
7.0 %
Poisson's Ratio
0.35
Shear Modulus
37 GPa 5.4 x 106 psi
Tensile Strength: Ultimate (UTS)
240 MPa 34 x 103 psi
Tensile Strength: Yield (Proof)
120 MPa 17 x 103 psi
Thermal Properties
Latent Heat of Fusion
180 J/g
Maximum Temperature: Mechanical
140 °C 290 °F
Melting Completion (Liquidus)
930 °C 1700 °F
Melting Onset (Solidus)
820 °C 1510 °F
Specific Heat Capacity
350 J/kg-K 0.083 BTU/lb-°F
Thermal Conductivity
48 W/m-K 28 BTU/h-ft-°F
Thermal Expansion
19 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
10 % IACS
Electrical Conductivity: Equal Weight (Specific)
10 % IACS
Otherwise Unclassified Properties
Base Metal Price
33 % relative
Density
9.0 g/cm3 560 lb/ft3
Embodied Carbon
3.6 kg CO2/kg material
Embodied Energy
58 MJ/kg 25 x 103 BTU/lb
Embodied Water
400 L/kg 47 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
14 MJ/m3
Resilience: Unit (Modulus of Resilience)
68 kJ/m3
Stiffness to Weight: Axial
6.2 points
Stiffness to Weight: Bending
17 points
Strength to Weight: Axial
7.3 points
Strength to Weight: Bending
9.4 points
Thermal Diffusivity
15 mm2/s
Thermal Shock Resistance
8.8 points
Alloy Composition
Among cast copper alloys, the composition of CC495K 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 | 76 to 82 | |
| Sn | 9.0 to 11 | |
| Pb | 8.0 to 11 | |
| 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