EN CC497K (CuSn5Pb20-C) High-Leaded Tin Bronze
CC497K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC497K is the EN numeric designation for this material. CuSn5Pb20-C is the EN chemical designation.
It has a very low heat capacity among cast bronzes. In addition, it has a very low tensile strength and a very low melting temperature.
The graph bars on the material properties cards below compare CC497K 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
55
Elastic (Young's, Tensile) Modulus
93 GPa 13 x 106 psi
Elongation at Break
6.7 %
Poisson's Ratio
0.36
Shear Modulus
34 GPa 5.0 x 106 psi
Tensile Strength: Ultimate (UTS)
190 MPa 27 x 103 psi
Tensile Strength: Yield (Proof)
91 MPa 13 x 103 psi
Thermal Properties
Latent Heat of Fusion
160 J/g
Maximum Temperature: Mechanical
130 °C 260 °F
Melting Completion (Liquidus)
870 °C 1600 °F
Melting Onset (Solidus)
800 °C 1480 °F
Specific Heat Capacity
330 J/kg-K 0.078 BTU/lb-°F
Thermal Conductivity
53 W/m-K 31 BTU/h-ft-°F
Thermal Expansion
20 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
9.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.7 % IACS
Otherwise Unclassified Properties
Base Metal Price
29 % relative
Density
9.3 g/cm3 580 lb/ft3
Embodied Carbon
3.0 kg CO2/kg material
Embodied Energy
48 MJ/kg 21 x 103 BTU/lb
Embodied Water
370 L/kg 44 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
10 MJ/m3
Resilience: Unit (Modulus of Resilience)
45 kJ/m3
Stiffness to Weight: Axial
5.5 points
Stiffness to Weight: Bending
16 points
Strength to Weight: Axial
5.6 points
Strength to Weight: Bending
7.8 points
Thermal Diffusivity
17 mm2/s
Thermal Shock Resistance
7.2 points
Alloy Composition
Among cast copper alloys, the composition of CC497K 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 | 67.5 to 77.5 | |
| Pb | 18 to 23 | |
| Sn | 4.0 to 6.0 | |
| Ni | 0.5 to 2.5 | |
| Zn | 0 to 2.0 | |
| Sb | 0 to 0.75 | |
| 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