EN CC496K (CuSn7Pb15-C) High-Leaded Tin Bronze
CC496K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC496K is the EN numeric designation for this material. CuSn7Pb15-C is the EN chemical designation.
It has a very low heat capacity among cast bronzes. In addition, it has a fairly low melting temperature and a fairly low tensile strength.
The graph bars on the material properties cards below compare CC496K 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
72
Elastic (Young's, Tensile) Modulus
97 GPa 14 x 106 psi
Elongation at Break
8.6 %
Poisson's Ratio
0.35
Shear Modulus
36 GPa 5.2 x 106 psi
Tensile Strength: Ultimate (UTS)
210 MPa 31 x 103 psi
Tensile Strength: Yield (Proof)
99 MPa 14 x 103 psi
Thermal Properties
Latent Heat of Fusion
170 J/g
Maximum Temperature: Mechanical
140 °C 280 °F
Melting Completion (Liquidus)
900 °C 1660 °F
Melting Onset (Solidus)
820 °C 1510 °F
Specific Heat Capacity
340 J/kg-K 0.080 BTU/lb-°F
Thermal Conductivity
52 W/m-K 30 BTU/h-ft-°F
Thermal Expansion
19 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
11 % IACS
Electrical Conductivity: Equal Weight (Specific)
11 % IACS
Otherwise Unclassified Properties
Base Metal Price
31 % relative
Density
9.2 g/cm3 570 lb/ft3
Embodied Carbon
3.3 kg CO2/kg material
Embodied Energy
52 MJ/kg 23 x 103 BTU/lb
Embodied Water
380 L/kg 45 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
15 MJ/m3
Resilience: Unit (Modulus of Resilience)
50 kJ/m3
Stiffness to Weight: Axial
5.9 points
Stiffness to Weight: Bending
17 points
Strength to Weight: Axial
6.5 points
Strength to Weight: Bending
8.6 points
Thermal Diffusivity
17 mm2/s
Thermal Shock Resistance
8.1 points
Alloy Composition
Among cast copper alloys, the composition of CC496K 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 | 72 to 79.5 | |
| Pb | 13 to 17 | |
| Sn | 6.0 to 8.0 | |
| Ni | 0.5 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