EN CC492K (CuSn7Zn2Pb3-C) Leaded Tin Bronze
CC492K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC492K is the EN numeric designation for this material. CuSn7Zn2Pb3-C is the EN chemical designation.
It has a moderately high thermal conductivity and a moderately high electrical conductivity among cast bronzes.
The graph bars on the material properties cards below compare CC492K 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
78
Elastic (Young's, Tensile) Modulus
110 GPa 16 x 106 psi
Elongation at Break
14 %
Poisson's Ratio
0.34
Shear Modulus
40 GPa 5.9 x 106 psi
Tensile Strength: Ultimate (UTS)
280 MPa 40 x 103 psi
Tensile Strength: Yield (Proof)
150 MPa 21 x 103 psi
Thermal Properties
Latent Heat of Fusion
190 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
1000 °C 1820 °F
Melting Onset (Solidus)
900 °C 1660 °F
Specific Heat Capacity
370 J/kg-K 0.088 BTU/lb-°F
Thermal Conductivity
73 W/m-K 42 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
13 % IACS
Electrical Conductivity: Equal Weight (Specific)
13 % IACS
Otherwise Unclassified Properties
Base Metal Price
33 % relative
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
3.4 kg CO2/kg material
Embodied Energy
54 MJ/kg 23 x 103 BTU/lb
Embodied Water
370 L/kg 44 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
33 MJ/m3
Resilience: Unit (Modulus of Resilience)
100 kJ/m3
Stiffness to Weight: Axial
6.8 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
8.7 points
Strength to Weight: Bending
11 points
Thermal Diffusivity
23 mm2/s
Thermal Shock Resistance
10 points
Alloy Composition
Among cast copper alloys, the composition of CC492K bronze 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 | 83 to 89 | |
| Sn | 6.0 to 8.0 | |
| Pb | 2.5 to 3.5 | |
| Zn | 1.5 to 3.0 | |
| Ni | 0 to 2.0 | |
| Sb | 0 to 0.25 | |
| Fe | 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