EN CC493K (CuSn7Zn4Pb7-C) Bearing Bronze
CC493K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC493K is the EN numeric designation for this material. CuSn7Zn4Pb7-C is the EN chemical designation.
It has a moderately low heat capacity and a moderately low tensile strength among cast bronzes.
The graph bars on the material properties cards below compare CC493K 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
74
Elastic (Young's, Tensile) Modulus
100 GPa 15 x 106 psi
Elongation at Break
14 %
Poisson's Ratio
0.34
Shear Modulus
39 GPa 5.6 x 106 psi
Tensile Strength: Ultimate (UTS)
270 MPa 40 x 103 psi
Tensile Strength: Yield (Proof)
140 MPa 20 x 103 psi
Thermal Properties
Latent Heat of Fusion
180 J/g
Maximum Temperature: Mechanical
160 °C 320 °F
Melting Completion (Liquidus)
960 °C 1760 °F
Melting Onset (Solidus)
880 °C 1610 °F
Specific Heat Capacity
360 J/kg-K 0.086 BTU/lb-°F
Thermal Conductivity
61 W/m-K 35 BTU/h-ft-°F
Thermal Expansion
19 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
12 % IACS
Electrical Conductivity: Equal Weight (Specific)
12 % IACS
Otherwise Unclassified Properties
Base Metal Price
32 % relative
Density
8.9 g/cm3 560 lb/ft3
Embodied Carbon
3.3 kg CO2/kg material
Embodied Energy
53 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)
89 kJ/m3
Stiffness to Weight: Axial
6.5 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
8.6 points
Strength to Weight: Bending
11 points
Thermal Diffusivity
19 mm2/s
Thermal Shock Resistance
10 points
Alloy Composition
Among cast copper alloys, the composition of CC493K 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 | 79 to 86 | |
| Sn | 5.2 to 8.0 | |
| Pb | 5.0 to 8.0 | |
| Zn | 2.0 to 5.0 | |
| Ni | 0 to 2.0 | |
| Sb | 0 to 0.3 | |
| 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