EN CC481K (CuSn11P-C) Phosphor Bronze
CC481K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC481K is the EN numeric designation for this material. CuSn11P-C is the EN chemical designation.
It has a very low ductility among cast bronzes. In addition, it has a moderately high base cost and a fairly high embodied energy.
The graph bars on the material properties cards below compare CC481K 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
90
Elastic (Young's, Tensile) Modulus
110 GPa 16 x 106 psi
Elongation at Break
4.5 %
Poisson's Ratio
0.34
Shear Modulus
40 GPa 5.8 x 106 psi
Tensile Strength: Ultimate (UTS)
350 MPa 50 x 103 psi
Tensile Strength: Yield (Proof)
180 MPa 26 x 103 psi
Thermal Properties
Latent Heat of Fusion
190 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
1000 °C 1830 °F
Melting Onset (Solidus)
880 °C 1620 °F
Specific Heat Capacity
370 J/kg-K 0.088 BTU/lb-°F
Thermal Conductivity
64 W/m-K 37 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
10 % IACS
Electrical Conductivity: Equal Weight (Specific)
10 % IACS
Otherwise Unclassified Properties
Base Metal Price
35 % relative
Density
8.7 g/cm3 550 lb/ft3
Embodied Carbon
3.7 kg CO2/kg material
Embodied Energy
60 MJ/kg 26 x 103 BTU/lb
Embodied Water
390 L/kg 47 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
13 MJ/m3
Resilience: Unit (Modulus of Resilience)
150 kJ/m3
Stiffness to Weight: Axial
6.9 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
11 points
Strength to Weight: Bending
13 points
Thermal Diffusivity
20 mm2/s
Thermal Shock Resistance
13 points
Alloy Composition
Among cast copper alloys, the composition of CC481K bronze is notable for containing a comparatively high amount of tin (Sn) and including manganese (Mn). Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media. It also places certain constraints on cast part design, so as to avoid porosity problems. Manganese is used to improve strength without a proportional reduction in ductility.
| Cu | 87 to 89.5 | |
| Sn | 10 to 11.5 | |
| P | 0 to 1.0 | |
| Zn | 0 to 0.5 | |
| Pb | 0 to 0.25 | |
| Ni | 0 to 0.1 | |
| Fe | 0 to 0.1 | |
| Mn | 0 to 0.050 | |
| S | 0 to 0.050 | |
| Sb | 0 to 0.050 | |
| 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