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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.

Copper (Cu) 87 to 89.5
Tin (Sn) 10 to 11.5
Phosphorus (P) 0 to 1.0
Zinc (Zn) 0 to 0.5
Lead (Pb) 0 to 0.25
Nickel (Ni) 0 to 0.1
Iron (Fe) 0 to 0.1
Manganese (Mn) 0 to 0.050
Sulfur (S) 0 to 0.050
Antimony (Sb) 0 to 0.050
Silicon (Si) 0 to 0.010
Aluminum (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