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EN CC491K (CuSn5Zn5Pb5-C) Leaded Tin Bronze

CC491K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC491K is the EN numeric designation for this material. CuSn5Zn5Pb5-C is the EN chemical designation.

It has a fairly high electrical conductivity among cast bronzes. In addition, it has a moderately high thermal conductivity and a moderately low tensile strength.

The graph bars on the material properties cards below compare CC491K 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

73

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

13 %

Poisson's Ratio

0.34

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

260 MPa 37 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 17 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 330 °F

Melting Completion (Liquidus)

980 °C 1790 °F

Melting Onset (Solidus)

900 °C 1650 °F

Specific Heat Capacity

370 J/kg-K 0.087 BTU/lb-°F

Thermal Conductivity

71 W/m-K 41 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

15 % IACS

Electrical Conductivity: Equal Weight (Specific)

15 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative

Density

8.9 g/cm3 550 lb/ft3

Embodied Carbon

3.1 kg CO2/kg material

Embodied Energy

51 MJ/kg 22 x 103 BTU/lb

Embodied Water

350 L/kg 42 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

27 MJ/m3

Resilience: Unit (Modulus of Resilience)

67 kJ/m3

Stiffness to Weight: Axial

6.7 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.1 points

Strength to Weight: Bending

10 points

Thermal Diffusivity

22 mm2/s

Thermal Shock Resistance

9.3 points

Alloy Composition

Among cast copper alloys, the composition of CC491K 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.

Copper (Cu) 81 to 87
Tin (Sn) 4.0 to 6.0
Lead (Pb) 4.0 to 6.0
Zinc (Zn) 4.0 to 6.0
Nickel (Ni) 0 to 2.0
Iron (Fe) 0 to 0.3
Antimony (Sb) 0 to 0.25
Phosphorus (P) 0 to 0.1
Sulfur (S) 0 to 0.1
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