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EN CC498K (CuSn6Zn4Pb2-C) Bronze

CC498K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC498K is the EN numeric designation for this material. CuSn6Zn4Pb2-C is the EN chemical designation.

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

The graph bars on the material properties cards below compare CC498K 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

41 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

260 MPa 37 x 103 psi

Tensile Strength: Yield (Proof)

130 MPa 18 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

1000 °C 1840 °F

Melting Onset (Solidus)

920 °C 1680 °F

Specific Heat Capacity

370 J/kg-K 0.089 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

10 % IACS

Electrical Conductivity: Equal Weight (Specific)

10 % IACS

Otherwise Unclassified Properties

Base Metal Price

32 % relative

Density

8.8 g/cm3 550 lb/ft3

Embodied Carbon

3.2 kg CO2/kg material

Embodied Energy

52 MJ/kg 23 x 103 BTU/lb

Embodied Water

360 L/kg 43 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

30 MJ/m3

Resilience: Unit (Modulus of Resilience)

72 kJ/m3

Stiffness to Weight: Axial

6.9 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 CC498K 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) 85 to 90
Tin (Sn) 5.5 to 6.5
Zinc (Zn) 3.0 to 5.0
Lead (Pb) 1.0 to 2.0
Nickel (Ni) 0 to 1.0
Iron (Fe) 0 to 0.25
Antimony (Sb) 0 to 0.25
Sulfur (S) 0 to 0.1
Phosphorus (P) 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