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EN CC492K (CuSn7Zn2Pb3-C) Leaded Tin Bronze

CC492K bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC492K is the EN numeric designation for this material. CuSn7Zn2Pb3-C is the EN chemical designation.

It has a moderately high thermal conductivity and a moderately high electrical conductivity among cast bronzes.

The graph bars on the material properties cards below compare CC492K 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

40 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

280 MPa 40 x 103 psi

Tensile Strength: Yield (Proof)

150 MPa 21 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

1000 °C 1820 °F

Melting Onset (Solidus)

900 °C 1660 °F

Specific Heat Capacity

370 J/kg-K 0.088 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

13 % IACS

Electrical Conductivity: Equal Weight (Specific)

13 % IACS

Otherwise Unclassified Properties

Base Metal Price

33 % relative

Density

8.8 g/cm3 550 lb/ft3

Embodied Carbon

3.4 kg CO2/kg material

Embodied Energy

54 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)

100 kJ/m3

Stiffness to Weight: Axial

6.8 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.7 points

Strength to Weight: Bending

11 points

Thermal Diffusivity

23 mm2/s

Thermal Shock Resistance

10 points

Alloy Composition

Among cast copper alloys, the composition of CC492K 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) 83 to 89
Tin (Sn) 6.0 to 8.0
Lead (Pb) 2.5 to 3.5
Zinc (Zn) 1.5 to 3.0
Nickel (Ni) 0 to 2.0
Antimony (Sb) 0 to 0.25
Iron (Fe) 0 to 0.2
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