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UNS C18700 (CW113C) Leaded Copper

C18700 copper is a lightly alloyed grade of copper, formulated for primary forming into wrought products. CW113C is the EN numeric designation for this material. C18700 is the UNS number. Additionally, the EN chemical designation is CuPb1P.

It has a moderately low melting temperature among wrought coppers. In addition, it can have a moderately low tensile strength and a moderately low ductility.

The properties of C18700 copper include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C18700 copper to: wrought coppers (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

Elastic (Young's, Tensile) Modulus

110 GPa 17 x 106 psi

Elongation at Break

9.0 to 9.6 %

Poisson's Ratio

0.34

Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

170 to 190 MPa 25 to 28 x 103 psi

Tensile Strength: Ultimate (UTS)

290 to 330 MPa 42 to 47 x 103 psi

Tensile Strength: Yield (Proof)

230 to 250 MPa 34 to 37 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1080 °C 1980 °F

Melting Onset (Solidus)

950 °C 1750 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Conductivity

380 W/m-K 220 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

98 % IACS

Electrical Conductivity: Equal Weight (Specific)

99 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative

Density

9.0 g/cm3 560 lb/ft3

Embodied Carbon

2.6 kg CO2/kg material

Embodied Energy

41 MJ/kg 18 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

24 to 29 MJ/m3

Resilience: Unit (Modulus of Resilience)

240 to 280 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

9.0 to 10 points

Strength to Weight: Bending

11 to 12 points

Thermal Diffusivity

110 mm2/s

Thermal Shock Resistance

10 to 12 points

Alloy Composition

Among wrought copper alloys, the composition of C18700 copper is notable for containing a comparatively high amount of lead (Pb). Lead is used to improve machinability and bearing properties, at the cost of toxicity.

Copper (Cu) 98 to 99.2
Lead (Pb) 0.8 to 1.5
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B301: Standard Specification for Free-Cutting Copper Rod, Bar, Wire, and Shapes

Copper Alloys: Preparation, Properties and Applications, Michael Naboka and Jennifer Giordano (editors), 2013

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001