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UNS C18200 (CW105C) Chromium Copper

C18200 copper is a lightly alloyed grade of copper, formulated for primary forming into wrought products. CW105C is the EN numeric designation for this material. C18200 is the UNS number. Additionally, the EN chemical designation is CuCr1. And the British Standard (BS) designation is CC101.

It can have a moderately high ductility among the wrought coppers in the database.

The properties of C18200 copper include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C18200 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

120 GPa 17 x 106 psi

Elongation at Break

11 to 40 %

Poisson's Ratio


Rockwell B Hardness

65 to 82

Shear Modulus

44 GPa 6.3 x 106 psi

Shear Strength

210 to 320 MPa 31 to 47 x 103 psi

Tensile Strength: Ultimate (UTS)

310 to 530 MPa 45 to 77 x 103 psi

Tensile Strength: Yield (Proof)

97 to 450 MPa 14 to 65 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1080 °C 1970 °F

Melting Onset (Solidus)

1070 °C 1960 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

320 W/m-K 190 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

80 % IACS

Electrical Conductivity: Equal Weight (Specific)

81 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative


8.9 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)

43 to 96 MJ/m3

Resilience: Unit (Modulus of Resilience)

40 to 860 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

9.6 to 16 points

Strength to Weight: Bending

11 to 16 points

Thermal Diffusivity

93 mm2/s

Thermal Shock Resistance

11 to 18 points

Alloy Composition

Among wrought copper alloys, the composition of C18200 copper is notable for including chromium (Cr) and silicon (Si). Chromium additions permits certain types of heat treatment to improve mechanical strength. Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.

Copper (Cu)Cu 98.6 to 99.4
Chromium (Cr)Cr 0.6 to 1.2
Silicon (Si)Si 0 to 0.1
Iron (Fe)Fe 0 to 0.1
Lead (Pb)Pb 0 to 0.050

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

Followup Questions

Similar Alloys

Further Reading

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993