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
0.34
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
Density
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.
| Cu | 98.6 to 99.4 | |
| Cr | 0.6 to 1.2 | |
| Si | 0 to 0.1 | |
| Fe | 0 to 0.1 | |
| 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