UNS C18100 Chromium-Zirconium Copper
C18100 copper is a lightly alloyed grade of copper, formulated for primary forming into wrought products. Cited properties are appropriate for the H04 (full hard) temper. It has a moderately high tensile strength and a moderately low ductility among wrought coppers.
The graph bars on the material properties cards below compare C18100 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
8.3 %
Poisson's Ratio
0.34
Rockwell B Hardness
80
Shear Modulus
47 GPa 6.8 x 106 psi
Shear Strength
300 MPa 43 x 103 psi
Tensile Strength: Ultimate (UTS)
510 MPa 74 x 103 psi
Tensile Strength: Yield (Proof)
460 MPa 67 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)
1020 °C 1870 °F
Specific Heat Capacity
390 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
320 W/m-K 190 BTU/h-ft-°F
Thermal Expansion
17 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
2.7 kg CO2/kg material
Embodied Energy
43 MJ/kg 19 x 103 BTU/lb
Embodied Water
310 L/kg 37 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
40 MJ/m3
Resilience: Unit (Modulus of Resilience)
900 kJ/m3
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
16 points
Strength to Weight: Bending
16 points
Thermal Diffusivity
94 mm2/s
Thermal Shock Resistance
18 points
Alloy Composition
Among wrought copper alloys, the composition of C18100 copper is notable for including zirconium (Zr) and chromium (Cr). Zirconium is used to increase recrystallization temperature and to permit or facilitate certain forms of heat treatment. Chromium additions permits certain types of heat treatment to improve mechanical strength.
| Cu | 98.7 to 99.49 | |
| Cr | 0.4 to 1.2 | |
| Zr | 0.080 to 0.2 | |
| Mg | 0.030 to 0.060 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993