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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.

Copper (Cu) 98.7 to 99.49
Chromium (Cr) 0.4 to 1.2
Zirconium (Zr) 0.080 to 0.2
Magnesium (Mg) 0.030 to 0.060
Residuals 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