# 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 10 ^{6} psi*

Elongation at Break

8.3 *%*

Poisson's Ratio

0.34

Rockwell B Hardness

80

Shear Modulus

47 *GPa* 6.8 *x 10 ^{6} psi*

Shear Strength

300 *MPa* 43 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

510 *MPa* 74 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

460 *MPa* 67 *x 10 ^{3} 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/cm ^{3}* 560

*lb/ft*

^{3}Embodied Carbon

2.7 *kg CO _{2}/kg material*

Embodied Energy

43 *MJ/kg* 19 *x 10 ^{3} BTU/lb*

Embodied Water

310 *L/kg* 37 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

40 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

900 *kJ/m ^{3}*

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 *mm ^{2}/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