# Half-Hard and Stress Relieved (HR02) C19025 Copper

HR02 C19025 copper is C19025 copper in the HR02 (half-hard and stress relieved) temper. It has the lowest strength and highest ductility compared to the other variants of C19025 copper. The graph bars on the material properties cards below compare HR02 C19025 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

17 *%*

Poisson's Ratio

0.34

Shear Modulus

43 *GPa* 6.3 *x 10 ^{6} psi*

Shear Strength

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

Tensile Strength: Ultimate (UTS)

480 *MPa* 70 *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* 1980 *°F*

Melting Onset (Solidus)

1020 *°C* 1870 *°F*

Specific Heat Capacity

380 *J/kg-K* 0.092 *BTU/lb-°F*

Thermal Conductivity

160 *W/m-K* 93 *BTU/h-ft-°F*

Thermal Expansion

17 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

40 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

40 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

31 *% relative*

Density

8.9 *g/cm ^{3}* 560

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

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

Embodied Water

320 *L/kg* 38 *gal/lb*

## Common Calculations

Stiffness to Weight: Axial

7.2 *points*

Stiffness to Weight: Bending

18 *points*

Strength to Weight: Axial

15 *points*

Strength to Weight: Bending

15 *points*

Thermal Diffusivity

47 *mm ^{2}/s*

Thermal Shock Resistance

17 *points*

## Alloy Composition

Cu | 97.1 to 98.5 | |

Ni | 0.8 to 1.2 | |

Sn | 0.7 to 1.1 | |

Zn | 0 to 0.2 | |

P | 0.030 to 0.070 | |

res. | 0 to 0.3 |

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

## Followup Questions

## Further Reading

ASTM B422: Standard Specification for Copper-Aluminum-Silicon-Cobalt Alloy, Copper-Nickel-Silicon-Magnesium Alloy, Copper-Nickel-Silicon Alloy, Copper-Nickel-Aluminum-Magnesium Alloy, and Copper- Nickel-Tin Alloy Sheet and Strip

Copper Alloys: Preparation, Properties and Applications, Michael Naboka and Jennifer Giordano (editors), 2013

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001