# TM02 Mill Hardened C70250 Copper

TM02 C70250 copper is C70250 copper in the TM02 (mill hardened to half-hard) temper. It has the second highest strength compared to the other variants of C70250 copper. The graph bars on the material properties cards below compare TM02 C70250 copper to: wrought copper-nickels (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

13 *%*

Poisson's Ratio

0.34

Shear Modulus

44 *GPa* 6.4 *x 10 ^{6} psi*

Shear Strength

410 *MPa* 59 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

670 *MPa* 98 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

600 *MPa* 87 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

220 *J/g*

Maximum Temperature: Mechanical

210 *°C* 400 *°F*

Melting Completion (Liquidus)

1100 *°C* 2000 *°F*

Melting Onset (Solidus)

1080 *°C* 1970 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.094 *BTU/lb-°F*

Thermal Conductivity

170 *W/m-K* 98 *BTU/h-ft-°F*

Thermal Expansion

17 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

40 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

41 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

31 *% relative*

Density

8.9 *g/cm ^{3}* 550

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

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

Embodied Water

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

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

84 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

1530 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.4 *points*

Stiffness to Weight: Bending

18 *points*

Strength to Weight: Axial

21 *points*

Strength to Weight: Bending

19 *points*

Thermal Diffusivity

49 *mm ^{2}/s*

Thermal Shock Resistance

24 *points*

## Alloy Composition

Cu | 92.7 to 97.5 | |

Ni | 2.2 to 4.2 | |

Si | 0.25 to 1.2 | |

Zn | 0 to 1.0 | |

Mg | 0.050 to 0.3 | |

Mn | 0 to 0.1 | |

Pb | 0 to 0.050 | |

res. | 0 to 0.5 |

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

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