# Cold Worked UNS R05200 Cast Unalloyed Tantalum

Cold worked R05200 tantalum is R05200 tantalum in the cold worked (strain hardened) condition. It has the highest strength and lowest ductility compared to the other variants of R05200 tantalum.

The graph bars on the material properties cards below compare cold worked R05200 tantalum to: tantalum alloys (top), all alloys in the same category (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

190 *GPa* 27 *x 10 ^{6} psi*

Elongation at Break

1.1 *%*

Poisson's Ratio

0.34

Shear Modulus

69 *GPa* 10 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

540 *MPa* 78 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

390 *MPa* 57 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

140 *J/g*

Melting Completion (Liquidus)

3020 *°C* 5460 *°F*

Specific Heat Capacity

140 *J/kg-K* 0.034 *BTU/lb-°F*

Thermal Conductivity

59 *W/m-K* 34 *BTU/h-ft-°F*

Thermal Expansion

6.5 *µm/m-K*

## Otherwise Unclassified Properties

Density

17 *g/cm ^{3}* 1040

*lb/ft*

^{3}Embodied Water

650 *L/kg* 77 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

5.5 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

420 *kJ/m ^{3}*

Stiffness to Weight: Axial

6.2 *points*

Stiffness to Weight: Bending

11 *points*

Strength to Weight: Axial

9.0 *points*

Strength to Weight: Bending

8.8 *points*

Thermal Diffusivity

25 *mm ^{2}/s*

Thermal Shock Resistance

32 *points*

## Alloy Composition

Ta | 99.8 to 100 | |

Nb | 0 to 0.1 | |

W | 0 to 0.050 | |

Mo | 0 to 0.020 | |

O | 0 to 0.015 | |

C | 0 to 0.010 | |

Ni | 0 to 0.010 | |

Fe | 0 to 0.010 | |

N | 0 to 0.010 | |

Ti | 0 to 0.010 | |

Si | 0 to 0.0050 | |

H | 0 to 0.0015 |

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

## Followup Questions

## Further Reading

ASTM F560: Standard Specification for Unalloyed Tantalum for Surgical Implant Applications (UNS R05200, UNS R05400)

ASTM B365: Standard Specification for Tantalum and Tantalum Alloy Rod and Wire

ASTM B521: Standard Specification for Tantalum and Tantalum Alloy Seamless and Welded Tubes

ASTM B708: Standard Specification for Tantalum and Tantalum Alloy Plate, Sheet, and Strip