# UNS R30001 Co-Cr-W Alloy

R30001 cobalt is a cobalt alloy. Cited properties are appropriate for the annealed condition. It has a fairly low ductility among cobalt alloys. In addition, it has a moderately high thermal conductivity and a very low tensile strength. The graph bars on the material properties cards below compare R30001 cobalt to other cobalt alloys (top) 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

Compressive (Crushing) Strength

1930 *MPa* 280 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

220 *GPa* 32 *x 10 ^{6} psi*

Elongation at Break

1.0 *%*

Poisson's Ratio

0.28

Rockwell C Hardness

55

Shear Modulus

86 *GPa* 13 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

620 *MPa* 90 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

310 *J/g*

Melting Completion (Liquidus)

1530 *°C* 2790 *°F*

Melting Onset (Solidus)

1260 *°C* 2290 *°F*

Specific Heat Capacity

430 *J/kg-K* 0.1 *BTU/lb-°F*

Thermal Conductivity

15 *W/m-K* 8.4 *BTU/h-ft-°F*

Thermal Expansion

11 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

1.8 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

1.8 *% IACS*

## Otherwise Unclassified Properties

Density

9.0 *g/cm ^{3}* 560

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

130 *MJ/kg* 54 *x 10 ^{3} BTU/lb*

Embodied Water

460 *L/kg* 55 *gal/lb*

## Common Calculations

Stiffness to Weight: Axial

14 *points*

Stiffness to Weight: Bending

22 *points*

Strength to Weight: Axial

19 *points*

Strength to Weight: Bending

18 *points*

Thermal Diffusivity

3.7 *mm ^{2}/s*

Thermal Shock Resistance

19 *points*

## Alloy Composition

Co | 43 to 59 | |

Cr | 28 to 32 | |

W | 11 to 13 | |

C | 2.0 to 3.0 | |

Ni | 0 to 3.0 | |

Fe | 0 to 3.0 | |

Si | 0 to 2.0 | |

Mo | 0 to 1.0 |

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