# UNS R30016 Co-Cr-W Alloy

R30016 cobalt is a cobalt alloy. Cited properties are appropriate for the annealed condition. It has a moderately high thermal conductivity among cobalt alloys. In addition, it has a fairly low melting temperature and a moderately low ductility.

The graph bars on the material properties cards below compare R30016 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

1600 *MPa* 230 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

8.4 *%*

Fatigue Strength

290 *MPa* 42 *x 10 ^{3} psi*

Flexural Strength

2360 *MPa* 340 *x 10 ^{3} psi*

Impact Strength: V-Notched Charpy

8.0 *J* 5.9 *ft-lb*

Poisson's Ratio

0.28

Reduction in Area

8.0 *%*

Rockwell C Hardness

37

Shear Modulus

85 *GPa* 12 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

1010 *MPa* 150 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

580 *MPa* 84 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

320 *J/g*

Melting Completion (Liquidus)

1360 *°C* 2470 *°F*

Melting Onset (Solidus)

1270 *°C* 2310 *°F*

Specific Heat Capacity

450 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

15 *W/m-K* 8.6 *BTU/h-ft-°F*

Thermal Expansion

14 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

1.9 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

2.0 *% IACS*

## Otherwise Unclassified Properties

Density

8.5 *g/cm ^{3}* 530

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

110 *MJ/kg* 46 *x 10 ^{3} BTU/lb*

Embodied Water

500 *L/kg* 60 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

72 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

770 *kJ/m ^{3}*

Stiffness to Weight: Axial

14 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

33 *points*

Strength to Weight: Bending

26 *points*

Thermal Diffusivity

3.9 *mm ^{2}/s*

Thermal Shock Resistance

24 *points*

## Alloy Composition

Co | 49.6 to 66.9 | |

Cr | 28 to 32 | |

W | 3.5 to 5.5 | |

Ni | 0 to 3.0 | |

Fe | 0 to 3.0 | |

Mn | 0.5 to 2.0 | |

C | 0.9 to 1.4 | |

Si | 0.2 to 2.0 | |

Mo | 0 to 1.5 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Joseph R. Davis (editor), 2000

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993