# EN 2.4964 (CoCr20W15Ni) Cobalt Alloy

EN 2.4964 cobalt is a cobalt alloy. 2.4964 is the EN numeric designation for this material. CoCr20W15Ni is the EN chemical designation. It has the highest melting temperature among cobalt alloys. In addition, it has a moderately high thermal conductivity and a moderately high embodied energy.

The graph bars on the material properties cards below compare EN 2.4964 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

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

40 *%*

Fatigue Strength

220 *MPa* 32 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

960 *MPa* 140 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

390 *MPa* 56 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

290 *J/g*

Melting Completion (Liquidus)

1630 *°C* 2970 *°F*

Melting Onset (Solidus)

1550 *°C* 2820 *°F*

Specific Heat Capacity

400 *J/kg-K* 0.1 *BTU/lb-°F*

Thermal Conductivity

15 *W/m-K* 8.7 *BTU/h-ft-°F*

Thermal Expansion

12 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

1.9 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

1.8 *% IACS*

## Otherwise Unclassified Properties

Density

9.6 *g/cm ^{3}* 600

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

140 *MJ/kg* 60 *x 10 ^{3} BTU/lb*

Embodied Water

450 *L/kg* 54 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

310 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

340 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

21 *points*

Strength to Weight: Axial

28 *points*

Strength to Weight: Bending

23 *points*

Thermal Diffusivity

3.9 *mm ^{2}/s*

Thermal Shock Resistance

25 *points*

## Alloy Composition

Co | 46.4 to 58 | |

Cr | 19 to 21 | |

W | 14 to 16 | |

Ni | 9.0 to 11 | |

Fe | 0 to 3.0 | |

Mn | 0 to 2.0 | |

Si | 0 to 0.4 | |

C | 0.050 to 0.15 | |

P | 0 to 0.020 | |

S | 0 to 0.015 |

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

## Followup Questions

## Similar Alloys

## Further Reading

EN 10302: Creep resisting steels, nickel and cobalt alloys