# Annealed R30003 Alloy

Annealed R30003 cobalt is R30003 cobalt in the annealed condition. The graph bars on the material properties cards below compare annealed R30003 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

210 *GPa* 31 *x 10 ^{6} psi*

Elongation at Break

73 *%*

Fatigue Strength

320 *MPa* 46 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

510 *MPa* 74 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

310 *J/g*

Melting Completion (Liquidus)

1400 *°C* 2560 *°F*

Melting Onset (Solidus)

1440 *°C* 2620 *°F*

Specific Heat Capacity

450 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

13 *W/m-K* 7.2 *BTU/h-ft-°F*

Thermal Expansion

13 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

2.0 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

2.1 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

95 *% relative*

Density

8.4 *g/cm ^{3}* 520

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

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

Embodied Water

400 *L/kg* 48 *gal/lb*

## Common Calculations

Resilience: Unit (Modulus of Resilience)

600 *kJ/m ^{3}*

Stiffness to Weight: Axial

14 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

32 *points*

Strength to Weight: Bending

26 *points*

Thermal Diffusivity

3.3 *mm ^{2}/s*

Thermal Shock Resistance

26 *points*

## Alloy Composition

Co | 39 to 41 | |

Cr | 19 to 21 | |

Fe | 10 to 20.5 | |

Ni | 14 to 16 | |

Mo | 6.0 to 8.0 | |

Mn | 1.5 to 2.5 | |

Si | 0 to 1.2 | |

C | 0 to 0.15 | |

B | 0 to 0.1 | |

P | 0 to 0.015 | |

S | 0 to 0.015 |

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

## Followup Questions

## Further Reading

ASTM F1058: Standard Specification for Wrought 40Cobalt-20Chromium-16Iron-15Nickel-7Molybdenum Alloy Wire and Strip for Surgical Implant Applications (UNS R30003 and UNS R30008)

ISO 5832-7: Implants for Surgery - Metallic Materials - Part 7: Forgeable and Cold-Formed Cobalt-Chromium-Nickel-Molybdenum-Iron Alloy

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