# Hot Forged R30035 Alloy

Hot forged R30035 cobalt is R30035 cobalt in the hot worked condition. The graph bars on the material properties cards below compare hot forged R30035 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

230 *GPa* 34 *x 10 ^{6} psi*

Fatigue Strength

500 *MPa* 73 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

1200 *MPa* 170 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

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

## Thermal Properties

Latent Heat of Fusion

320 *J/g*

Melting Completion (Liquidus)

1440 *°C* 2620 *°F*

Melting Onset (Solidus)

1320 *°C* 2400 *°F*

Specific Heat Capacity

440 *J/kg-K* 0.1 *BTU/lb-°F*

Thermal Conductivity

11 *W/m-K* 6.5 *BTU/h-ft-°F*

Thermal Expansion

13 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

1.7 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

1.8 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

100 *% relative*

Density

8.7 *g/cm ^{3}* 540

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

140 *MJ/kg* 59 *x 10 ^{3} BTU/lb*

Embodied Water

410 *L/kg* 49 *gal/lb*

## Common Calculations

Resilience: Unit (Modulus of Resilience)

2090 *kJ/m ^{3}*

Stiffness to Weight: Axial

15 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

39 *points*

Strength to Weight: Bending

29 *points*

Thermal Diffusivity

3.0 *mm ^{2}/s*

Thermal Shock Resistance

29 *points*

## Alloy Composition

Ni | 33 to 37 | |

Co | 29.1 to 39 | |

Cr | 19 to 21 | |

Mo | 9.0 to 10.5 | |

Fe | 0 to 1.0 | |

Ti | 0 to 1.0 | |

Mn | 0 to 0.15 | |

Si | 0 to 0.15 | |

C | 0 to 0.025 | |

P | 0 to 0.015 | |

B | 0 to 0.015 | |

S | 0 to 0.010 |

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

## Followup Questions

## Further Reading

ASTM F562: Standard Specification for Wrought 35Cobalt-35Nickel-20Chromium-10Molybdenum Alloy for Surgical Implant Applications (UNS R30035)

ASTM F961: Standard Specification for 35Cobalt-35Nickel-20Chromium-10Molybdenum Alloy Forgings for Surgical Implants (UNS R30035)

ISO 5832-6: Implants for Surgery - Metallic Materials - Part 6: Wrought Cobalt-Nickel-Chromium-Molybdenum Alloy

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