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Annealed R30035 Alloy

Annealed R30035 cobalt is R30035 cobalt in the annealed condition. It has the lowest strength compared to the other variants of R30035 cobalt. The graph bars on the material properties cards below compare annealed 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

220 GPa 31 x 106 psi

Elongation at Break

46 %

Fatigue Strength

170 MPa 25 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

74 %

Rockwell B Hardness

99

Shear Modulus

84 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

900 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

300 MPa 44 x 103 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/cm3 540 lb/ft3

Embodied Carbon

10 kg CO2/kg material

Embodied Energy

140 MJ/kg 59 x 103 BTU/lb

Embodied Water

410 L/kg 49 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

320 MJ/m3

Resilience: Unit (Modulus of Resilience)

210 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

29 points

Strength to Weight: Bending

24 points

Thermal Diffusivity

3.0 mm2/s

Thermal Shock Resistance

23 points

Alloy Composition

Nickel (Ni) 33 to 37
Cobalt (Co) 29.1 to 39
Chromium (Cr) 19 to 21
Molybdenum (Mo) 9.0 to 10.5
Iron (Fe) 0 to 1.0
Titanium (Ti) 0 to 1.0
Manganese (Mn) 0 to 0.15
Silicon (Si) 0 to 0.15
Carbon (C) 0 to 0.025
Phosphorus (P) 0 to 0.015
Boron (B) 0 to 0.015
Sulfur (S) 0 to 0.010

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

Followup Questions

Further Reading

ASTM F688: Standard Specification for Wrought Cobalt-35 Nickel-20 Chromium-10 Molybdenum Alloy Plate, Sheet, and Foil for Surgical Implants (UNS R30035)

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