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Cold Worked and Aged R30035 Alloy

Cold worked and aged R30035 cobalt is R30035 cobalt in the cold worked and aged condition. It has the highest strength compared to the other variants of R30035 cobalt. The graph bars on the material properties cards below compare cold worked and aged 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 106 psi

Elongation at Break

9.0 %

Fatigue Strength

740 MPa 110 x 103 psi

Poisson's Ratio


Reduction in Area

40 %

Shear Modulus

89 GPa 13 x 106 psi

Tensile Strength: Ultimate (UTS)

1900 MPa 280 x 103 psi

Tensile Strength: Yield (Proof)

1650 MPa 240 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


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)

160 MJ/m3

Resilience: Unit (Modulus of Resilience)

5920 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

61 points

Strength to Weight: Bending

39 points

Thermal Diffusivity

3.0 mm2/s

Thermal Shock Resistance

46 points

Alloy Composition

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