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UNS R30035 (2.4999) Co-Ni-Cr-Mo Alloy

R30035 cobalt is a cobalt alloy. It has a moderately low electrical conductivity among cobalt alloys. In addition, it has a moderately high embodied energy and a moderately low thermal conductivity.

The properties of R30035 cobalt include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 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 to 230 GPa 31 to 34 x 106 psi

Elongation at Break

9.0 to 46 %

Fatigue Strength

170 to 740 MPa 25 to 110 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

40 to 74 %

Shear Modulus

84 to 89 GPa 12 to 13 x 106 psi

Tensile Strength: Ultimate (UTS)

900 to 1900 MPa 130 to 280 x 103 psi

Tensile Strength: Yield (Proof)

300 to 1650 MPa 44 to 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

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)

160 to 320 MJ/m3

Resilience: Unit (Modulus of Resilience)

210 to 5920 kJ/m3

Stiffness to Weight: Axial

14 to 15 points

Stiffness to Weight: Bending

23 to 24 points

Strength to Weight: Axial

29 to 61 points

Strength to Weight: Bending

24 to 39 points

Thermal Diffusivity

3.0 m2/s

Thermal Shock Resistance

23 to 46 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