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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 106 psi

Elongation at Break

73 %

Fatigue Strength

320 MPa 46 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

83 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

970 MPa 140 x 103 psi

Tensile Strength: Yield (Proof)

510 MPa 74 x 103 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/cm3 520 lb/ft3

Embodied Carbon

8.0 kg CO2/kg material

Embodied Energy

110 MJ/kg 45 x 103 BTU/lb

Embodied Water

400 L/kg 48 gal/lb

Common Calculations

Resilience: Unit (Modulus of Resilience)

600 kJ/m3

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 mm2/s

Thermal Shock Resistance

26 points

Alloy Composition

Cobalt (Co)Co 39 to 41
Chromium (Cr)Cr 19 to 21
Iron (Fe)Fe 10 to 20.5
Nickel (Ni)Ni 14 to 16
Molybdenum (Mo)Mo 6.0 to 8.0
Manganese (Mn)Mn 1.5 to 2.5
Silicon (Si)Si 0 to 1.2
Carbon (C)C 0 to 0.15
Boron (B)B 0 to 0.1
Phosphorus (P)P 0 to 0.015
Sulfur (S)S 0 to 0.015

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

Followup Questions

How are the material properties defined?How do I compare this exact variant to another material?

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