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Cold Worked and Aged R30008 Cobalt

Cold worked and aged R30008 cobalt is R30008 cobalt in the cold worked and aged condition. The graph bars on the material properties cards below compare cold worked and aged R30008 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

1.1 %

Fatigue Strength

530 MPa 77 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

83 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

1700 MPa 250 x 103 psi

Tensile Strength: Yield (Proof)

1080 MPa 160 x 103 psi

Thermal Properties

Latent Heat of Fusion

320 J/g

Melting Completion (Liquidus)

1400 °C 2550 °F

Melting Onset (Solidus)

1330 °C 2430 °F

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

13 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

95 % relative

Density

8.4 g/cm3 530 lb/ft3

Embodied Carbon

8.1 kg CO2/kg material

Embodied Energy

110 MJ/kg 46 x 103 BTU/lb

Embodied Water

400 L/kg 48 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

17 MJ/m3

Resilience: Unit (Modulus of Resilience)

2720 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

56 points

Strength to Weight: Bending

37 points

Thermal Shock Resistance

44 points

Alloy Composition

Cobalt (Co) 39 to 42
Chromium (Cr) 18.5 to 21.5
Nickel (Ni) 15 to 18
Iron (Fe) 7.6 to 20
Molybdenum (Mo) 6.5 to 7.5
Manganese (Mn) 1.0 to 2.0
Silicon (Si) 0 to 1.2
Carbon (C) 0 to 0.15
Phosphorus (P) 0 to 0.015
Sulfur (S) 0 to 0.015
Boron (B) 0 to 0.0010

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

Followup Questions

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