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Annealed Cast R30075 Alloy

Annealed R30075 cobalt is a type of R30075 cobalt. It is furnished in the annealed (O) condition. It has the lowest strength compared to the other variants of R30075 cobalt. The graph bars on the material properties cards below compare annealed R30075 cobalt to other cobalt alloys (top) and the entire database (bottom). The length of each bar shows the given value as a % of the largest value in the relevant set.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

220 GPa 32 x 106 psi

Elongation at Break

12 %

Fatigue Strength

260 MPa 38 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

20 %

Shear Modulus

87 GPa 13 x 106 psi

Tensile Strength: Ultimate (UTS)

780 MPa 110 x 103 psi

Tensile Strength: Yield (Proof)

480 MPa 70 x 103 psi

Thermal Properties

Latent Heat of Fusion

320 J/g

Melting Completion (Liquidus)

1360 °C 2480 °F

Melting Onset (Solidus)

1290 °C 2360 °F

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

13 W/m-K 7.6 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.1 % IACS

Otherwise Unclassified Properties

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

530 L/kg 63 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

84 MJ/m3

Resilience: Unit (Modulus of Resilience)

520 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

26 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

3.5 m2/s

Thermal Shock Resistance

20 points

Alloy Composition

Cobalt (Co) 58.7 to 68
Chromium (Cr) 27 to 30
Molybdenum (Mo) 5.0 to 7.0
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Iron (Fe) 0 to 0.75
Nickel (Ni) 0 to 0.5
Carbon (C) 0 to 0.35
Nitrogen (N) 0 to 0.25
Tungsten (W) 0 to 0.2
Aluminum (Al) 0 to 0.1
Titanium (Ti) 0 to 0.1
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.010
Boron (B) 0 to 0.010

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

Followup Questions

Further Reading

ASTM F75: Standard Specification for Cobalt-28 Chromium-6 Molybdenum Alloy Castings and Casting Alloy for Surgical Implants (UNS R30075)

ISO 5832-4: Implants for Surgery - Metallic Materials - Part 4: Cobalt-Chromium-Molybdenum Casting Alloy