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Heat Treated Cast R30075 Alloy

Heat treated cast R30075 cobalt is a type of R30075 cobalt. The graph bars on the material properties cards below compare heat treated cast R30075 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 GPa 32 x 106 psi

Elongation at Break

12 %

Fatigue Strength

250 MPa 37 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

20 %

Shear Modulus

87 GPa 13 x 106 psi

Tensile Strength: Ultimate (UTS)

960 MPa 140 x 103 psi

Tensile Strength: Yield (Proof)

500 MPa 72 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)

99 MJ/m3

Resilience: Unit (Modulus of Resilience)

560 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

32 points

Strength to Weight: Bending

26 points

Thermal Diffusivity

3.5 m2/s

Thermal Shock Resistance

25 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