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UNS R30075 (ASTM F75, ISO 5832-4) Co-Cr-Mo Alloy

R30075 cobalt is a cobalt alloy. ASTM F75 is the defining standard for this material. R30075 is the UNS number. The properties of R30075 cobalt include three common variations. The property values on this page show 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 R30075 cobalt to other cobalt alloys (top) and the entire database (bottom).

Mechanical Properties

Elastic (Young's, Tensile) Modulus

220 GPa 32 x 106 psi

Elongation at Break

12 %

Fatigue Strength

250 to 840 MPa 37 to 120 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 to 1280 MPa 110 to 190 x 103 psi

Tensile Strength: Yield (Proof)

480 to 840 MPa 70 to 120 x 103 psi

Thermal Properties

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 to 140 MJ/m3

Resilience: Unit (Modulus of Resilience)

520 to 1580 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

26 to 42 points

Strength to Weight: Bending

22 to 31 points

Thermal Diffusivity

3.5 m2/s

Thermal Shock Resistance

20 to 33 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

Similar Alloys

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