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UNS R30012 Co-Cr-W Alloy

R30012 cobalt is a cobalt alloy. Cited properties are appropriate for the annealed condition. It has a fairly low ductility among cobalt alloys. In addition, it has a moderately high thermal conductivity and a moderately low electrical conductivity.

The graph bars on the material properties cards below compare R30012 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

Compressive (Crushing) Strength

1770 MPa 260 x 103 psi

Elastic (Young's, Tensile) Modulus

220 GPa 32 x 106 psi

Elongation at Break

1.0 %

Fatigue Strength

320 MPa 46 x 103 psi

Poisson's Ratio

0.28

Rockwell C Hardness

48

Shear Modulus

86 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

830 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

650 MPa 94 x 103 psi

Thermal Properties

Latent Heat of Fusion

320 J/g

Melting Completion (Liquidus)

1470 °C 2670 °F

Melting Onset (Solidus)

1280 °C 2340 °F

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.5 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.8 % IACS

Otherwise Unclassified Properties

Density

8.8 g/cm3 550 lb/ft3

Embodied Carbon

8.3 kg CO2/kg material

Embodied Energy

120 MJ/kg 50 x 103 BTU/lb

Embodied Water

480 L/kg 58 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

7.7 MJ/m3

Resilience: Unit (Modulus of Resilience)

960 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

26 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

3.8 mm2/s

Thermal Shock Resistance

23 points

Alloy Composition

Cobalt (Co)Co 47.5 to 64.1
Chromium (Cr)Cr 27 to 32
Tungsten (W)W 7.5 to 9.5
Carbon (C)C 1.4 to 2.0
Nickel (Ni)Ni 0 to 3.0
Iron (Fe)Fe 0 to 3.0
Silicon (Si)Si 0 to 2.0
Molybdenum (Mo)Mo 0 to 1.0

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

Followup Questions

Similar Alloys

Further Reading

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015