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UNS R30001 Co-Cr-W Alloy

R30001 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 very low tensile strength. The graph bars on the material properties cards below compare R30001 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

1930 MPa 280 x 103 psi

Elastic (Young's, Tensile) Modulus

220 GPa 32 x 106 psi

Elongation at Break

1.0 %

Poisson's Ratio

0.28

Rockwell C Hardness

55

Shear Modulus

86 GPa 13 x 106 psi

Tensile Strength: Ultimate (UTS)

620 MPa 90 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Melting Completion (Liquidus)

1530 °C 2790 °F

Melting Onset (Solidus)

1260 °C 2290 °F

Specific Heat Capacity

430 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.4 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.8 % IACS

Otherwise Unclassified Properties

Density

9.0 g/cm3 560 lb/ft3

Embodied Carbon

8.9 kg CO2/kg material

Embodied Energy

130 MJ/kg 54 x 103 BTU/lb

Embodied Water

460 L/kg 55 gal/lb

Common Calculations

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

22 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

3.7 m2/s

Thermal Shock Resistance

19 points

Alloy Composition

Cobalt (Co) 43 to 59
Chromium (Cr) 28 to 32
Tungsten (W) 11 to 13
Carbon (C) 2.0 to 3.0
Nickel (Ni) 0 to 3.0
Iron (Fe) 0 to 3.0
Silicon (Si) 0 to 2.0
Molybdenum (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