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

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 mm²/s

Thermal Shock Resistance

19 points

Alloy Composition

Cobalt (Co)Co		43 to 59
Chromium (Cr)Cr		28 to 32
Tungsten (W)W		11 to 13
Carbon (C)C		2.0 to 3.0
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