UNS R30006 Co-Cr-W Alloy
R30006 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 tensile strength.
The graph bars on the material properties cards below compare R30006 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
1520 MPa 220 x 103 psi
Elastic (Young's, Tensile) Modulus
220 GPa 32 x 106 psi
Elongation at Break
1.0 %
Fatigue Strength
260 MPa 38 x 103 psi
Poisson's Ratio
0.28
Rockwell C Hardness
40
Shear Modulus
85 GPa 12 x 106 psi
Tensile Strength: Ultimate (UTS)
900 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
540 MPa 78 x 103 psi
Thermal Properties
Latent Heat of Fusion
320 J/g
Melting Completion (Liquidus)
1400 °C 2550 °F
Melting Onset (Solidus)
1290 °C 2350 °F
Specific Heat Capacity
450 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
15 W/m-K 8.6 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.6 % IACS
Electrical Conductivity: Equal Weight (Specific)
1.7 % IACS
Otherwise Unclassified Properties
Calomel Potential
-250 mV
Density
8.6 g/cm3 540 lb/ft3
Embodied Carbon
7.8 kg CO2/kg material
Embodied Energy
110 MJ/kg 46 x 103 BTU/lb
Embodied Water
500 L/kg 60 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
7.8 MJ/m3
Resilience: Unit (Modulus of Resilience)
670 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
29 points
Strength to Weight: Bending
24 points
Thermal Diffusivity
3.9 mm2/s
Thermal Shock Resistance
26 points
Alloy Composition
| Co | 48.6 to 68.1 | |
| Cr | 27 to 32 | |
| W | 4.0 to 6.0 | |
| Ni | 0 to 3.0 | |
| Fe | 0 to 3.0 | |
| C | 0.9 to 1.4 | |
| Si | 0 to 2.0 | |
| 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