UNS R30016 Co-Cr-W Alloy
R30016 cobalt is a cobalt alloy. Cited properties are appropriate for the annealed condition. It has a moderately high thermal conductivity among cobalt alloys. In addition, it has a fairly low melting temperature and a moderately low ductility.
The graph bars on the material properties cards below compare R30016 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
1600 MPa 230 x 103 psi
Elastic (Young's, Tensile) Modulus
220 GPa 32 x 106 psi
Elongation at Break
8.4 %
Fatigue Strength
290 MPa 42 x 103 psi
Flexural Strength
2360 MPa 340 x 103 psi
Impact Strength: V-Notched Charpy
8.0 J 5.9 ft-lb
Poisson's Ratio
0.28
Reduction in Area
8.0 %
Rockwell C Hardness
37
Shear Modulus
85 GPa 12 x 106 psi
Tensile Strength: Ultimate (UTS)
1010 MPa 150 x 103 psi
Tensile Strength: Yield (Proof)
580 MPa 84 x 103 psi
Thermal Properties
Latent Heat of Fusion
320 J/g
Melting Completion (Liquidus)
1360 °C 2470 °F
Melting Onset (Solidus)
1270 °C 2310 °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
14 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.9 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.0 % IACS
Otherwise Unclassified Properties
Density
8.5 g/cm3 530 lb/ft3
Embodied Carbon
7.7 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)
72 MJ/m3
Resilience: Unit (Modulus of Resilience)
770 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
33 points
Strength to Weight: Bending
26 points
Thermal Diffusivity
3.9 mm2/s
Thermal Shock Resistance
24 points
Alloy Composition
| Co | 49.6 to 66.9 | |
| Cr | 28 to 32 | |
| W | 3.5 to 5.5 | |
| Ni | 0 to 3.0 | |
| Fe | 0 to 3.0 | |
| Mn | 0.5 to 2.0 | |
| C | 0.9 to 1.4 | |
| Si | 0.2 to 2.0 | |
| Mo | 0 to 1.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Joseph R. Davis (editor), 2000
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993