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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 m2/s

Thermal Shock Resistance

24 points

Alloy Composition

Cobalt (Co) 49.6 to 66.9
Chromium (Cr) 28 to 32
Tungsten (W) 3.5 to 5.5
Nickel (Ni) 0 to 3.0
Iron (Fe) 0 to 3.0
Manganese (Mn) 0.5 to 2.0
Carbon (C) 0.9 to 1.4
Silicon (Si) 0.2 to 2.0
Molybdenum (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