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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 m2/s

Thermal Shock Resistance

26 points

Alloy Composition

Cobalt (Co) 48.6 to 68.1
Chromium (Cr) 27 to 32
Tungsten (W) 4.0 to 6.0
Nickel (Ni) 0 to 3.0
Iron (Fe) 0 to 3.0
Carbon (C) 0.9 to 1.4
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