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EN 2.4964 (CoCr20W15Ni) Cobalt Alloy

EN 2.4964 cobalt is a cobalt alloy. 2.4964 is the EN numeric designation for this material. CoCr20W15Ni is the EN chemical designation. It has the highest melting temperature among cobalt alloys. In addition, it has a moderately high thermal conductivity and a moderately high embodied energy.

The graph bars on the material properties cards below compare EN 2.4964 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

Elastic (Young's, Tensile) Modulus

220 GPa 32 x 106 psi

Elongation at Break

40 %

Fatigue Strength

220 MPa 32 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

86 GPa 13 x 106 psi

Tensile Strength: Ultimate (UTS)

960 MPa 140 x 103 psi

Tensile Strength: Yield (Proof)

390 MPa 56 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Melting Completion (Liquidus)

1630 °C 2970 °F

Melting Onset (Solidus)

1550 °C 2820 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.7 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.8 % IACS

Otherwise Unclassified Properties

Density

9.6 g/cm3 600 lb/ft3

Embodied Carbon

9.8 kg CO2/kg material

Embodied Energy

140 MJ/kg 60 x 103 BTU/lb

Embodied Water

450 L/kg 54 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

310 MJ/m3

Resilience: Unit (Modulus of Resilience)

340 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

21 points

Strength to Weight: Axial

28 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

3.9 mm2/s

Thermal Shock Resistance

25 points

Alloy Composition

Cobalt (Co) 46.4 to 58
Chromium (Cr) 19 to 21
Tungsten (W) 14 to 16
Nickel (Ni) 9.0 to 11
Iron (Fe) 0 to 3.0
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 0.4
Carbon (C) 0.050 to 0.15
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.015

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10302: Creep resisting steels, nickel and cobalt alloys