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Grade CW6MC (J26625) Cast Nickel

Grade CW6MC nickel is a nickel alloy formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. CW6MC is the ASTM designation for this material. J26625 is the UNS number.

It has the highest base cost among cast nickels. In addition, it has the lowest electrical conductivity and a moderately high embodied energy.

The graph bars on the material properties cards below compare grade CW6MC nickel to: cast nickels (top), all nickel alloys (middle), 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

200 GPa 30 x 106 psi

Elongation at Break

28 %

Fatigue Strength

210 MPa 30 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

79 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

540 MPa 79 x 103 psi

Tensile Strength: Yield (Proof)

310 MPa 45 x 103 psi

Thermal Properties

Latent Heat of Fusion

330 J/g

Maximum Temperature: Mechanical

980 °C 1800 °F

Melting Completion (Liquidus)

1480 °C 2700 °F

Melting Onset (Solidus)

1430 °C 2610 °F

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

11 W/m-K 6.1 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

80 % relative

Density

8.6 g/cm3 540 lb/ft3

Embodied Carbon

14 kg CO2/kg material

Embodied Energy

200 MJ/kg 84 x 103 BTU/lb

Embodied Water

290 L/kg 34 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

240 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

2.8 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Nickel (Ni) 55.4 to 68.9
Chromium (Cr) 20 to 23
Molybdenum (Mo) 8.0 to 10
Niobium (Nb) 3.2 to 4.5
Iron (Fe) 0 to 5.0
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Carbon (C) 0 to 0.060
Sulfur (S) 0 to 0.030
Phosphorus (P) 0 to 0.015

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

Followup Questions

Similar Alloys

Further Reading

ASTM A494: Standard Specification for Castings, Nickel and Nickel Alloy

Welding Metallurgy and Weldability of Nickel-Base Alloys, John C. Lippold et al., 2009

Engineering Properties of Nickel and Nickel Alloys, John L. Everhart, 1971

Nickel Alloys, Ulrich Heubner (editor), 1998