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
| Ni | 55.4 to 68.9 | |
| Cr | 20 to 23 | |
| Mo | 8.0 to 10 | |
| Nb | 3.2 to 4.5 | |
| Fe | 0 to 5.0 | |
| Mn | 0 to 1.0 | |
| Si | 0 to 1.0 | |
| C | 0 to 0.060 | |
| S | 0 to 0.030 | |
| 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