# 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 10 ^{6} psi*

Elongation at Break

28 *%*

Fatigue Strength

210 *MPa* 30 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

79 *GPa* 11 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

540 *MPa* 79 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

310 *MPa* 45 *x 10 ^{3} 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/cm ^{3}* 540

*lb/ft*

^{3}Embodied Carbon

14 *kg CO _{2}/kg material*

Embodied Energy

200 *MJ/kg* 84 *x 10 ^{3} BTU/lb*

Embodied Water

290 *L/kg* 34 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

240 *kJ/m ^{3}*

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 *mm ^{2}/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