# Nickel Alloy 725 (N07725)

Nickel 725 is a nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. N07725 is the UNS number for this material. Nickel Alloy 725 is the common industry name.

It has a moderately low melting temperature and a moderately high embodied energy among wrought nickels.

The graph bars on the material properties cards below compare nickel 725 to: wrought 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* 29 *x 10 ^{6} psi*

Elongation at Break

34 *%*

Fatigue Strength

260 *MPa* 37 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Reduction in Area

45 *%*

Shear Modulus

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

Shear Strength

580 *MPa* 84 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

860 *MPa* 130 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

350 *MPa* 50 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

320 *J/g*

Maximum Temperature: Mechanical

980 *°C* 1800 *°F*

Melting Completion (Liquidus)

1340 *°C* 2450 *°F*

Melting Onset (Solidus)

1270 *°C* 2320 *°F*

Specific Heat Capacity

440 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Expansion

13 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

1.5 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

1.6 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

75 *% relative*

Density

8.5 *g/cm ^{3}* 530

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

190 *MJ/kg* 80 *x 10 ^{3} BTU/lb*

Embodied Water

270 *L/kg* 33 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

240 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

300 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

23 *points*

Strength to Weight: Axial

28 *points*

Strength to Weight: Bending

24 *points*

Thermal Shock Resistance

23 *points*

## Alloy Composition

Ni | 55 to 59 | |

Cr | 19 to 22.5 | |

Fe | 2.3 to 15.3 | |

Mo | 7.0 to 9.5 | |

Nb | 2.8 to 4.0 | |

Ti | 1.0 to 1.7 | |

Mn | 0 to 0.35 | |

Al | 0 to 0.35 | |

Si | 0 to 0.2 | |

C | 0 to 0.030 | |

P | 0 to 0.015 | |

S | 0 to 0.010 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B805: Standard Specification for Precipitation Hardening Nickel Alloys UNS N07716, N07725, N07773, N07776, and N09777, Bar and Wire

Microstructure of Superalloys, Madeleine Durand-Charre, 1998

ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Joseph R. Davis (editor), 2000

Aerospace Materials, Brian Cantor et al. (editors), 2001

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

Nickel Alloys, Ulrich Heubner (editor), 1998