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Nickel Alloy 625 (N06625, NA21)

Nickel 625 is a nickel alloy formulated for primary forming into wrought products. NA21 is the British Standard (BS) designation for this material. N06625 is the UNS number. Nickel Alloy 625 is the common industry name. Additionally, the AFNOR (French) designation is NC22DNb.

This material is well established: the Further Reading section below cites a number of published standards, and that list is not necessarily exhaustive.

It has a moderately high base cost among wrought nickels. In addition, it has a moderately high embodied energy and a moderately low melting temperature.

The properties of nickel 625 include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare nickel 625 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.

Grade 1 (Annealed) Nickel Alloy 625 Grade 2 (Solution Treated) Nickel Alloy 625

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 30 x 10⁶ psi

Elongation at Break

33 to 34 %

Fatigue Strength

240 to 320 MPa 34 to 47 x 10³ psi

Poisson's Ratio

0.29

Shear Modulus

79 GPa 11 x 10⁶ psi

Shear Strength

530 to 600 MPa 77 to 87 x 10³ psi

Tensile Strength: Ultimate (UTS)

790 to 910 MPa 120 to 130 x 10³ psi

Tensile Strength: Yield (Proof)

320 to 450 MPa 47 to 65 x 10³ psi

Thermal Properties

Curie Temperature

-200 °C -320 °F

Latent Heat of Fusion

330 J/g

Maximum Temperature: Mechanical

980 °C 1800 °F

Melting Completion (Liquidus)

1350 °C 2460 °F

Melting Onset (Solidus)

1290 °C 2350 °F

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

11 W/m-K 6.4 BTU/h-ft-°F

Thermal Expansion

13 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

190 MJ/kg 83 x 10³ BTU/lb

Embodied Water

290 L/kg 35 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

220 to 250 MJ/m³

Resilience: Unit (Modulus of Resilience)

260 to 490 kJ/m³

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

26 to 29 points

Strength to Weight: Bending

22 to 24 points

Thermal Diffusivity

2.9 mm²/s

Thermal Shock Resistance

22 to 25 points

Alloy Composition

Nickel (Ni)Ni		58 to 68.9
Chromium (Cr)Cr		20 to 23
Molybdenum (Mo)Mo		8.0 to 10
Niobium (Nb)Nb		3.2 to 4.2
Iron (Fe)Fe		0 to 5.0
Cobalt (Co)Co		0 to 1.0
Manganese (Mn)Mn		0 to 0.5
Silicon (Si)Si		0 to 0.5
Aluminum (Al)Al		0 to 0.4
Titanium (Ti)Ti		0 to 0.4
Carbon (C)C		0 to 0.1
Phosphorus (P)P		0 to 0.015
Sulfur (S)S		0 to 0.015