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UNS N08020 (2.4660) Stainless Steel

N08020 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. 2.4660 is the EN numeric designation for this material. N08020 is the UNS number.

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 the lowest electrical conductivity among wrought superaustenitic stainless steels. In addition, it can have a moderately low ductility and has a fairly high base cost.

The properties of N08020 stainless steel 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 N08020 stainless steel to: wrought superaustenitic stainless steels (top), all iron 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.

Annealed N08020 Stainless Steel Cold Finished N08020 Stainless Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 10⁶ psi

Elongation at Break

15 to 34 %

Fatigue Strength

210 to 240 MPa 31 to 35 x 10³ psi

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 10⁶ psi

Shear Strength

380 to 410 MPa 55 to 59 x 10³ psi

Tensile Strength: Ultimate (UTS)

610 to 620 MPa 89 to 90 x 10³ psi

Tensile Strength: Yield (Proof)

270 to 420 MPa 39 to 60 x 10³ psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

490 °C 920 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1410 °C 2570 °F

Melting Onset (Solidus)

1360 °C 2480 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 7.0 BTU/h-ft-°F

Thermal Expansion

15 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

38 % relative

Density

8.2 g/cm³ 510 lb/ft³

Embodied Carbon

6.6 kg CO₂/kg material

Embodied Energy

92 MJ/kg 40 x 10³ BTU/lb

Embodied Water

220 L/kg 26 gal/lb

Common Calculations

PREN (Pitting Resistance)

Resilience: Ultimate (Unit Rupture Work)

83 to 170 MJ/m³

Resilience: Unit (Modulus of Resilience)

180 to 440 kJ/m³

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

21 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

3.2 mm²/s

Thermal Shock Resistance

15 points

Alloy Composition

Among wrought stainless steels, the composition of N08020 stainless steel is notable for containing a comparatively high amount of nickel (Ni) and including niobium (Nb). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Iron (Fe)Fe		29.9 to 44
Nickel (Ni)Ni		32 to 38
Chromium (Cr)Cr		19 to 21
Copper (Cu)Cu		3.0 to 4.0
Molybdenum (Mo)Mo		2.0 to 3.0
Manganese (Mn)Mn		0 to 2.0
Silicon (Si)Si		0 to 1.0
Niobium (Nb)Nb		0 to 1.0
Carbon (C)C		0 to 0.070
Phosphorus (P)P		0 to 0.045
Sulfur (S)S		0 to 0.035