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UNS N08031 (Alloy 31, 1.4562) Stainless Steel

N08031 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 1.4562 is the EN numeric designation for this material. N08031 is the UNS number. And Alloy 31 is the common industry name.

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 very high base cost among wrought superaustenitic stainless steels. In addition, it has a very high embodied energy and a moderately high ductility.

The graph bars on the material properties cards below compare N08031 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.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 10⁶ psi

Elongation at Break

45 %

Fatigue Strength

290 MPa 42 x 10³ psi

Poisson's Ratio

0.28

Shear Modulus

81 GPa 12 x 10⁶ psi

Shear Strength

510 MPa 74 x 10³ psi

Tensile Strength: Ultimate (UTS)

730 MPa 110 x 10³ psi

Tensile Strength: Yield (Proof)

310 MPa 45 x 10³ psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

460 °C 850 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1440 °C 2630 °F

Melting Onset (Solidus)

1390 °C 2540 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 6.8 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

39 % relative

Density

8.1 g/cm³ 510 lb/ft³

Embodied Carbon

7.1 kg CO₂/kg material

Embodied Energy

96 MJ/kg 41 x 10³ BTU/lb

Embodied Water

240 L/kg 29 gal/lb

Common Calculations

PREN (Pitting Resistance)

Resilience: Ultimate (Unit Rupture Work)

270 MJ/m³

Resilience: Unit (Modulus of Resilience)

230 kJ/m³

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

25 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

3.1 mm²/s

Thermal Shock Resistance

14 points

Alloy Composition

Among wrought stainless steels, the composition of N08031 stainless steel is notable for containing comparatively high amounts of chromium (Cr) and nickel (Ni). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion.

Iron (Fe)Fe		29 to 36.9
Nickel (Ni)Ni		30 to 32
Chromium (Cr)Cr		26 to 28
Molybdenum (Mo)Mo		6.0 to 7.0
Copper (Cu)Cu		1.0 to 1.4
Manganese (Mn)Mn		0 to 2.0
Nitrogen (N)N		0.15 to 0.25
Silicon (Si)Si		0 to 0.3
Phosphorus (P)P		0 to 0.020
Carbon (C)C		0 to 0.015
Sulfur (S)S		0 to 0.010