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UNS N08926 (Alloy 926) Stainless Steel

N08926 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. N08926 is the UNS number for this material. Alloy 926 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 moderately high tensile strength among the wrought superaustenitic stainless steels in the database.

The graph bars on the material properties cards below compare N08926 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

200 GPa 30 x 10⁶ psi

Elongation at Break

40 %

Fatigue Strength

290 MPa 41 x 10³ psi

Poisson's Ratio

0.28

Shear Modulus

80 GPa 12 x 10⁶ psi

Shear Strength

500 MPa 73 x 10³ psi

Tensile Strength: Ultimate (UTS)

740 MPa 110 x 10³ psi

Tensile Strength: Yield (Proof)

330 MPa 48 x 10³ psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

420 °C 800 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1410 °C 2570 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 6.9 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

33 % relative

Density

8.1 g/cm³ 510 lb/ft³

Embodied Carbon

6.2 kg CO₂/kg material

Embodied Energy

84 MJ/kg 36 x 10³ BTU/lb

Embodied Water

200 L/kg 24 gal/lb

Common Calculations

PREN (Pitting Resistance)

Resilience: Ultimate (Unit Rupture Work)

240 MJ/m³

Resilience: Unit (Modulus of Resilience)

270 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

3.2 mm²/s

Thermal Shock Resistance

16 points

Alloy Composition

Among wrought stainless steels, the composition of N08926 stainless steel is notable for containing a comparatively high amount of nickel (Ni) and including copper (Cu). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion. Copper is used to improve resistance to acids, and to improve formability.

Iron (Fe)Fe		41.7 to 50.4
Nickel (Ni)Ni		24 to 26
Chromium (Cr)Cr		19 to 21
Molybdenum (Mo)Mo		6.0 to 7.0
Manganese (Mn)Mn		0 to 2.0
Copper (Cu)Cu		0.5 to 1.5
Silicon (Si)Si		0 to 0.5
Nitrogen (N)N		0.15 to 0.25
Phosphorus (P)P		0 to 0.030
Carbon (C)C		0 to 0.020
Sulfur (S)S		0 to 0.010