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UNS N08925 Stainless Steel

N08925 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition.

It has a moderately high thermal conductivity and a moderately high ductility among wrought superaustenitic stainless steels.

The graph bars on the material properties cards below compare N08925 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

45 %

Fatigue Strength

310 MPa 45 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

80 GPa 12 x 106 psi

Shear Strength

470 MPa 69 x 103 psi

Tensile Strength: Ultimate (UTS)

680 MPa 98 x 103 psi

Tensile Strength: Yield (Proof)

340 MPa 49 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

13 W/m-K 7.6 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)

44

Resilience: Ultimate (Unit Rupture Work)

250 MJ/m3

Resilience: Unit (Modulus of Resilience)

280 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

23 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

3.5 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Among wrought stainless steels, the composition of N08925 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) 42.7 to 50.1
Nickel (Ni) 24 to 26
Chromium (Cr) 19 to 21
Molybdenum (Mo) 6.0 to 7.0
Copper (Cu) 0.8 to 1.5
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 0.5
Nitrogen (N) 0.1 to 0.2
Phosphorus (P) 0 to 0.045
Sulfur (S) 0 to 0.030
Carbon (C) 0 to 0.020

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

Followup Questions

Similar Alloys

Further Reading

ASTM B673: Standard Specification for UNS N08904, UNS N08925, and UNS N08926 Welded Pipe

ASTM B674: Standard Specification for UNS N08904, UNS N08925, and UNS N08926 Welded Tube

ASTM B677: Standard Specification for UNS N08904, UNS N08925, and UNS N08926 Seamless Pipe and Tube

ASTM B649: Standard Specification for Ni-Fe-Cr-Mo-Cu Low-Carbon Alloy (UNS N08904), Ni-Fe-Cr-Mo-Cu-N Low-Carbon Alloys (UNS N08925, UNS N08031, and UNS N08926), and Cr-Ni-Fe-N Low-Carbon Alloy (UNS R20033) Bar and Wire

Nickel Alloys, Ulrich Heubner (editor), 1998

ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010