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UNS N08320 Stainless Steel

N08320 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition.

It has a very low base cost among wrought superaustenitic stainless steels. In addition, it has the lowest embodied energy and a moderately low tensile strength.

The graph bars on the material properties cards below compare N08320 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

Brinell Hardness

190

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

40 %

Fatigue Strength

190 MPa 27 x 103 psi

Poisson's Ratio

0.28

Rockwell B Hardness

84

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

400 MPa 58 x 103 psi

Tensile Strength: Ultimate (UTS)

580 MPa 85 x 103 psi

Tensile Strength: Yield (Proof)

220 MPa 32 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

430 °C 810 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1400 °C 2550 °F

Melting Onset (Solidus)

1350 °C 2470 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 7.2 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

4.9 kg CO2/kg material

Embodied Energy

69 MJ/kg 30 x 103 BTU/lb

Embodied Water

200 L/kg 24 gal/lb

Common Calculations

PREN (Pitting Resistance)

22

Resilience: Ultimate (Unit Rupture Work)

180 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

3.3 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Among wrought stainless steels, the composition of N08320 stainless steel is notable for containing comparatively high amounts of manganese (Mn) and nickel (Ni). Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible. 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) 40.4 to 50
Nickel (Ni) 25 to 27
Chromium (Cr) 21 to 23
Manganese (Mn) 0 to 2.5
Silicon (Si) 0 to 1.0
Carbon (C) 0 to 0.050
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.030

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

Followup Questions

Similar Alloys

Further Reading

ASTM B620: Standard Specification for Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320) Plate, Sheet, and Strip

ASTM B621: Standard Specification for Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320) Rod

ASTM B619: Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe

ASTM B626: Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Tube

ASTM B622: Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube

Nickel Alloys, Ulrich Heubner (editor), 1998

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

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