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UNS S32808 Stainless Steel

S32808 stainless steel is a duplex stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition.

It has a fairly low ductility among wrought duplex stainless steels. In addition, it has a fairly high base cost and a fairly low thermal conductivity.

The graph bars on the material properties cards below compare S32808 stainless steel to: wrought duplex 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

270

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

17 %

Fatigue Strength

350 MPa 50 x 103 psi

Poisson's Ratio

0.27

Rockwell C Hardness

28

Shear Modulus

81 GPa 12 x 106 psi

Shear Strength

480 MPa 70 x 103 psi

Tensile Strength: Ultimate (UTS)

780 MPa 110 x 103 psi

Tensile Strength: Yield (Proof)

570 MPa 83 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

460 °C 860 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1470 °C 2680 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

14 W/m-K 8.2 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

24 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

4.0 kg CO2/kg material

Embodied Energy

57 MJ/kg 25 x 103 BTU/lb

Embodied Water

180 L/kg 22 gal/lb

Common Calculations

PREN (Pitting Resistance)

40

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

790 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

27 points

Strength to Weight: Bending

24 points

Thermal Diffusivity

3.8 mm2/s

Thermal Shock Resistance

21 points

Alloy Composition

Among wrought stainless steels, the composition of S32808 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including tungsten (W). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects.

Iron (Fe) 58.1 to 62.8
Chromium (Cr) 27 to 27.9
Nickel (Ni) 7.0 to 8.2
Tungsten (W) 2.1 to 2.5
Molybdenum (Mo) 0.8 to 1.2
Manganese (Mn) 0 to 1.1
Nitrogen (N) 0.3 to 0.4
Silicon (Si) 0 to 0.5
Carbon (C) 0 to 0.030
Phosphorus (P) 0 to 0.030
Sulfur (S) 0 to 0.010

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

Followup Questions

Similar Alloys

Further Reading

Duplex Stainless Steels, Iris Alvarez-Armas and Suzanne Degallaix-Moreuil (editors), 2009

Duplex Stainless Steels: Microstructure, Properties and Applications, Robert N. Gunn (editor), 1997

Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016

ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

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

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

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

Corrosion of Stainless Steels, A. John Sedriks, 1996

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

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