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UNS S31803 Stainless Steel

S31803 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 moderately high thermal conductivity among wrought duplex stainless steels. In addition, it has a moderately low tensile strength and a moderately high ductility.

The graph bars on the material properties cards below compare S31803 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

260

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

29 %

Fatigue Strength

370 MPa 54 x 103 psi

Poisson's Ratio

0.27

Reduction in Area

50 %

Rockwell C Hardness

27

Shear Modulus

80 GPa 12 x 106 psi

Shear Strength

460 MPa 67 x 103 psi

Tensile Strength: Ultimate (UTS)

710 MPa 100 x 103 psi

Tensile Strength: Yield (Proof)

500 MPa 73 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

430 °C 810 °F

Maximum Temperature: Mechanical

1060 °C 1940 °F

Melting Completion (Liquidus)

1450 °C 2640 °F

Melting Onset (Solidus)

1400 °C 2560 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

16 W/m-K 9.3 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

17 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

3.6 kg CO2/kg material

Embodied Energy

49 MJ/kg 21 x 103 BTU/lb

Embodied Water

160 L/kg 19 gal/lb

Common Calculations

PREN (Pitting Resistance)

34

Resilience: Ultimate (Unit Rupture Work)

180 MJ/m3

Resilience: Unit (Modulus of Resilience)

630 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

25 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

4.3 mm2/s

Thermal Shock Resistance

20 points

Alloy Composition

Among wrought stainless steels, the composition of S31803 stainless steel is notable for containing a comparatively high amount of chromium (Cr). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.

Iron (Fe) 63.7 to 71.9
Chromium (Cr) 21 to 23
Nickel (Ni) 4.5 to 6.5
Molybdenum (Mo) 2.5 to 3.5
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.080 to 0.2
Carbon (C) 0 to 0.030
Phosphorus (P) 0 to 0.030
Sulfur (S) 0 to 0.020

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

ASTM A479: Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels

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

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015