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UNS S82012 Stainless Steel

S82012 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 base cost among wrought duplex stainless steels. In addition, it has a very high ductility and a very low embodied energy.

The graph bars on the material properties cards below compare S82012 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

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

40 %

Fatigue Strength

480 MPa 70 x 103 psi

Poisson's Ratio

0.28

Rockwell C Hardness

27

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

550 MPa 79 x 103 psi

Tensile Strength: Ultimate (UTS)

800 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

560 MPa 81 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

420 °C 790 °F

Maximum Temperature: Mechanical

950 °C 1740 °F

Melting Completion (Liquidus)

1430 °C 2600 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

480 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.4 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

11 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

2.4 kg CO2/kg material

Embodied Energy

35 MJ/kg 15 x 103 BTU/lb

Embodied Water

140 L/kg 17 gal/lb

Common Calculations

PREN (Pitting Resistance)

24

Resilience: Ultimate (Unit Rupture Work)

290 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

29 points

Strength to Weight: Bending

25 points

Thermal Diffusivity

3.9 mm2/s

Thermal Shock Resistance

23 points

Alloy Composition

Among wrought stainless steels, the composition of S82012 stainless steel is notable for containing a comparatively high amount of manganese (Mn) and including copper (Cu). Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible. Copper is used to improve resistance to acids, and to improve formability.

Iron (Fe) 71.3 to 77.9
Chromium (Cr) 19 to 20.5
Manganese (Mn) 2.0 to 4.0
Nickel (Ni) 0.8 to 1.5
Copper (Cu) 0 to 1.0
Silicon (Si) 0 to 0.8
Molybdenum (Mo) 0.1 to 0.6
Nitrogen (N) 0.16 to 0.26
Carbon (C) 0 to 0.050
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.0050

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

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

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