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.
| Fe | 71.3 to 77.9 | |
| Cr | 19 to 20.5 | |
| Mn | 2.0 to 4.0 | |
| Ni | 0.8 to 1.5 | |
| Cu | 0 to 1.0 | |
| Si | 0 to 0.8 | |
| Mo | 0.1 to 0.6 | |
| N | 0.16 to 0.26 | |
| C | 0 to 0.050 | |
| P | 0 to 0.040 | |
| 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