UNS S31260 Stainless Steel
S31260 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 and a moderately low ductility among wrought duplex stainless steels.
The graph bars on the material properties cards below compare S31260 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 30 x 106 psi
Elongation at Break
23 %
Fatigue Strength
370 MPa 53 x 103 psi
Poisson's Ratio
0.27
Shear Modulus
80 GPa 12 x 106 psi
Shear Strength
500 MPa 72 x 103 psi
Tensile Strength: Ultimate (UTS)
790 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
540 MPa 79 x 103 psi
Thermal Properties
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
450 °C 840 °F
Maximum Temperature: Mechanical
1100 °C 2010 °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 9.2 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.5 % IACS
Otherwise Unclassified Properties
Base Metal Price
20 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
3.9 kg CO2/kg material
Embodied Energy
53 MJ/kg 23 x 103 BTU/lb
Embodied Water
180 L/kg 21 gal/lb
Common Calculations
PREN (Pitting Resistance)
39
Resilience: Ultimate (Unit Rupture Work)
160 MJ/m3
Resilience: Unit (Modulus of Resilience)
720 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
28 points
Strength to Weight: Bending
24 points
Thermal Diffusivity
4.3 mm2/s
Thermal Shock Resistance
22 points
Alloy Composition
Among wrought stainless steels, the composition of S31260 stainless steel is notable for including tungsten (W) and containing a comparatively high amount of chromium (Cr). Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.
| Fe | 59.6 to 67.6 | |
| Cr | 24 to 26 | |
| Ni | 5.5 to 7.5 | |
| Mo | 2.5 to 3.5 | |
| Mn | 0 to 1.0 | |
| Cu | 0.2 to 0.8 | |
| Si | 0 to 0.75 | |
| W | 0.1 to 0.5 | |
| N | 0.1 to 0.3 | |
| C | 0 to 0.030 | |
| P | 0 to 0.030 | |
| S | 0 to 0.030 |
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 A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
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