UNS S31266 Stainless Steel
S31266 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition.
It has a moderately high base cost among wrought superaustenitic stainless steels. In addition, it has a fairly high tensile strength and a moderately high embodied energy.
The graph bars on the material properties cards below compare S31266 stainless steel to: wrought superaustenitic 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
210 GPa 30 x 106 psi
Elongation at Break
40 %
Fatigue Strength
400 MPa 59 x 103 psi
Poisson's Ratio
0.28
Reduction in Area
56 %
Shear Modulus
81 GPa 12 x 106 psi
Shear Strength
590 MPa 85 x 103 psi
Tensile Strength: Ultimate (UTS)
860 MPa 120 x 103 psi
Tensile Strength: Yield (Proof)
470 MPa 68 x 103 psi
Thermal Properties
Latent Heat of Fusion
310 J/g
Maximum Temperature: Corrosion
440 °C 830 °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
460 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
12 W/m-K 6.8 BTU/h-ft-°F
Thermal Expansion
16 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.8 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.0 % IACS
Otherwise Unclassified Properties
Base Metal Price
37 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
6.5 kg CO2/kg material
Embodied Energy
89 MJ/kg 38 x 103 BTU/lb
Embodied Water
220 L/kg 26 gal/lb
Common Calculations
PREN (Pitting Resistance)
54
Resilience: Ultimate (Unit Rupture Work)
290 MJ/m3
Resilience: Unit (Modulus of Resilience)
540 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
29 points
Strength to Weight: Bending
24 points
Thermal Diffusivity
3.1 mm2/s
Thermal Shock Resistance
18 points
Alloy Composition
Among wrought stainless steels, the composition of S31266 stainless steel is notable for including tungsten (W) and containing a comparatively high amount of manganese (Mn). Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects. Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible.
| Fe | 34.1 to 46 | |
| Cr | 23 to 25 | |
| Ni | 21 to 24 | |
| Mo | 5.2 to 6.2 | |
| Mn | 2.0 to 4.0 | |
| W | 1.5 to 2.5 | |
| Cu | 1.0 to 2.5 | |
| Si | 0 to 1.0 | |
| N | 0.35 to 0.6 | |
| P | 0 to 0.035 | |
| C | 0 to 0.030 | |
| S | 0 to 0.020 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
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
ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002
Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984
Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993
ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010