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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.

Iron (Fe) 34.1 to 46
Chromium (Cr) 23 to 25
Nickel (Ni) 21 to 24
Molybdenum (Mo) 5.2 to 6.2
Manganese (Mn) 2.0 to 4.0
Tungsten (W) 1.5 to 2.5
Copper (Cu) 1.0 to 2.5
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.35 to 0.6
Phosphorus (P) 0 to 0.035
Carbon (C) 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

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