UNS S39274 Stainless Steel
S39274 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 ductility among wrought duplex stainless steels. In addition, it has a moderately high thermal conductivity and a fairly high base cost.
The graph bars on the material properties cards below compare S39274 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
270
Elastic (Young's, Tensile) Modulus
210 GPa 30 x 106 psi
Elongation at Break
17 %
Fatigue Strength
380 MPa 55 x 103 psi
Poisson's Ratio
0.27
Reduction in Area
34 %
Rockwell C Hardness
28
Shear Modulus
81 GPa 12 x 106 psi
Shear Strength
560 MPa 81 x 103 psi
Tensile Strength: Ultimate (UTS)
900 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
620 MPa 90 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)
1480 °C 2700 °F
Melting Onset (Solidus)
1430 °C 2610 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
16 W/m-K 9.1 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.4 % IACS
Otherwise Unclassified Properties
Base Metal Price
24 % relative
Density
8.0 g/cm3 500 lb/ft3
Embodied Carbon
4.3 kg CO2/kg material
Embodied Energy
60 MJ/kg 26 x 103 BTU/lb
Embodied Water
180 L/kg 21 gal/lb
Common Calculations
PREN (Pitting Resistance)
43
Resilience: Ultimate (Unit Rupture Work)
140 MJ/m3
Resilience: Unit (Modulus of Resilience)
940 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
32 points
Strength to Weight: Bending
26 points
Thermal Diffusivity
4.2 mm2/s
Thermal Shock Resistance
25 points
Alloy Composition
Among wrought stainless steels, the composition of S39274 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 | 57 to 65.6 | |
| Cr | 24 to 26 | |
| Ni | 6.0 to 8.0 | |
| Mo | 2.5 to 3.5 | |
| W | 1.5 to 2.5 | |
| Mn | 0 to 1.0 | |
| Cu | 0.2 to 0.8 | |
| Si | 0 to 0.8 | |
| N | 0.24 to 0.32 | |
| C | 0 to 0.030 | |
| P | 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
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 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 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