UNS S39277 Stainless Steel
S39277 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 very high tensile strength among wrought duplex stainless steels. In addition, it has a moderately high thermal conductivity and a fairly high embodied energy.
The graph bars on the material properties cards below compare S39277 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
250
Elastic (Young's, Tensile) Modulus
200 GPa 30 x 106 psi
Elongation at Break
28 %
Fatigue Strength
480 MPa 70 x 103 psi
Poisson's Ratio
0.27
Reduction in Area
57 %
Shear Modulus
80 GPa 12 x 106 psi
Shear Strength
600 MPa 87 x 103 psi
Tensile Strength: Ultimate (UTS)
930 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
660 MPa 96 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)
1460 °C 2660 °F
Melting Onset (Solidus)
1410 °C 2580 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
16 W/m-K 9.0 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
23 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
4.2 kg CO2/kg material
Embodied Energy
59 MJ/kg 25 x 103 BTU/lb
Embodied Water
180 L/kg 22 gal/lb
Common Calculations
PREN (Pitting Resistance)
43
Resilience: Ultimate (Unit Rupture Work)
240 MJ/m3
Resilience: Unit (Modulus of Resilience)
1070 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
33 points
Strength to Weight: Bending
27 points
Thermal Diffusivity
4.2 mm2/s
Thermal Shock Resistance
26 points
Alloy Composition
Among wrought stainless steels, the composition of S39277 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 | 56.8 to 64.3 | |
| Cr | 24 to 26 | |
| Ni | 6.5 to 8.0 | |
| Mo | 3.0 to 4.0 | |
| Cu | 1.2 to 2.0 | |
| W | 0.8 to 1.2 | |
| Mn | 0 to 0.8 | |
| Si | 0 to 0.8 | |
| N | 0.23 to 0.33 | |
| C | 0 to 0.025 | |
| P | 0 to 0.025 | |
| S | 0 to 0.0020 |
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 A479: Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005
ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
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