UNS S32950 Stainless Steel
S32950 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 moderately low electrical conductivity.
The graph bars on the material properties cards below compare S32950 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
17 %
Fatigue Strength
330 MPa 48 x 103 psi
Poisson's Ratio
0.27
Rockwell C Hardness
28
Shear Modulus
80 GPa 12 x 106 psi
Shear Strength
480 MPa 70 x 103 psi
Tensile Strength: Ultimate (UTS)
780 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
550 MPa 79 x 103 psi
Thermal Properties
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
460 °C 860 °F
Maximum Temperature: Mechanical
1100 °C 2010 °F
Melting Completion (Liquidus)
1430 °C 2610 °F
Melting Onset (Solidus)
1390 °C 2530 °F
Specific Heat Capacity
480 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
16 W/m-K 9.3 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.1 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.5 % IACS
Otherwise Unclassified Properties
Base Metal Price
17 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
3.4 kg CO2/kg material
Embodied Energy
47 MJ/kg 20 x 103 BTU/lb
Embodied Water
180 L/kg 21 gal/lb
Common Calculations
PREN (Pitting Resistance)
37
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
730 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
21 points
Alloy Composition
Among wrought stainless steels, the composition of S32950 stainless steel is notable for containing a comparatively high amount of chromium (Cr). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.
| Fe | 60.3 to 69.4 | |
| Cr | 26 to 29 | |
| Ni | 3.5 to 5.2 | |
| Mo | 1.0 to 2.5 | |
| Mn | 0 to 2.0 | |
| Si | 0 to 0.6 | |
| N | 0.15 to 0.35 | |
| P | 0 to 0.035 | |
| C | 0 to 0.030 | |
| S | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM A473: Standard Specification for Stainless Steel Forgings
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
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
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