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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.

Iron (Fe) 56.8 to 64.3
Chromium (Cr) 24 to 26
Nickel (Ni) 6.5 to 8.0
Molybdenum (Mo) 3.0 to 4.0
Copper (Cu) 1.2 to 2.0
Tungsten (W) 0.8 to 1.2
Manganese (Mn) 0 to 0.8
Silicon (Si) 0 to 0.8
Nitrogen (N) 0.23 to 0.33
Carbon (C) 0 to 0.025
Phosphorus (P) 0 to 0.025
Sulfur (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