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UNS S32750 (Alloy 2507) Stainless Steel

S32750 stainless steel is a duplex stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. S32750 is the UNS number for this material. Alloy 2507 is the common industry name.

It has a fairly low ductility among wrought duplex stainless steels. In addition, it has a moderately high tensile strength and a moderately high base cost.

The graph bars on the material properties cards below compare S32750 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

360 MPa 52 x 103 psi

Poisson's Ratio

0.27

Rockwell C Hardness

28

Shear Modulus

81 GPa 12 x 106 psi

Shear Strength

530 MPa 77 x 103 psi

Tensile Strength: Ultimate (UTS)

860 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

590 MPa 86 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)

1450 °C 2640 °F

Melting Onset (Solidus)

1400 °C 2560 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.7 BTU/h-ft-°F

Thermal Expansion

12 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

21 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

4.1 kg CO2/kg material

Embodied Energy

56 MJ/kg 24 x 103 BTU/lb

Embodied Water

180 L/kg 21 gal/lb

Common Calculations

PREN (Pitting Resistance)

43

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

860 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

31 points

Strength to Weight: Bending

26 points

Thermal Diffusivity

4.0 mm2/s

Thermal Shock Resistance

25 points

Alloy Composition

Among wrought stainless steels, the composition of S32750 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including copper (Cu). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Copper is used to improve resistance to acids, and to improve formability.

Iron (Fe) 58.1 to 66.8
Chromium (Cr) 24 to 26
Nickel (Ni) 6.0 to 8.0
Molybdenum (Mo) 3.0 to 5.0
Manganese (Mn) 0 to 1.2
Silicon (Si) 0 to 0.8
Nitrogen (N) 0.24 to 0.32
Copper (Cu) 0 to 0.5
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

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

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