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UNS S32050 Stainless Steel

S32050 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition.

It has a fairly high ductility among wrought superaustenitic stainless steels. In addition, it has a moderately high electrical conductivity and a moderately low base cost.

The graph bars on the material properties cards below compare S32050 stainless steel to: wrought superaustenitic 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

220

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

46 %

Fatigue Strength

340 MPa 50 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

81 GPa 12 x 106 psi

Shear Strength

540 MPa 78 x 103 psi

Tensile Strength: Ultimate (UTS)

770 MPa 110 x 103 psi

Tensile Strength: Yield (Proof)

370 MPa 54 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

440 °C 820 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1460 °C 2650 °F

Melting Onset (Solidus)

1410 °C 2560 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 7.2 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

6.0 kg CO2/kg material

Embodied Energy

81 MJ/kg 35 x 103 BTU/lb

Embodied Water

210 L/kg 25 gal/lb

Common Calculations

PREN (Pitting Resistance)

48

Resilience: Ultimate (Unit Rupture Work)

290 MJ/m3

Resilience: Unit (Modulus of Resilience)

330 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

27 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

3.3 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among wrought stainless steels, the composition of S32050 stainless steel is notable for containing comparatively high amounts of chromium (Cr) and nickel (Ni). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion.

Iron (Fe) 43.1 to 51.8
Chromium (Cr) 22 to 24
Nickel (Ni) 20 to 23
Molybdenum (Mo) 6.0 to 6.6
Manganese (Mn) 0 to 1.5
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.21 to 0.32
Copper (Cu) 0 to 0.4
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

ASTM A479: Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels

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 Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010