AISI 201 (S20100) Stainless Steel
AISI 201 stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. 201 is the AISI designation for this material. S20100 is the UNS number.
It has a moderately high electrical conductivity among wrought austenitic stainless steels. In addition, it has a moderately low base cost and a moderately low embodied energy.
The properties of AISI 201 stainless steel include six common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare AISI 201 stainless steel to: wrought austenitic 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
200 to 440
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
4.6 to 51 %
Fatigue Strength
280 to 600 MPa 40 to 88 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
450 to 840 MPa 66 to 120 x 103 psi
Tensile Strength: Ultimate (UTS)
650 to 1450 MPa 94 to 210 x 103 psi
Tensile Strength: Yield (Proof)
300 to 1080 MPa 44 to 160 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
410 °C 770 °F
Maximum Temperature: Mechanical
880 °C 1620 °F
Melting Completion (Liquidus)
1410 °C 2570 °F
Melting Onset (Solidus)
1370 °C 2500 °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
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.5 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.9 % IACS
Otherwise Unclassified Properties
Base Metal Price
12 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
2.6 kg CO2/kg material
Embodied Energy
38 MJ/kg 16 x 103 BTU/lb
Embodied Water
140 L/kg 17 gal/lb
Common Calculations
PREN (Pitting Resistance)
19
Resilience: Ultimate (Unit Rupture Work)
61 to 340 MJ/m3
Resilience: Unit (Modulus of Resilience)
230 to 2970 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
23 to 52 points
Strength to Weight: Bending
22 to 37 points
Thermal Diffusivity
4.0 mm2/s
Thermal Shock Resistance
14 to 32 points
Alloy Composition
Among wrought stainless steels, the composition of AISI 201 stainless steel is notable for containing a comparatively high amount of manganese (Mn). Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible.
| Fe | 67.5 to 75 | |
| Cr | 16 to 18 | |
| Mn | 5.5 to 7.5 | |
| Ni | 3.5 to 5.5 | |
| Si | 0 to 1.0 | |
| N | 0 to 0.25 | |
| C | 0 to 0.15 | |
| P | 0 to 0.060 | |
| S | 0 to 0.030 |
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
ASTM A666: Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar
ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
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
Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984
ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010