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AISI 317 (S31700) Stainless Steel

AISI 317 stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. 317 is the AISI designation for this material. S31700 is the UNS number. Additionally, the British Standard (BS) designation is 317S16.

The properties of AISI 317 stainless steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare AISI 317 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

170 to 220

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

35 to 55 %

Fatigue Strength

250 to 330 MPa 37 to 49 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

79 GPa 11 x 106 psi

Shear Strength

420 to 470 MPa 61 to 68 x 103 psi

Tensile Strength: Ultimate (UTS)

580 to 710 MPa 84 to 100 x 103 psi

Tensile Strength: Yield (Proof)

250 to 420 MPa 36 to 60 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

420 °C 790 °F

Maximum Temperature: Mechanical

590 °C 1090 °F

Melting Completion (Liquidus)

1400 °C 2550 °F

Melting Onset (Solidus)

1380 °C 2510 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.9 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

21 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

4.3 kg CO2/kg material

Embodied Energy

59 MJ/kg 25 x 103 BTU/lb

Embodied Water

160 L/kg 20 gal/lb

Common Calculations

PREN (Pitting Resistance)

31

Resilience: Ultimate (Unit Rupture Work)

210 to 260 MJ/m3

Resilience: Unit (Modulus of Resilience)

150 to 430 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

20 to 25 points

Strength to Weight: Bending

20 to 22 points

Thermal Diffusivity

4.1 mm2/s

Thermal Shock Resistance

12 to 15 points

Alloy Composition

Among wrought stainless steels, the composition of AISI 317 stainless steel is notable for containing comparatively high amounts of nickel (Ni) and chromium (Cr). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.

Iron (Fe) 58 to 68
Chromium (Cr) 18 to 20
Nickel (Ni) 11 to 15
Molybdenum (Mo) 3.0 to 4.0
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 0.75
Nitrogen (N) 0 to 0.1
Carbon (C) 0 to 0.080
Phosphorus (P) 0 to 0.045
Sulfur (S) 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

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 A276: Standard Specification for Stainless Steel Bars and Shapes

Creep-Resistant Steels, Fujio Abe et al. (editors), 2008

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

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

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