317L Stainless Steel Plate – UNS S31703

Alloy 317L is a low-carbon, high molybdenum austenitic stainless steel with a higher nickel alloy content than 316L.  Developed to resist the attack of sulfuric acid compounds, this alloy combines good corrosion resistance with excellent mechanical properties and ease of fabrication.  These alloys are frequently used for flue gas desulfurization services in fossil-fuel power plants.  Compared to other austenitic stainless steels, 317L offers a higher creep strength, stress to rupture, and tensile strength at elevated temperatures. 


317L Inventory Size Ranges

Plate

0.625" - 1.250"

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Custom Strip

0.0008" - 0.012"

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The higher molybdenum and chromium content of 317L provides excellent corrosion resistance compared to stainless steel grades like 304 or 316, and it resists phosphoric acid, sulfuric acid, and chloride pitting/crevice corrosion.  The low carbon content of this grade of 317 also provides resistance to sensitization during welding, which allows it to maintain its corrosion resistance at grain boundaries and prevent intergranular stress corrosion cracking. 

While 317L cannot be hardened by heat treatment, it can be cold worked.


Standard Inventory Specifications

  • UNS S31703 - 317L
  • ASTM A 240
  • ASTM A182
  • ASTM A167
  • ASME SA 240

Common Applications of 317L

  • Flue gas desulfurization systems found in fossil fuel plants
  • Chemical and Petrochemical Processing
  • Food and Beverage Processing
  • Power Generation — condensers
  • Pulp and Paper Processing
  • Textiles with acid dyes

Features

  • Good corrosion resistance
  • Good mechanical properties
  • Ease of fabrication
  • Produces stronger welds due to lower carbon content
  • Resists the attack of sulfuric acid compounds

Chemical Composition

317L Chemical Composition
Element Percent by Weight
C Carbon 3.00%
Mn Manganese 200.00%
Si Silicon 100.00%
Cr Chromium 18.00 - 20.00
Ni Nickel 11.00 - 15.00
Mo Molybdenum 17.00 - 19.00
P Phosphorus 4.50%
S Sulfur 0.03
N Nitrogen --
Fe Iron Balance
317LM Chemical Composition
Element Percent by Weight
C Carbon 3.00%
Mn Manganese 200.00%
Si Silicon 100.00%
Cr Chromium 18.00 - 20.00
Ni Nickel 12.00 - 16.00
Mo Molybdenum 4.00 - 4.5.00
P Phosphorus 4.50%
S Sulfur 0.03
N Nitrogen --
Fe Iron Balance
317LMN Chemical Composition
Element Percent by Weight
C Carbon 3.00%
Mn Manganese 200.00%
Si Silicon 75.00%
Cr Chromium 17.00 - 20.00
Ni Nickel 13.70 - 17.50
Mo Molybdenum 4.00 - 5.00
P Phosphorus 4.50%
S Sulfur 0.03
N Nitrogen 0.1 - 0.2
Fe Iron Balance
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Physical Properties of 317L Stainless Steel

Property

Value

Density lb/in3

0.285

Thermal Conductivity, Btu/ft hr°F

8.7

Electrical Resistivity, Ω-inch

33.5 x 10- 6

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Mechanical Properties of 317L Stainless Steel

Property

Value

ASTM

Ultimate Tensile Strength, ksi

89

75 min

0.2% Offset Yield Strength, ksi

46

30 min

Elongation in 2 inches, %

53

40 min

Hardness, Rockwell B

80

95 max

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*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.