317LM Stainless Steel Plate - UNS S31725 (Low Carbon, High Molybdenum)

317LM is a low carbon, high molybdenum austenitic stainless steel with a higher nickel content than 317L.  317LM has high resistance to phosphoric and sulfuric acid compounds, and maintains good fabricability and mechanical properties. 

317LM Inventory Size Ranges


0.625" - 1.250"

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Our 317LM plate is ideal for cutting and machining.  When machining 317LM, low speed and constant feeds can be used to reduce work hardening.  Chip breakers may be useful as the high ductility of this grade can form long chips around cutting tools.  Forming requires a significantly higher force than standard stainless steel grades, and it must be cut through the entire thickness.  Ask about our full service cutting services for our 317LM plate stock.

Welding may be done through conventional methods, as the low carbon content of this grade allows it to maintain corrosion resistance and reduce stress corrosion cracking.  317L can be used as filler material when required. 

317LM stainless steel cannot be hardened by typical heat treatments and must be cold worked to harden and strengthen. 

Standard Inventory Specifications

  • UNS S31725 - 317LM
  • ASTM A 240
  • ASTM A182
  • ASTM A167
  • ASME SA 240

Common Applications of 317LM

  • Flue gas scrubbers for desulfurization systems
  • Petrochemical processing
  • Chemical processing – sulfuric, hydrochloric, phosphoric, and chlorine rich environments
  • Pulp and paper mills
  • Pharmaceutical Processing

Chemical Composition

317LM Chemical Composition
Element Percent by Weight
C Carbon 3.00
Mn Manganese 200.0
Si Silicon 100.00
Cr Chromium 18.00 - 20.00
Ni Nickel 12.00 - 16.00
Mo Molybdenum 4.00 - 4.500
P Phosphorous 4.50
S Sulfur 003
N Nitrogen --
Fe Iron Balance
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Physical Properties of 317LM Stainless Steel



Density lb/in3


Thermal Conductivity, Btu/ft hr°F


Electrical Resistivity, Ω-inch

33.5 x 10- 6

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Mechanical Properties of 317LM Stainless Steel




Ultimate Tensile Strength, ksi


75 min

0.2% Offset Yield Strength, ksi


30 min

Elongation in 2 inches, %


40 min

Hardness, Rockwell B


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.