317/317L Stainless Steel

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Best Stainless now stocks Stainless Steel 317 and 317L, enhanced with higher Chromium-Nickel-Molybdenum for improved properties.

  • Superior corrosion resistance over 316/316L stainless steel.
  • Increased molybdenum content aids in pitting and chemical corrosion resistance.
  • The 317L variant's reduced carbon content ensures better weldability and formability.
  • Non-magnetic in the annealed state and not hardenable by heat treatment.
  • Ideal for demanding environmental conditions.

Please contact Best Stainless for more information about how 317 SS can best suit your specific application.

stainless steel 316

Stainless Steel 317/317L Bar

Our stainless steel bar stock lengths range from the industry standard 12' to 28' long. For projects requiring long length stainless steel bar, our inventory ranges from 20’-28’ R/L.

  • 317/317L Round Bar (A-276, A-479)
  • 317/317L Pipe (ASTM A-312)
  • 317/317L Plate (ASTM A-240)

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317/317L Stainless Steel Physical Properties

Material TypeConditionTensile
Strength (PSI)
Strength (PSI)
(% in 2in.)
317/317L Annealed 75,000 minimum 30,000 minimum 30-45% minimum Quote »


  • Chemical Processing Equipment
  • Pulp and Paper Industry
  • Flue Gas Desulfurization Systems
  • Food Processing Equipment
  • Pharmaceuticals
  • Marine Applications

Chemical Composition

  • Chromium (Cr): 18.0% - 20.0%
  • Nickel (Ni): 11.0% - 15.0%
  • Molybdenum (Mo): 3.0% - 4.0%
  • Carbon (C): Max 0.08% (317L 0.03%)
  • Manganese (Mn): Max 2.0%
  • Silicon (Si): Max 1.0%
  • Phosphorus (P): Max 0.045%
  • Sulfur (S): Max 0.030%

Casting Alloy

  • UNS S31700 / S31703 - Unified Numbering System codes for 317 and 317L stainless steel, indicating chemical composition.
  • ASTM A182 - Standard for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves for high-temperature service.
  • ASTM A276 - Specification for hot-finished or cold-finished bars in stainless steel, including rounds, squares, and hexagons.
  • ASTM A479 - Standard for stainless steel bars and shapes for use in boilers and pressure vessels.

Cast Equivalents

  • CG8M (317) - Cast equivalent of 317 stainless steel, known for enhanced corrosion resistance.
  • CG3M (317L) - Low-carbon version of 317 in casting form, ideal for welding applications and high-temperature exposure.

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