317 Stainless Steel Supply

Introduction

Stainless steel 317L is a molybdenum containing, low carbon austenitic stainless steel. Due to its low carbon content, Stainless steel 317L also provides resistance to sensitization when welded and higher creep, stress to rupture, and tensile strength at elevated temperatures. It is non-magnetic in the annealed condition but may become slightly magnetic after welding.

Grade Specification Comparison of 317L stainless steel

GBISCCNSJISKSASTMUNSISO
022Cr19Ni13Mo3S31703317LSUS 317LSTS 317L317LS31703X2CrNiMo 19-14-4
(00Cr19Ni13Mo3)X2CrNiMo18-15-4
DIN EN/DINW-Nr.NF EN/NFENGradeGOSTSSBS EN/BS
X2CrNiMo 18-15-41.4438Z2CND 19-15X2CrNiMo 18-15-41.443803Х16Н15М32367317S12
(X2CrNiMo 18-16)Z3CND 19-15-04317S11

Type 317L Stainless Steel Properties

The 317L stainless steel provides improved resistance relative to 316L in strongly corrosive environments containing sulfurous media, chlorides, and other halides.

The low carbon content of 317L stainless steel enables it to be welded without intergranular corrosion resulting from chromium carbide precipitation enabling it to be used in the as-welded condition. With the addition of nitrogen as a strengthening agent, the alloy can be dual certified as 317 stainless steel (UNS S31700).

317L stainless steel is non-magnetic in the annealed condition. It cannot be hardened by heat treatment, however the material will harden due to cold working. 317L stainless steel can be easily welded and processed by standard shop fabrication practices.

Chemical Composition of 317L stainless steel

ElementCSiMnPSCrNiMo
Min-----18113
Max0.03120.0450.0320154

Physical Properties of 317L stainless steel

Melting PointDensitySpecific GravityModulus of Elasticity
in Tension
  2540 – 2630°F  1390 – 1440°C  0.285 lbs / in3  7.89 g /cm3  7.98  29.0 x 106 psi  200 GPa

Mechanical Properties of 317L stainless steel

AlloyTemperTensile StrengthYield Strength% ElongationNotes
MinimumMinimum 0.2% offsetin 2" Minimum
(psi)(psi) 
317Annealed75,00030,00040%-

Surface Finish Options of 317L stainless steel

Popular finish options include:

  • Also cold-rolled, the 2D finish has a matte surface with low reflectivity.
  • HR / No.1 . This hot-rolled finish has a scaled appearance and so is ideal where the final aesthetic is not an important concern.
  • BA / 2R. Cold rolled, annealed in a controlled atmosphere to retain a highly reflective finish.
  • Smooth finish, reflective grey sheen.

317L Stainless Steel Applications

317L stainless steel is a low-carbon, molybdenum-containing austenitic stainless steel with enhanced corrosion resistance. Here are some common applications of 317L stainless steel:

  1. Chemical Processing Equipment: 317L stainless steel is widely used in the chemical processing industry for equipment such as reactors, vessels, and piping systems where resistance to corrosive chemicals is crucial.
  2. Pulp and Paper Industry: Components in the pulp and paper industry, including digesters, bleach washers, and paper processing equipment, may be made from 317L stainless steel due to its corrosion resistance.
  3. Oil and Gas Industry: 317L stainless steel is used in the oil and gas industry for equipment such as pipelines, valves, and offshore platforms, especially in environments with corrosive substances.
  4. Food Processing Equipment: In the food and beverage industry, 317L stainless steel is employed for equipment such as tanks, pipes, and processing machinery where corrosion resistance and hygiene are essential.
  5. Pharmaceutical Industry: Equipment in the pharmaceutical industry, including reactors, storage tanks, and piping systems, may use 317L stainless steel due to its corrosion resistance and suitability for cleanroom environments.
  6. Desalination Plants: Components in desalination plants, such as evaporators and heat exchangers, may be made from 317L stainless steel for its resistance to chloride-induced corrosion.
  7. Textile Industry: 317L stainless steel is used in the textile industry for components such as dyeing equipment, pipes, and fittings, where resistance to corrosive chemicals is necessary.
  8. Flue Gas Desulfurization Systems: Due to its corrosion resistance in sulfuric acid environments, 317L stainless steel is used in flue gas desulfurization systems for coal-fired power plants.
  9. Aerospace Applications: Certain aerospace components that require corrosion resistance in aggressive environments may use 317L stainless steel.
  10. Medical Devices: In the medical field, 317L stainless steel may be used for certain medical devices and equipment that require corrosion resistance and biocompatibility.

Processing

  • WELDING

Stainless steel 317L can be readily welded by most standard processes. A post weld heat treatment is not necessary

  • Machinability

Low speeds and constant feeds will minimize this alloy’s tendency to work harden.

Tougher than 304 stainless with a long stringy chip, the use of chip breakers is recommended

FAQ

What Makes Grade 317 SS Different from 304 & 316 SS?

Grade 304, 316, and 317 stainless steel are all considered austenitic stainless steel alloys. These alloys all share some similar properties, such as high strength, corrosion resistance, and high concentrations of chromium and nickel.

What separates 316 and 317 SS from 304 SS is that these higher-numbered alloys have added molybdenum in their formulation—grade 316 has about 2-3% molybdenum, and grade 317 has more than 3% molybdenum.

This added molybdenum greatly improves the steel’s resistance to pitting from chlorides, which is why grade 316 SS is often used in the chemical processing and marine industries.

However, this added molybdenum content also influences the cost of these two alloys. Grade 317 SS is generally more expensive than grade 316 SS. 316 SS, in turn, is more expensive than grade 304 SS. The exact extra cost varies based on the market at the time.