Stainless Steel Capillary Tubes 317L Wst. 1.4438 UNS S31703:-

 ASTM A 213/ASME SA 213
EN 10216-5/EN 10305/ISO 15156-3
NACE MR0175/PED 97/23 EC
Maximum service temperature: 430°C / 800°F 

317L is an molybdenum-bearing austenitic stainless steel, with greatly increased resistance to chemical attack as composed to the conventional chromium-nickel austenitic steel tubes as 304L & 316L. The addition of molybdenum gives alloy 317L tubing improved resistance to chloride and other halides. Due to its low carbon content the 317L tubing can be welded without risk of sanitization due to inter granular corrosion that can result  from chromium carbide precipitation in the grain boundaries. 317L is non magnetic in the annealed condition, but may become slightly magnetic as result of welding.


  • Resistance to sensitization during welding
  • Higher creeps, stress-to-rapture and tensile strength at elevated temperatures
  • Corrosion and pitting resistance
  • Resistance in acidic and hand water areas

Market applications:

  • Offshore, oil & gas
  • Chemical
  • Hydraulic 
  • Shipbuilding
  • Refining
  • Pulp and paper

Technical Data Sheet

Technical composition (%) Fe Cr Ni Mo Mn Si P C S
317 min Bal. 18.0 11.0 3.0 - - - - -
max - 20.0 15.0 4.0 2.00 1.00 0.040 0.035 0.030

Mechanical Properties 317L
Tensile strenght (mpa, min) 515 - 750
Yield strength (0.2% offset mpa, min) 205
Elongation (%, min) 35
Density / weight (g / cm3 / kg) 7.90

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