S.S. 317 / 317L

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UNS - S31700 / S31703

Type 317 317 is an austenitic chromium-nickel stainless steel with phenomenal corrosion resistance; its high Molybdenum content improves the grade´s superior pitting resistance.

It is the most corrosion resistant of the 300 series alloys and possesses the highest tensile and creep strength properties at high temperatures.

Type 317L is a low carbon austenitic chromium-nickel stainless steel that can be utilized in applications where it is not possible to anneal after welding and where maximum corrosion resistance is needed. It gives good oxidation resistance in intermittent service to 1600°F and in continuous service to 1700°F.

  • Improved general and localized corrosion to 316L stainless
  • Good formability
  • Good weldability

  • Air Pollution Control — flue gas desulfurization systems (FGD)
  • Chemical and Petrochemical Processing
  • Explosives
  • Food and Beverage Processing
  • Petroleum Refining
  • Power Generation — condensers
  • Pulp and Paper


To work harden low speeds and heavy feeds will minimize this alloy’s tendency. It is tougher than 304 stainless steels with long stringy chips. The utilization of chip breakers is recommended.


All common fusion and resistance process aside from oxyacetylene welding have proven successful.

Hot Working

All common hot working processis possible with this alloy. Heat to 2100-2300 F (1149-1260 C). Avoid working this material beneath 1700 F (927 C). For ideal corrosion resistance, a post-work annealing is recommended.

Cold Working

This alloy can be successfully performed with the help of shearing, stamping, heading and drawing. To remove internal stresses, a post-work annealing is recommended.


1850-2050 F (1010-1121 C) followed by fast cooling.


These alloys do not reply to heat treatment. Cold work will cause an increase in both hardness and strength.

Chemical Composition %

GradeCNSiPS CrMnNiMoFe
317 0.08 max0.1 max0.75 max0.045 max0.03 max18.0 - 20.02.0 max11.0 - 15.03.0 - 4.0 Remainder
317L 0.03 max0.1 max0.75 max0.045 max0.03 max18.0 - 20.02.0 max11.0 - 15.03.0 - 4.0Remainder

Mechanical Properties

GradeTensile Strength (ksi)0.2% Yield Strength (ksi)Elongation% in 2 inches

Physical Properties

317317LTemperature in °C
Density7.99 g/cm³7.99 g/cm³Room
Specific Heat0.12 Kcal/kg.C0.12 Kcal/kg.C22°
Melting Range1371 - 1421 °C1371 - 1421 °C-
Modulus of Elasticity 193 KN/mm²193 KN/mm²20°
Electrical Resistivity74 µΩ.cm79 µΩ.cmRoom
Coefficient of Expansion16.0 µm/m °C16.0 µm/m °C20 - 100°
Thermal Conductivity16.2 W/m -°K16.2 W/m -°K20°

ASTM Specifications

Pipe / Tube (SMLS)Sheet / PlateBarForgingFitting
A 213, A 249A 167, A 240A 276 A 182A403


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