UNS S31703
Forms of 317L Stainless Steel Available
• Sheet
• Plate
• Bar
• Pipe & Tube (welded & seamless)
• Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
• Welding Wire and Welding Electrode
317L Stainless Steel Overview
317L is a molybdenum bearing, low carbon content "L" grade austenitic stainless steel that provides improved corrosion resistance over 304L and 316L stainless steels. The low carbon provides resistance to sensitization during welding and other thermal processes.
317L is non-magnetic in the annealed condition but may become slightly magnetic as a result of welding.
Corrosion Resistance
317L has excellent corrosion resistance in a wide range of chemicals, especially in acidic chloride environments such as those encountered in pulp and paper mills. Increased levels of chromium, nickel and molybdenum compared to 316L stainless steel improve resistance to chloride pitting and general corrosion. Resistance increases with molybdenum alloy content. 317L is resistant to sulfuric acid concentrations up to 5 percent at temperatures as high as 120° F(49° C). At temperatures under 10° F(38° C) this alloy has excellent resistance to solutions of higher concentration. However, service tests are recommended to account for the affects of specific operating conditions that may affect corrosion behavior. In processes where condensation of sulfur-bearing gases occurs, 317L is much more resistant to attack at the point of condensation than conventional alloy 316. The acid concentration has a marked influence on the rate of attack in such environments and should be carefully determined by service tests.
Chemical Composition, %
| Ni | Cr | Mo | Mn | Si |
| 11.0 - 15.0 | 18.0 - 20.0 | 3.0 - 4.0 | 2.0 Max | .75 Max |
| C | N | S | P | Fe |
| 0.03 Max | 0.1 Max | 0.03 Max | 0.045 Max | Balance |
What are the characteristics of 317L Stainless?
• Improved general and localized corrosion to 316L stainless
• Good formability
• Good weldability
In what applications is 317L Stainless used?
• Flue-gas desulfurization systems
• Chemical process vessels
• Petrochemical
• Pulp and Paper
• Condensers in power generation
Mechanical Properties
Minimum Specified Properties, ASTM A240
Ultimate Tensile Strength, ksi Minimum | .2% Yield Strength, ksi Minimum | Elongation Percent | Hardness Max. |
| 75 | 30 | 35 | 217 Brinell |
We can provide 317L material in the form of flange, fittings, pipes, fasteners.
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317L UNS S31703 1.4438 WN SO SW blind plate lap joint flange forging disc ring bleed ring Images
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