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Austenite 317L Stainless Steel


Austenite 317L (UNS S31726)

General Properties

Alloy 317LMN and 317L are molybdenum-bearing austenitic stainless steels with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steels such as Alloy 304. In addition, 317LMN and 317L alloys offer higher creep, stress-to-rupture, and tensile strengths at elevated temperatures than conventional stainless steels. All are low carbon or "L" grades to provide resistance to sensitization during welding and other thermal processes. The "M" and "N" designations indicate that the compositions contain increased levels of molybdenum and nitrogen respectively. The combination of molybdenum and nitrogen is particularly effective in enhancing resistance to pitting and crevice corrosion, especially in process streams containing acids, chlorides, and sulfur compounds at elevated temperatures. Nitrogen also serves to increase the strength of these alloys. Both alloys are intended for severe service conditions such as flue gas desulfurization (FGD) systems.


Chemical Composition in Weight Percent
per ASTM A240 for Cited Alloys
Element Type 317L Type 317LMN
Carbon 0.03 max 0.03 max
Manganese 2.00 2.00
Silicon 0.75 max 0.75 max
Chromium 18.00 - 20.00 17.00 - 20.00
Nickel 11.00 - 15.00 13.50 - 17.50
Molybdenum 3.00 - 4.00 4.00 - 5.00
Phosphorus 0.04 max 0.04 max
Sulfur 0.03 max 0.03 max
Nitrogen 0.10 max 0.10 - 0.20
Iron Balance Balance
UNS No. S31703 S31726



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