ATI 317LMN™ alloy, ATI 317LM™ alloy and ATI 317L alloy 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 ATI 304. In addition, ATI 317LMN, ATI 317LM and ATI 317L alloys also offer higher creep, stress-to-rupture, and tensile strengths at elevated temperatures than conventional stainless steels. These alloys represent significant improvements over conventional ATI 317 stainless. 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. All three alloys are intended for severe service conditions such as flue gas desulfurization (FGD) systems. ATI 317LMN, ATI 317LM and ATI 317L stainless steels are available in the form of plate, sheet and strip.