Alloy 317LMN (UNS S31726) is an austenitic chromium-nickel-molybdenum stainless steel with corrosion resistance superior to 316L and 317L. The higher molybdenum content, combined with an addition of nitrogen, provides the alloy with its enhanced corrosion resistance, especially in acidic chloride containing service. The combination of molybdenum and nitrogen also improves the alloys resistance to pitting and crevice corrosion.
The nitrogen content of Alloy 317LMN acts as a strengthening agent giving it a higher yield strength than 317L .Alloy 317LMN is also a low carbon grade which enables it to be used in the as-welded condition free from chromium carbide precipitation on the grain boundaries.
Alloy 317LMN is non-magnetic in the annealed condition. It cannot be hardened by heat treatment, only by cold working. The alloy can be easily welded and processed by standard shop fabrication practices.
|A240 317L||0.035 max||2.0 max||1.0 max||0.045 max||0.030 max||18.00 - 20.00||3.00 - 4.00||11.00 - 15.00||57.89 min|
|Melting Range||Density||Tensile Strength (PSI/MPa)||Yield Strength (0.2%Offset) (PSI/MPa)||Elongation %|
|1400 °C (2550 °F)||7.9 g/cm3||Psi – 75000 , MPa – 515||Psi – 30000 , MPa – 205||35 %|