What is grade 317LMN
Alloy 317LMN a Corrosion Resistant Austenitic Stainless Steel with a High Molybdenum and Nitrogen Content Developed for Use in
Chloride Containing Environments
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 com
bination 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.
Applications:
Air Pollution Control—flue gas desulfurization systems, stack liners, absorbers, ducts, dampers, and fans
Chemical and Petrochemical Processing
Food and Beverage Processing
Pharmaceutical Equipment
Specifications Type 317LMN can be supplied to ASTM and ASME specifications.
Heat Treatment Type 317LMN is solution annealed by heating to 1900°F minimum and followed by water quenching or rapidly cooling by
other means. 317LMN should not be “stress relieved” by heat treatment other than a full solution anneal. 317LMN cannot be hardened
by heat treatment.
Workability Cold Working Type 317LMN is readily formed and fabricated through the full range of cold working operations typically
applied to the common austenitic stainless steels. It can be used in heading, drawing, bending, and upsetting. Because of its nitrogen
content, 317LMN will be slightly stronger and work harden slightly faster than 316L.
Hot Working Type 317LMN can be hot formed in the 1700- 2200°F range. For maximum corrosion resistance, parts that have been hot for
med should be subsequently annealed at 1900°F minimum and water quenched or rapidly cooled by other means.
If you have any enquiry about 317LMN,please feel free to contact us at sales@jawaysteel.com.
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