Stainless Steel Grade 317LMN (UNS S31726)

Topics Covered

Introduction
Chemical Composition
Mechanical properties
Manufacturing process
Applications

Introduction

Stainless steel 317LMN is a higher molybdenum austenitic stainless steel alloyed with nitrogen to provide high corrosion resistance in acidic chloride-containing environments when compared to 316L and 317L. The alloy is non-magnetic in the annealed condition. It offers higher creep, stress-to-rupture, and tensile strengths at elevated temperatures than other conventional stainless steels.

Chemical Composition

The chemical composition of Grade 317LMN stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe Balance
Chromium, Cr 17 – 20
Nickel, Ni 13.5 - 17.5
Molybdenum, Mo 4-5
Manganese, Mn 2
Silicon, Si 0.75
Nitrogen, N 0.10 - 0.20
Phosphorus, P 0.045
Sulfur, S 0.03
Carbon, C 0.03

Mechanical properties

The mechanical properties of Grade 317LMN stainless steel are displayed in the following table.

Properties Metric Imperial
Ultimate tensile strength 614 MPa 89 ksi
Yield strength 317 MPa 46 ksi
Elongation at break 53% 53%
Reduction in area 69% 69%
Hardness, Rockwell 80 80

Manufacturing process

The properties of 317LMN is similar to other conventional austenitic stainless steels, and can therefore be fabricated in a manner similar to alloys 304 and 306. The alloy is machined using heavy feeds and slow speeds and welded using all common methods. The material is initially forged at temperatures ranging from 1150 to 1205°C (2100-2200°F). It is then annealed at 1080 to1175°C (1975 to 2150°F) followed by air cooling or water quenching. The alloy can be hardened only by cold working.

Applications

The following are some of the major applications of Grade 317LMN stainless steel:

  • Paper pulp industry
  • Textile industry
  • Food processing industry
  • Process equipment industry.

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