Stainless Steel Grade 317LM (UNS S31725)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Annealing
     Hot Working
     Hardening
Applications

Introduction

Stainless steel grade 317LM is a low-carbon, higher molybdenum austenitic stainless steel. It also has higher nickel content than stainless steel grade 317L. This alloy has been designed to resist corrosion due to sulfuric acid compounds. It possesses good corrosion resistance coupled with good mechanical properties and fabricability.

The following sections will discuss in detail about stainless steel grade 317LM.

Chemical Composition

The chemical composition of stainless steel grade 317LM is outlined in the following table.

Element Content (%)
Chromium, Cr 18-20
Nickel, Ni 12-16
Molybdenum, Mo 4-5
Manganese, Mn 2
Silicon, Si 1
Phosphorus, P 0.045
Carbon, C 0.03
Sulfur, S 0.03
Iron, Fe Balance

Physical Properties

The physical properties of stainless steel grade 317LM are tabulated below.

Properties Metric Imperial
Density 7.7-8.03 g/cm3 0.278- 0.290 lb/in3

Mechanical Properties

The following table shows mechanical properties of stainless steel grade 317LM.

Properties Metric Imperial
Tensile strength 515 MPa 74 ksi
Yield strength 205 MPa 30 ksi
Modulus of elasticity 190-210 GPa 27557-30457 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break 35% 35%
Hardness, (HRB) 95 95

Other Designations

Other designations that are equivalent to stainless steel grade 317LM include the following.

ASTM A167 ASTM A213 ASTM A249 ASTM A312 ASTM A358
ASTM A182 ASTM A240 ASTM A269 ASTM A276 ASTM A376
ASTM A409 ASTM A479      

Fabrication and Heat Treatment

Machinability

Stainless steel grade 317LM should be machined with low speeds and constant feeds to help reduce the tendency of this alloy to work harden. Grade 317LM is tougher than grade 317LM 304 and has long stringy chip. It is recommended that chip breakers should be used.

Forming

For forming stainless steel grade 317LM, twice the force is required. It is recommended that ample radii should be allowed during roll forming. As the material does not snap or break easily, it has to be cut through the entire thickness.

Welding

Welding of stainless steel grade 317LM can be performed using all the conventional methods. It is recommended that grade 317L or Inco 625 filler material should be used when required.

Annealing

Annealing of this material should be performed by soaking at 1121-1149°C (2050-2100°F), followed by water quenching.

Hot Working

Hot working of stainless steel grade 317LM is possible using all the conventional methods. The material should be heated to 1149-1260° C (2100-2300° F). it is advisable to not work this material below (927°C) 1700°F. To achieve optimum corrosion resistance, it is recommended that a post-work annealing process be carried out.

Hardening

Stainless steel grade 317LM can be hardened only through cold reduction.

Applications

Stainless steel grade 317LM is used in the following areas:

  • Paper pulp, textile, and food processing equipment
  • Flue gas scrubbers
  • Process equipment components for products such as dyestuffs, rubber, rayon, ink, chemicals, and bleaches.

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