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What is 317L Stainless Steel?

Views: 9     Author: Wang     Publish Time: 2025-01-29      Origin: Site

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Stainless Steel 317L (UNS S31703) General properties

Alloy 317L (UNS S31703) is a molybdenum-bearing austenitic stainless steel with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steels such as Alloy 304. In addition, Alloy 317L offers higher creep, stress-to-rupture, and tensile strength at elevated temperatures than conventional stainless steels. It is a low carbon or “L” grade which provides resistance to sensitization during welding and other thermal processes.


317L has excellent corrosion resistance in a wide range of chemicals, especially in acidic chloride environments such as those encountered in pulp and paper mills. Increased levels of chromium, nickel and molybdenum compared to 316L stainless steel improve resistance to chloride pitting and general corrosion. Resistance increases with molybdenum alloy content. Stainless Steel 317L is resistant to sulfuric acid concentrations up to 5 percent at temperatures as high as 120°F (49°C). At temperatures under 100°F (38°C) this alloy has excellent resistance to solutions of higher concentration. However, service tests are recommended to account for the affects of specific operating conditions that may affect corrosion behavior. In processes where condensation of sulfur-bearing gases occurs, 317L is much more resistant to attack at the point of condensation than conventional alloy 316. The acid concentration has a marked influence on the rate of attack in such environments and should be carefully determined by service tests.


AISI 317L Chemical Composition

Different grades of stainless steel are characterized by their chemical composition. Elements and their % composition can greatly influence their properties. Before discovering various properties of SS 317L, let us look at the chemical composition of Stainless Steel 317L:

Iron, Fe

Balance

Chromium, Cr

18-20%

Manganese, Mn

3-4%

Nickel, Ni

11-15%

Silicon, Si

1%

Phosphorous, P

0.045%

Carbon, C

0.03%

Sulfur, S

0.03%

Molybdenum, Mo

3-4%


Mechanical Properties of Stainless Steel 317L

Apart from the physical properties of stainless steel 317L, knowledge of its mechanical properties is equally important to decide its suitability for your application.

Tensile strength

595 MPa

Yield strength

260 MPa

Modulus of elasticity

200 GPa

Poisson's ratio

0.27-0.30

Elongation at break (in 50 mm)

55%

Hardness, Rockwell

B85


Applications of 317L Stainless Steel

317L grade SS is a well founded material for industries that need durability and high corrosion resistance. Its unique properties such as enhanced resistance to harsh environments and ease of fabrication makes it the most preferred choice for different important applications. Here are some of the applications of the alloy you might need to know.


Chemical Processing Equipment

317L SS is most used in reactors, heat exchangers, and storage tanks. The alloy is resistant to corrosive chemicals which enforce its use in chemical processing equipment to reduce the risk of corrosion and increased lifespan.


Oil and Gas Industry

The alloy 317L is ideal for pipelines and offshore platforms. You can use it in tough conditions because it can hold against the exposure to high pressure systems and acidic substances.


Food and Pharmaceutical Industries

The grade of stainless steel 317L is used in production equipment requiring strict hygiene standards. The alloy resists the cleaning agents and keeps sensitive products safe from contamination. This way the safety and compliance of the alloy is ensured.


Marine Environments

Marine industries need 317L grade stainless steel to make shipbuilding, docks, and coastal structures. Its resistance to seawater corrosion increases the integrity of structure and durability in tough marine conditions.

JN Alloy is a distributor and product manufacturer of stainless steel, duplex steel, and nickel.
Tel: +86 19339900211
Add: Stainless steel Market 289, Xinwu District , Wuxi, China
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