ThePipingMart Blog Grades 201LN Stainless Steel (UNS S20153) – Composition, Properties and Uses

201LN Stainless Steel (UNS S20153) – Composition, Properties and Uses

201LN Stainless Steel

If you work in the automotive, construction, or engineering industries, you may have heard of 201LN stainless steel. But what makes it so special? In this blog post, we’ll take a look at the composition, physical properties, and mechanical properties of 201LN stainless steel and how it can be used in different applications.

201LN Composition

Stainless Steel Grade 201LN (UNS S20153) is an austenitic grade of stainless steel containing 17-19% chromium and 7-9% nickel. It also contains trace amounts of manganese, phosphorus, sulfur and nitrogen. It has a low carbon content that makes it highly resistant to corrosion and is commonly used in medical and food processing equipment as well as in architectural structures.

Element Content (%)
Iron, Fe 71
Chromium, Cr 16-17.5
Manganese, Mn 6.40-7.50
Nickel, Ni 4-5
Copper, Cu ≤ 1
Silicon, Si ≤ 0.75
Nitrogen, N 0.10 – 0.25
Phosphorous, P ≤ 0.045
Carbon, C ≤ 0.030
Sulfur, S ≤ 0.015

201LN Physical Properties

Due to its low carbon content and high chromium content, grade 201LN is highly ductile and malleable. It can be easily formed into shapes like rods, bars and sheets. It has a good working capability when heated, so it can be welded easily. The surface finish of this material has a bright polished look, making it aesthetically pleasing for many uses.

201LN Mechanical Properties

The mechanical properties of alloy 201LN are impressive, with a tensile strength ranging from 690 MPa to 860 MPa depending on the form used, such as bars or sheets. Its yield strength ranges from 430 MPa to 550 MPa, while its elongation ranges from 35% up to 60%. This makes it suitable for use in applications that require heavy-duty components, such as bridges or other large structures where strength is paramount.

Properties Metric Imperial
Tensile strength 650 – 880 MPa 94274- 127633 psi
Yield strength 350 – 550 MPa 50763-79770 psi
Elongation 8 – 25% 8 – 25%

201LN Uses

Since this material has excellent corrosion resistance and good physical properties, it is popularly used in many industries, such as aerospace manufacturing, due to its ability to resist wear and tear even after prolonged exposure to temperatures above 800°C (1472°F). Other common uses include medical instruments due to their non-corrosive nature—such as scalpels—and pipes, valves and fittings due to their resistance against corrosion caused by sea water or saltwater environments. Additionally, since this material has low magnetic permeability, it can be used in electrical appliances like motors where magnetic fields are present during operation.


In conclusion, 201LN stainless steel is an austenitic grade of stainless steel widely used for its excellent corrosion resistance combined with its desirable physical properties like ductility and malleability, making it suitable for many different applications such as aerospace manufacturing, medical instruments valves and fittings among others due to its ability to resist wear even when exposed to extreme temperatures over time. Its low magnetic permeability also makes it ideal for use in electrical appliances with strong magnetic fields present during operation. All these combined features make this material an indispensable part of many industries today.

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