ThePipingMart Blog Grades Super Alloy Nitronic 30 (UNS S20400) – Composition, Properties, and Uses

Super Alloy Nitronic 30 (UNS S20400) – Composition, Properties, and Uses

Nitronic 30

Manufacturers need the most durable and resilient materials to guarantee their products’ quality and longevity when developing and designing various products. Nitronic 30 is one such material that has gained a reputation as a corrosion-resistant alternative to stainless steel. Due to its exceptional properties, it has become a popular choice for numerous industrial applications. In this blog post, we will delve into the composition, physical and mechanical properties, and uses of Nitronic 30.

What is Nitronic 30?

Nitronic 30 is an austenitic stainless steel alloy with excellent corrosion and oxidation resistance. It also has good high-temperature strength and mechanical properties, making it highly suitable for automotive, marine, nuclear energy and medical applications. The alloy contains a high percentage of chromium-nickel, followed by manganese, phosphorus and sulfur for additional strength, toughness and ductility. Nitronic 30 can be readily welded to any other grade of stainless steel without becoming brittle or cracking during welding.

Nitronic 30 Composition

Nitronic 30 is austenitic stainless steel combining iron, nickel, manganese, chromium, and nitrogen. Nitrogen in the alloy enhances the material’s strength and corrosion resistance. Nitronic 30’s chemical composition is formulated to produce high strength, good toughness, and excellent resistance to wear and galling.

Element Content (%)
Manganese, Mn 15.0-17.0
Chromium, Cr 15.00-17.00
Nickel, Ni 1.50-3.00
Silicon, Si 1
Nitrogen, N 0.15-0.30
Carbon, C 0.03
Sulfur, S, 0.03
Iron, Fe Remainder

Nitronic 30 Mechanical Properties

Nitronic 30 has impressive tensile strength and yield strength. This steel grade has a tensile strength of 860 MPa, approximately twice that of most austenitic stainless steel. Its yield strength is also higher, implying it can endure large loads without deformation. Moreover, Nitronic 30 exhibits superior fatigue strength and toughness.

Properties Metric Imperial
Tensile strength 655 MPa 95 Ksi
Yield strength 330 MPa 48 KSi
Elongation at break 35% 35%
Hardness, Brinell 241 241
Hardness, Rockwell B 100 100

Nitronic 30 Physical Properties

The physical properties of Nitronic 30 make it an ideal candidate for various applications. It is non-magnetic, which makes it suitable for use in industries that require no magnetic interference. Its excellent ductility means it can be drawn or formed into any shape without weakening or breaking. Nitronic 30 also has a low coefficient of thermal expansion, excellent thermal conductivity, and a high melting point, which makes it resistant to high temperatures.

Nitronic 30 Equivalents

  • ASTMA240
  • ASTMA666

Nitronic 30 Corrosion Resistance

One of the most significant advantages of Nitronic 30 is its exceptional corrosion resistance. It resists rust and other types of corrosion, including pitting and crevice corrosion. Nitronic 30 is ideal for industries that require materials that can withstand saltwater, acidic and alkaline solutions, and other harsh chemicals.

Nitronic 30 Uses

Due to its impressive properties, Nitronic 30 has many industrial uses. It is used in chemical processing plants, marine applications, aerospace industries, power generation plants, and medical applications. Its corrosion resistance makes it ideal for enterprises with acidic and alkaline solutions. Its high strength and toughness make it suitable for heavy-duty applications such as gears, fasteners, and valves.

Nitronic 30 Heat Treatment

Nitronic 30 is a work-hardening alloy which can be strengthened by cold working. While heat treatment cannot harden it, Nitronic 30 can be annealed, enhancing its ductility, machinability, and corrosion resistance. Annealing lowers Nitronic 30’s hardness, preventing breakage during the manufacturing process.

Nitronic 30 Machining

When machining Nitronic 30 requires powerful equipment due to the material’s high strength. If the machining equipment cannot handle the material, it can break or cause unwanted deformation.

Nitronic 30 Welding

Nitronic 30 is readily weldable and braze. Hence, it can be welded in various forms without substantial loss of strength.


Overall, Nitronic 30 is a superior material with impressive strength, machinability, and corrosion resistance. Its physical and mechanical properties make it suitable for numerous applications in various industries. It is also environmentally friendly, cost-effective, and requires minimal maintenance. Therefore, it is ideal for manufacturers looking for a durable, long-lasting alternative to regular stainless steel.

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