Nitronic 50 Chemical Composition, Mechanical Properties & Corrosion Resistance

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Table of Contents

  1. What Is Nitronic 50?
  2. Nitronic 50 Chemical Composition
  3. Why Nitrogen Is Important in Nitronic 50
  4. Role of Chromium, Nickel and Molybdenum
  5. Nitronic 50 Mechanical Properties
  6. Nitronic 50 Corrosion Resistance
  7. Nitronic 50 Strength and Work Hardening
  8. Nitronic 50 Machining and Fabrication
  9. Nitronic 50 Standards and Designations
  10. How Composition Affects Material Selection
  11. Frequently Asked Questions
  12. Nitronic 50 Round Bar Enquiry

What Is Nitronic 50?

Nitronic 50 is a nitrogen-strengthened austenitic stainless steel commonly identified by UNS S20910.

It is also associated with the designation 22Cr-13Ni-5Mn and XM-19 in applicable specifications and material references.

The alloy is designed to provide a combination of:

  • High strength
  • Corrosion resistance
  • Toughness
  • Ductility
  • Wear resistance
  • Good fabricability

These characteristics make Nitronic 50 relevant to demanding industrial components, including valve shafts, marine components, fasteners, chains, chemical equipment and other engineered parts. Carpenter Technology identifies Nitronic 50 as a nitrogen-strengthened austenitic stainless steel and lists bar and round products among its forms.

Understanding the Nitronic 50 chemical composition is important because the alloy’s performance comes from the controlled combination of chromium, nickel, manganese, molybdenum, nitrogen and other alloying elements.

Nitronic 50 Chemical Composition

The composition can vary slightly depending on the applicable product specification. A representative chemistry published by Carpenter Technology is shown below.

ElementTypical / Specified Range
Chromium20.50–23.50%
Nickel11.50–13.50%
Manganese4.00–6.00%
Molybdenum1.50–3.00%
Nitrogen0.20–0.40%
Niobium / Columbium0.10–0.30%
Vanadium0.10–0.30%
SiliconMax. 1.00%
CarbonMax. 0.060%
PhosphorusMax. 0.040%
SulfurMax. 0.030%
IronBalance

These figures should be treated as representative specification chemistry rather than a substitute for the material test certificate of a particular heat. Carpenter’s published data identifies the alloy as 22Cr-13Ni-5Mn and gives these composition limits.

Why Nitrogen Is Important in Nitronic 50

One of the defining features of Nitronic 50 material is its nitrogen strengthening.

Nitrogen is intentionally used as an alloying element in this stainless steel rather than being treated simply as an unwanted residual.

The nitrogen content contributes to the alloy’s high-strength characteristics while maintaining an austenitic stainless structure.

This is one reason Nitronic 50 can provide a different combination of strength and corrosion resistance from conventional austenitic stainless steels.

Carpenter Technology specifically describes Nitronic 50 as a nitrogen-strengthened austenitic stainless steel.

Role of Chromium, Nickel and Molybdenum

Chromium

Chromium is a major component of Nitronic 50.

The approximately 20.5–23.5% chromium range contributes to the alloy’s corrosion and oxidation resistance.

Nickel

Nickel helps support the austenitic structure and contributes to corrosion resistance and toughness.

Nitronic 50 contains approximately 11.5–13.5% nickel in the Carpenter specification referenced above.

Molybdenum

Molybdenum is present at approximately 1.5–3.0%.

It contributes to corrosion resistance, particularly in environments where localized corrosion resistance is an important consideration.

Manganese

Nitronic 50 contains a relatively high manganese content compared with many conventional stainless grades.

Manganese is part of the alloy design and works together with the other alloying elements to achieve the required metallurgical characteristics.

Nitronic 50 Mechanical Properties

Nitronic 50 mechanical properties depend on product form, processing history, heat treatment and the applicable specification.

Important properties considered by engineers include:

  • Tensile strength
  • Yield strength
  • Elongation
  • Hardness
  • Toughness
  • Ductility
  • Work-hardening behaviour

Carpenter Technology describes Nitronic 50 as offering high strength together with good toughness, ductility and fabricability.

For this reason, it is important not to publish one universal tensile or yield-strength value for every Nitronic 50 round bar.

When a project requires specific mechanical values, the purchaser should specify the applicable standard and condition and verify the supplied MTC (Material Test Certificate).

Nitronic 50 Corrosion Resistance

Nitronic 50 corrosion resistance is one of its major engineering advantages.

The alloy’s chromium, nickel, molybdenum and nitrogen-containing chemistry provides a combination of corrosion resistance suitable for many demanding environments.

Potential service environments include:

  • Marine equipment
  • Chemical equipment
  • Water-handling systems
  • Industrial machinery
  • Valve components
  • Pump components
  • Fasteners
  • Process equipment

Carpenter Technology states that Nitronic 50 provides very good corrosion resistance and reports corrosion resistance superior to Type 316 in its published alloy description.

However, corrosion performance should always be evaluated against the actual environment.

Important factors include:

  • Chloride concentration
  • Temperature
  • Chemical composition
  • Flow conditions
  • Surface finish
  • Mechanical stress
  • Exposure duration

Therefore, “corrosion resistant” does not mean universally corrosion-proof.

Nitronic 50 Strength and Work Hardening

Nitronic 50 is particularly interesting for applications where both corrosion resistance and mechanical strength are required.

The alloy’s nitrogen strengthening contributes to its high-strength characteristics.

Carpenter Technology states that Nitronic 50 has approximately twice the yield strength of 316 in the referenced alloy description, while maintaining very good corrosion resistance.

The actual mechanical properties of a purchased bar, however, should be verified against its applicable specification and material condition.

This distinction is important when selecting Nitronic 50 round bar for engineered components.

Nitronic 50 Machining and Fabrication

Nitronic 50 is not only selected for its material properties; its fabricability is also important.

Published Carpenter data states that the alloy can be:

  • Welded
  • Machined
  • Cold worked

using equipment and methods similar to those used with conventional 300-series stainless steels.

For machining operations, the actual material condition and work-hardening behaviour should be considered when selecting cutting tools, speeds, feeds and machining methods.

For fabrication, the welding procedure should be selected according to the applicable engineering requirements.

Nitronic 50 Standards and Designations

One reason buyers should understand the different material designations is that Nitronic 50 can appear under different names in technical documents.

Common identifiers include:

IdentifierNitronic 50
Commercial NameNitronic 50
UNSS20910
Material Description22Cr-13Ni-5Mn
Related DesignationXM-19
Material TypeNitrogen-strengthened austenitic stainless steel

Carpenter lists several applicable specifications, including ASTM A240, ASTM A276, ASTM A412, ASTM A479, ASTM A580 and ASTM F1314, as well as AMS specifications.

Importantly, the correct standard depends on the product form and application.

For example, ASTM F1314-24 specifically covers wrought nitrogen-strengthened 22Cr-13Ni-5Mn-2.5Mo stainless steel alloy bar and wire for surgical implants under UNS S20910.

Therefore, buyers should not automatically state ASTM F1314 for every industrial Nitronic 50 round bar requirement.

How Composition Affects Material Selection

When engineers select Nitronic 50, the material chemistry should be considered together with the actual service conditions.

For high-strength requirements

The nitrogen-strengthened alloy design can make Nitronic 50 attractive where higher strength is required.

For corrosion resistance

The chromium, nickel and molybdenum combination contributes to corrosion-resistant performance.

For marine equipment

The alloy’s combination of corrosion resistance, strength and toughness can be useful for selected marine components.

For valve and pump components

The material can be considered where strength, corrosion resistance and wear-related performance are required.

For industrial fasteners

Nitronic 50 may be selected for demanding fastener applications where conventional stainless steel does not provide the desired combination of properties.

The final material decision should always be based on the engineering specification and actual operating environment.

Frequently Asked Questions

What is the chemical composition of Nitronic 50?

Nitronic 50 is a nitrogen-strengthened austenitic stainless steel containing approximately 20.5–23.5% chromium, 11.5–13.5% nickel, 4–6% manganese and 1.5–3% molybdenum, with nitrogen at approximately 0.20–0.40% in the referenced Carpenter specification.

What is the UNS number of Nitronic 50?

The UNS designation is S20910.

What is Nitronic 50 also called?

Nitronic 50 is associated with 22Cr-13Ni-5Mn, UNS S20910 and XM-19 terminology in applicable technical references.

Is Nitronic 50 corrosion resistant?

Yes. Corrosion resistance is one of the principal characteristics of Nitronic 50. Its actual performance depends on the specific service environment.

Is Nitronic 50 stronger than 316 stainless steel?

Published Carpenter Technology information describes Nitronic 50 as having approximately twice the yield strength of 316 while providing very good corrosion resistance. Actual values depend on product condition and specification.

Is Nitronic 50 magnetic?

Carpenter Technology states that Nitronic 50 remains nonmagnetic after severe cold work.

What standard applies to Nitronic 50 round bar?

Applicable standards depend on product form and application. Carpenter lists ASTM A276 and ASTM A479 among the applicable specifications for this alloy. ASTM F1314 is a specific standard for wrought UNS S20910 bar and wire for surgical implants.

Technical References

For authoritative technical information, consult:

Nitronic 50 Round Bar Enquiry – Manan Steel & Metals

Looking for Nitronic 50 round bar / UNS S20910 for an industrial requirement?

Manan Steel & Metals supplies specialty alloy and engineering metal products for industrial buyers.

For a quotation, send:

Material: Nitronic 50
UNS: S20910
Diameter: Required size
Length: Required length
Quantity: Kg / Nos. / Tonnes
MTC: Required / As applicable
Delivery Location: Required destination

You can also visit our Nitronic 50 Round Bar product page for more information.

Manan Steel & Metals

Shop No. 2, Hira Building,
97 Khetwadi Main Road (Nanubhai Desai Road),
Girgaon, Mumbai – 400004, Maharashtra, India

Phone: 7977369869
Email: manansteel@gmail.com
Website: www.manansteel.com

Send your Nitronic 50 size and quantity requirement for pricing and availability.