Nitronic® 40

Nitronic® 40 - HPA N40 - UNS S21904 (XM11) - UNS S21900 (XM10) - 21-6-9 - N40 Steel - N & Mn Strengthened Stainless Steel

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Table of Contents
Datasheet Chemistry
Inventory Applications
Mechanical Properties Specifications

N40 is a nitrogen-strengthened, high-manganese stainless steel with high strength and excellent resistance to corrosion at high temperatures. N40, also called Nitronic 40®, can be fabricated and is readily weldable. N40 has been used for chemical processing, pollution control equipment and various aircraft engine components.


View or download Electralloy's Nitronic 40 datasheet here

Chemistry* for S21904 (XM11)

Min% Max%
Fe Bal.
Ni 5.50 7.50
Cr 19.00 21.50
Mn 8.00 10.00
N 0.20 0.40
Si 1.00
C 0.040
S 0.010
P 0.04
*Composition information provided by Electralloy's datasheet on Nitronic® 40, available here.

Typical Inventory

Round Bar, Forge, Billet


  • Food and chemical processing.
  • Aircraft components.
  • Polution control equipement.

Mechanical Properties

The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs. The table below shows Electralloy's Typical Room Temperature Mechanical Properties of Nitronic® 40 Stainless Steel. For most common forms and exceptions, check out the datasheet linked underneath the table.

Form & Condition UTS ksi (MPa) 0.2% YS ksi (MPa) Elong. in 2 in., %
Anneal Bar 90 (621) 50 (345) 45

UTS = Ultimate Tensile Strength, YS = Yield Strength

Link to Electralloy's datasheet/brochure on Nitronic® 40

Common Specifications

Note that the specifications listed are common for this alloy but are for reference only and may be specific to a certain form. The specifications listed are not comprehensive nor indicative of any edition, revision, or similar such as an amendment. Please, reach out to our sales department to request the Material Test Report (MTR) or to confirm your required specifications.

Form Standard Specification
Identification UNS S21900/XM-10, UNS S21904/XM-11 (lower Carbon), 21-6-9
Round Bars AMS 5656, ASTM A276, ASME SA276
Sheet, Plate, or Strip AMS 5595
Bars, Forgings, & Rings AMS 5656, ASTM A276
Boiler and Pressure Vessels ASTM A479, ASME SA479
Weld Wire N40W/ UNS S21904/ AWS A5.9 Class ER219/ AMS 5818


Link to Electralloy's datasheet/brochure on Nitronic® 40

Nitronic® is a registered trademark of Cleveland-Cliffs Steel Corp, successor to AK Steel.

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