Nitronic 40® is a versatile austenitic stainless steel that combines high yield strength with good corrosion resistance.

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Strip, Coil, Foil & Wire, ASTM A276 (XM-10), ASTM A314 (XM10), ASTM A412 (XM-10), ASTM A473 (XM-10), ASTM A580 (XM-10), AMS 5575, AMS 5656, ASTM A240 (XM-11), ASTM A276 (XM-11), ASTM A314 (XM-11), ASTM A412 (XM-11), ASTM A473 (XM-11), ASTM A479 (XM-11), ASTM A580 (XM11)


Aircraft engine components, chemical process equipment, pollution control equipment, ducting, and bellows. Application where low magnetic permeability is required even after severe cold work.


Nitronic 40® is a versatile austenitic stainless steel that combines high yield strength with good corrosion resistance. Retains high strength and toughness even at sub-zero temperatures.

Chemistry Typical

UNS 21900
Carbon: 0.08 max*
Manganese: 8.00-10.00
Silicon: 1.00 max
Chromium: 19.00-21.50
Nickel: 5.50-7.50
Phosphorus: 0.060 max
Sulfur: 0.030 max
Nitrogen: 0.15-0.40
Iron: Balance

* Where Nitronic 4(19 must meet CuSO4H2SO4 test as defined by Federal Test Methods Standards 151b Method ASTM 393(A708) the use UNS 21904 with .040% max carbon.

Physical Properties

Density: 0.283 lbs/in3 7 .83 g/cm3

Thermal Conductivity: BTU/hr/ft2/° F (W/m•K):
At -290 ° F (-179 °C): 54 (7.8)
At -100 ° F (-73 °C): 76 (10.9)
At 200 ° F (93 °C): 96 (13.8)
At 400 ° F (204 °C): 112 (16.1)
At 600 ° F (316 °C): 126 (18.2)
At 800 ° F (427 °C): 140 (20.2)
At 1000 ° F (538 °C): 156 (22.5)
At 1200 ° F (649 °C): 172 (24.8)
At 1400 ° F (760 °C): 186 (26.8)
At 1600 ° F (871 °C): 200 (28.8)

Magnetic Permeability: H = 200 Oersteds:
Annealed: 1.004
15% Cold Reduction: 1.003
35% Cold Reduction: 1.005
60% Cold Reduction: 1.012


Coil - Sheet, Strip, Foil
Wire - Profile, Round, Flat, Square

Mechanical Properties at Room Temperature

Properties: Annealed Typical

Ultimate Tensile Strength: 112 KSI (772 MPa)
Yield Strength: 68 Ksi (469 MPa)
Elongation: 44%
Hardness: Rb 96

Properties: Tempered

Nitronic 40® can be cold worked to various temper ranges. Contact Ulbrich Technical Service for additional information.

Additional Properties

Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for recommendations.


# 1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
# 2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process.
# 2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA- Bright annealed cold rolled and bright annealed
#CBA- Course bright annealed cold rolled matte finish and bright anneal
#2 - Cold Rolled
# 2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part.
Polished - Various grit finish for specific polish finished requirements

* Not All Finishes are Available for All Alloys - Consult Sales for Applicable Finishes.

Wire Finishes

XC - Extra clean bright annealed or bright annealed and cold rolled Grease - Ultra-bright finish (for decorative applications)
Soap - Soap is not removed from tempered wire to act as a lubricant.

* Contact Ulbrich Wire with special finish requests.

Heat Treatment

Nitronic 40® is non hardenable by heat treatment.


For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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