Nitronic 40 Stainless Steel Bar (XM-10)
Arch Metals supplies Nitronic 40 stainless steel bar from Dallas, Texas, for aerospace and industrial customers across Texas and the surrounding states. Nitronic 40, also known as 21-6-9 or ASTM A276/A479 Type XM-10, is a nitrogen-strengthened austenitic stainless steel with about twice the yield strength of 304, good oxidation resistance at high temperatures and toughness at cryogenic temperatures. We supply certified bar cut to length. Request a quote and we’ll confirm sizes and availability.
Nitronic 40 Stainless Steel Forms
- Round bar, annealed
- Bar and tubing stock on request
Size availability changes with mill supply. Send us your sizes through our quote request form and we’ll confirm stock, lead time and pricing.
Nitronic 40 Conditions and Specifications
- Annealed bar (ASTM A276, ASTM A479 Type XM-10): solution annealed. Strength comes from nitrogen and manganese additions rather than heat treatment.
- Aerospace specification (AMS 5656): covers 21-6-9 bar for aircraft use. Confirm the spec on your drawing when you request a quote.
- Equivalent designations (UNS S21900): also referred to as 21-6-9 stainless.
Not sure which condition or specification your drawing calls for? Send us the print requirements and we’ll match the material.
Typical Properties of Annealed Nitronic 40
- Ultimate tensile strength: about 100 ksi (690 MPa)
- Yield strength: about 60 ksi (414 MPa)
- Elongation: about 45%
- Density: 0.283 lb/in³ (7.83 g/cm³)
- Chemistry: about 21% chromium, 6% nickel and 9% manganese, with nitrogen
These are typical values for annealed bar. Guaranteed minimums vary by specification, condition and size, so check the governing spec or your mill cert for design values.
Why Engineers Choose Nitronic 40
Nitronic 40 roughly doubles the yield strength of 304 stainless steel while staying non-magnetic, even after severe cold work. It resists oxidation up to about 1800°F and stays tough down to cryogenic temperatures, which makes it useful at both extremes. For marine and higher-strength service, see Nitronic 50. Common uses for Nitronic 40 include:
- Aircraft hydraulic lines and tubing
- High-temperature and cryogenic components
- Non-magnetic parts
- Chemical processing equipment
Nitronic 40 Stainless Steel FAQs
Is Nitronic 40 the same as 21-6-9?
Yes. Nitronic 40 is the trade name for 21-6-9 stainless steel, UNS S21900, ASTM Type XM-10.
Is Nitronic 40 magnetic?
No. It stays essentially non-magnetic even after heavy cold working, unlike 304.
How does Nitronic 40 compare with Nitronic 50?
Nitronic 50 has higher strength and better corrosion resistance, especially in seawater. Nitronic 40 is used more for high-temperature and cryogenic service.
Cut-to-Size Nitronic 40 Stainless Steel With Delivery Across Texas
We ship Nitronic 40 stainless steel throughout Texas, Oklahoma, Louisiana, New Mexico and Arizona, and we saw bar and plate to the size you need. See our processing services for cutting options, or browse all the metals we supply. We also supply Nitronic 50 and Nitronic 60 stainless bar.
To get pricing, send us the grade, condition, form, size, length and quantity through our quote request form, or call (888) 444-6061.
Nitronic is a registered trademark of Cleveland-Cliffs Steel Corp.