XM-19 (NITRONIC-50)

Nitronic 50 stainless steel, also known as UNS S20910 and XM-19, is an austenitic stainless steel with a blend of strength and corrosion resistance that is better than Stainless Steels 316, 316/316L, 317, and 317/317L. In fact, XM-19 has twice the yield strength at room temperature compared to Stainless Steels 316/316L and 317/317L. Additionally, it has good mechanical properties at elevated and sub-zero temperatures. Other characteristics that set XM-19 apart from other grades of stainless steel are that it does not become magnetic when severely cold worked and it has outstanding corrosion resistance in harsh environments such as marine applications.
XM-19 is composed of between 20% and 23% chromium, 11% to 13% nickel, 4% to 6% manganese, and 1.5% to 3% molybdenum, with the balance being iron. Also found in XM-19 are trace amounts of carbon, silicon, sulfur, phosphorus, nitrogen, columbium (or niobium) and vanadium. As noted previously, it is much stronger than Stainless Steels 316/316L and 317/317L; however, the same fabrication equipment and procedures used for the Stainless Steel 300 grades can be utilized for XM-19. In addition, the same cooling techniques used for Stainless Steels 316/316L and 317/317L can be utilized for XM-19.
stainless-steel-nitronic-50-2f60-xm-19-500x500
nitronic-50-xm-19-ss-round-bars-500x500
XM-19 can be a confusing alloy to work with, as there are three different types of conditions used for numerous applications. The three conditions are annealed, as-rolled and high strength. As-rolled is a term used by the mill to state the fact that it is a “rolled” material. All conditions of XM-19 are first rolled. Both the annealed condition and the as-rolled condition are rolled at the same temperature. To acquire XM-19 annealed, the material would first be rolled, followed by either a mill or local annealing process which lowers the tensile and yield properties resulting in a more workable material. On the other hand, transforming XM-19 into the high strength condition can only be done at the mill after the original rolling process, which is done at a lower temperature than annealed and as-rolled material to further help increase the properties. Then high strength material is rolled a second time and later cold worked, which again increases the physical properties of the material even more.
Industries that use XM-19 include:
  • Chemical
  • Fertilizer
  • Food processing
  • Marine
  • Nuclear
  • Petrochemical
  • Petroleum
  • Pulp and Paper
  • Textile
Products partially or completely constructed of XM-19 include:
  • Chains
  • Cables
  • Fasteners
  • Fittings
  • Marine hardware
  • Marine pump shafts
  • Photographic equipment
  • Positive displacement pumps
  • Pressure vessels
  • Saltwater pumps
  • Screens and wire cloths
  • Tanks
  • Underwater robotic arms
  • Valves
ANNEALED
STOCKING DIAMETERS
1/2” TO 12”
MATERIAL LENGTHS
UP TO 24’
AS ROLLED
STOCKING DIAMETERS
2” TO 6”
MATERIAL LENGTHS
UP TO 24’
HIGH STRENGTH
STOCKING DIAMETERS
1/2” TO 8”
MATERIAL LENGTHS
UP TO 24’
BAR SPECIFICATIONS
UNS
TYPE
AMS
ASTM
FEDERAL
CHARACTERISTICS
S20910
XM-19
5764
A-276
A-314
A-479
Nitrogen strengthened austenitic steel, good corrosion resistance with improved mechanical properties. XM-19 is about twice the yield strength of 316.
CHEMISTRY ANALYSIS
C
MN
P
S
SI
CR
NI
MO
CU
OTHER
M/NM
.06
4. – 6.
.04
.03
1.
20.5 – 23.5
11.5 – 13.5
1.5 – 3.
N .2 – .4
Cb .1 – .3
V .1 – .3
NM
Austenitic Stainless
NITRONIC 50 Stainless Steel provides a combination of corrosion resistance and strength not found in any other commercial material available in its price range. This austenitic stainless has corrosion resistance greater than that provided by Types 316 and 316L, plus approximately twice the yield strength at room temperature. In addition, Armco NITRONIC 50 Stainless has very good mechanical properties at both elevated and sub-zero temperatures. And, unlike many austenitic stainless steels, NITRONIC 50 does not become magnetic when cold worked.
High Performance Alloys can make hot rolled, cold worked, & strain hardened High Performance Stainless Steel (HPSS) bars in house. Ask for our GFM Bulletin for more information about our bar processing capabilities. We have expanded to enhance product availability. See more information on NITRONIC 50 HS (High Strength) properties on the NITRONIC 50HS page.