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UNS - S20910

Common name : XM-19

NITRONIC 50 Stainless Steel gives a combination of corrosion resistance and strength not found in any other commercial material available in its price range. This austenitic stainless steel has corrosion resistance greater than that provided by Types 316 and 316L, plus approximately doubles the yield strength at room temperature.

Likewise, NITRONIC 50 Stainless Steel has good mechanical properties at both high and sub-zero temperatures. Furthermore, unlike various austenitic stainless steels, NITRONIC 50 does not become magnetic when cold worked.

  • High strength austenitic alloy
  • Good corrosion resistance

  • Superior corrosion resistance
  • Almost double the yield strength
  • Exceptionally low magnetic permeability
  • Outstanding cryogenic properties
  • Outstanding corrosion resistance gives Armco's NITRONIC 50 Stainless Steel the leading edge for applications where Types 316. 316L, 317 and 317L are only marginal. It's an effective alloy for the petroleum, petrochemical, chemical, fertilizer, nuclear fuel recycling, pulp and paper, textile, food processing and marine industries.
  • Components using the combination of excellent corrosion resistance and high strength currently include pumps, valves and fittings, fasteners, cables, chains, screens and wire cloth, marine hardware, boat and pump shafting, heat exchanger parts, springs and photographic equipment.
  • Fastener - High strength, and higher strength fasteners can improve the durability of you equipment
  • Marine hardware - Mastings, tie downs
  • Marine and Pump shafts - better corrosion than types 304 and 316, with double the yield strength.
  • Valves and fittings - better corrosion than types 304 and 316, with double the yield strength.
  • Down hole rigging - better corrosion than types 304, 316 and 17-4, with double the yield strength in annealed condition.
  • Reduced cross sections - better corrosion than types 304, 316 and 17-4


Slow speeds, positive feeds and abundant resulfurized lubricant is significant to success in machining this alloy. Speeds and positive feeds are comparable to those employed with 316 or 317 stainless steel are appropriate here. Each and every common machining practice can be utilized in this material. Chips will be tough and stringy and it is recommended these curlers or breakers are used.


With this material pre-heating is not required and all frequent welding technique, including gas tungsten arc, gas metal arc and submerged arc are obtained. Filler metal selection should be similar chemistry for maximum strength and resistance to intergranular attack


Heat to 2000 F, soak to equalize, then heat to 2150 and equalize prior to forging.


With this alloy all frequently forming methods can be utilized. Spring back will be more prominent than with standard austenitic and should be contemplated while picking the proper shaping forces. Process annealing is recommended to remove stresses resulting from this alloys' high work hardening rate. Heat to 1950 F (1065 C) for intermediate anneals.


Soak at 1900-2050 F, quench rapidly in air or water.


Hardening this alloy requires cold working. It won’t harden with exposure to thermal treatment.

Chemical Composition %

0.064.0 - 6.00.0400.0300.7520.5 - 23.511.5 - 13.51.5 - 3.0 0.20 - 0.400.10 - 0.300.10 - 0.30

Mechanical Properties

Tensile Strength (ksi)0.2% Yield Strength (ksi)Elongation% in 2 inches

Physical Properties

UnitsTemperature in °C
Density7.88 g/cm³Room
Specific Heat0.11 Kcal/kg.C22°
Melting Range1415 - 1450 °C-
Modulus of Elasticity 199 KN/mm²20°
Electrical Resistivity492 µΩ.cmRoom
Coefficient of Expansion16.2 µm/m °C20 - 100°
Thermal Conductivity15.6 W/m -°K149°

ASTM Specifications

Sheet / PlateBar / ForgingFitting
A 240A 193, A 194, A 276, A 479A 182


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