Nitronic – 50

Nitronic – 50 | EN 1.3964 | ISO 15156-3 | NACE MR0175 | UNS S20910 | AMS 5764 | ASTM A 193 | Werkstoff 1.3964

Nitronic 50 (XM19/ AMS 5764)

Nitronic 50 (XM-19), or N-50 is a high strength and good corrosion resistant austenitic stainless steel. It has nearly double the yield strength of 304 and 316 stainless steel and has better corrosion resistance than 317L stainless steel. N50 Stainless remains non-magnetic even after being severely cold worked. It maintains strength at high temperatures as well as sub-zero temperatures.

Chemical Composition 

Element Content (%)
Chromium, Cr 20.5-23.5
Nickel, Ni 11.5-13.5
Manganese, Mn 4-6
Molybdenum, Mo 1.5-3
Silicon, Si 1 max
Nitrogen, N 0.20-0.40
Niobium, Nb 0.10-0.30
Vanadium, Va 0.10-0.30
Phosphorous, P 0.04 max
Carbon, C 0.06 max
Sulfur, S 0.010 max

Inventory

  • Nitronic 50 Round Bar

Common Trade Names

  • N-50 Stainless

Features

  • High strength austenitic alloy
  • Good corrosion resistance

Applications

  • Seawater pump shafts
  • Heat exchangers
  • Pressure vessels
  • Marine hardware

Density: 0.285 lb/inch3
Melting Range: 2579-2642°F
Electrical Resistivity: 492 ohm circ-mil/ft

Temperature, °F 70 200 300 400 600 800 900 1000 1200 1400
Coefficient of Thermal Expansion, in/in°F x 10-6 9.0 9.2 9.6 9.9 10.2 10.5 10.8
Thermal Conductivity
Btu • ft/ft2 • hr • °F
108 108 124 141 160
Modulus of Elasticity,
psi X 106 STA
26.2

* 70°F to indicated temperature.

Mechanical Properties

Minimum Specified Properties, ASTM A 276 Bar

Ultimate Tensile Strength, ksi 100
0.2% Yield Strength, ksi 55
Elongation, % 35
Reduction of Area, % 55

Physical Properties

The physical properties of stainless steel grade NITRONIC 50 (XM-19) are tabulated below.

Properties Metric Imperial
Density 7.88 g/cm3 0.285 lb/in3

Typical Tensile Properties

Temperature, °F -320 -100 75 200 400 600 800 1000 1200 1350 1500
Ultimate Tensile Strength, ksi 117 107 96 92 89 84 74 66 52
0.2% Yield Strength, ksi 60 50 38 35 34 32 31 31 30
Elongation, 2% 45 43.5 43.5 42.5 43.5 41 38 37 41
Impact Strength, ft-lbs 50 115 170

Machinability

Stainless steel grade Nitronic 50 has machinability characteristics that are similar to other austenitic stainless steels; however it requires slower speeds, more power, and higher rigidity due to its high work hardening rate. It is recommended that coated carbide tooling be used.

Forming

Stainless steel grade Nitronic 50 can be formed using the same methods applied for other austenitic stainless steels. More power for forming and forging is needed for this alloy. Forging can be done at 1177-1204°C (2150-2200°F).

Welding

Welding of stainless steel grade Nitronic 50 can be performed using traditional joining processes. Recommended filler metal should be Nitronic 50W (AWS E/ER209).

Caution should be taken while using autogenous, high power density joining processes such as EB or laser welding, due to low FN potential and severe outgassing possibility.

Heat Treatment

Final annealing process performed for several of the applications, is done at 1065°C (1950°F), which is followed by water quenching. In case this material is used in a strongly corrosive environment, annealing should be done at 1121°C (2050°F). This alloy cannot be hardened by heat treatment.

Specifications

AMS 5764
ASTM A 193, ASTM A 262, ASTM A 276, ASTM A 276 Condition A, ASTM A 276 Condition S, ASTM A 479
EN 1.3964
ISO 15156-3
NACE MR0175
UNS S20910
Werkstoff 1.3964

 

© FountainHead Alloys 1996