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 is ISO 9001:2015 approved. © FountainHead Alloys 1996
