Nitronic50 S20910 XM-19 Round Bar High Strength Nitronic 50
Material Xm-19 Stainless Steel
Introduction
Nitronic 50® stainless steel is an austenitic stainless steel with
a blend of strength and corrosion resistance that is higher than
stainless steel grades 316, 316/316L, 317, and 317/317L .
The high strength, corrosion resistance, and low magnetic
permeability of this alloy allows it to be used as a material for
medical implants.
The following sections will discuss in detail about stainless steel
grade NITRONIC® 50 (XM-19).
Chemical Composition
The chemical composition of stainless steel grade NITRONIC® 50
(XM-19) is outlined in the following table.
| 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 |
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 |
Mechanical Properties
The following table shows mechanical properties of stainless steel
grade NITRONIC® 50 (XM-19).
| Properties | Metric | Imperial |
|---|
| Tensile strength | 690 MPa | 100 ksi |
| Yield strength | 380 MPa | 55 ksi |
| Elongation | 35% | 35% |
| Hardness | 293 | 293 |
Other designations that are equivalent to stainless steel grade
NITRONIC® 50 (XM-19) include the following:
- AMS 5764
- ASTM A240
- ASTM A276
- ASTM A312
- ASTM A314
- ASTM A403
- ASTM A479
- ASTM F1314
- NACE MR0175/ISO 15156-3
- NACE MR0103
Fabrication and Heat Treatment
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.
Applications
NITRONIC® 50 (XM-19) is widely used in the following sectors:
- Textile
- Marine
- Nuclear
- Medical
- Fertilizer
- Chemical
- Petroleum
- Petrochemical
- Food processing
- Pulp and Paper
Some of the key products made using NITRONIC® 50 (XM-19) include:
- Tanks
- Valves
- Chains
- Cables
- Fittings
- Fasteners
- Pressure vessels
- Saltwater pumps
- Marine hardware
- Marine pump shafts
- Screens and wire cloths
- Photographic equipment
- Underwater robotic arms
- Positive displacement pumps
