- Home
- Round Bars
- Nitronic Round Bars
- Nitronic 50 Round Bars
Nitronic 50 Round Bars & Rods - ASTM A276 UNS S20910 Supplier in Mumbai
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier in Mumbai, India. We supply Nitronic 50 round bar suppliers with EN 10204 3.1 mill test certificates and PMI reports.
UNS S20910 (DIN 1.3964 / AISI XM-19) contains Cr 22%, Ni 12.5%, Mn 5%, Mo 2.25%, and 0.20-0.40% nitrogen that strengthens the austenite phase without reducing ductility or corrosion performance. Nitronic 50 round bar offers superior pitting resistance, the benchmark nitrogen-strengthened austenitic stainless steel for marine shafting, high-strength fasteners, and chemical process equipment. Also known as Alloy 50, Fermonic 50, Aquamet 22, and 22-13-5. The PREN exceeds 34, placing it on par with Duplex 2205 for pitting and crevice corrosion resistance.
Three conditions are available: Annealed (1066°C or 1121°C water quench), High Strength (HS) via controlled hot rolling or cold working, and Super High Strength (SHS). In the HS condition, XM-19 yield reaches 585 MPa (85 ksi) and tensile hits 860 MPa (125 ksi). The SHS condition pushes the yield above 690 MPa. The alloy remains non-magnetic (<1.02 permeability) even after severe cold work, and is NACE MR0175 / MR0103 compliant to HRc 35.
Bar diameters range from 6 mm to 300 mm per ASTM A276 / A479 and AMS 5764, in lengths of 1-6 metres. Available forms include round bar, hex bar, flat bar, square bar, forged bar, and rod.
Nitronic 50 Stainless Steel Bar Specifications
| Grade | Nitronic 50 / XM-19 |
|---|---|
| Standard | ASTM A276, A479, ASME SA276, SA479, AMS 5764 |
| Forms | Round Bar, Rod, Hex Bar, Flat Bar, Square Bar, Forged Bar |
| Diameter | 6 mm – 300 mm |
| Length | 1000 – 6000 mm, cut-to-length |
| Condition | Annealed (1066°C or 1121°C), High Strength (HS) |
| Finish | Black, Bright, Polished, Peeled |
Nitronic 50 Annealed vs High Strength (HS) Bar
| Parameter | Annealed | High Strength (HS) | Cold Worked |
|---|---|---|---|
| Yield (min) | 345 MPa | ~330 MPa | 585 MPa |
| Corrosion | Excellent | Maximum | Slightly reduced |
| IGA Resistance | Good | Best | Variable |
| Typical Use | Pump bodies | As-welded, aggressive | Shafting, bolting |
| NACE | Yes | Yes | Yes (HRc 35) |
Chemical Composition of XM-19 Nitronic 50 Bar
| Element | Chromium (Cr) | Nickel (Ni) | Manganese (Mn) | Molybdenum (Mo) | Nitrogen (N) | Niobium (Cb/Nb) | Vanadium (V) | Silicon (Si) | Carbon (C) | Phosphorus (P) | Sulphur (S) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Composition | 20.50 – 23.50 | 11.50 – 13.50 | 4.0 – 6.0 | 1.50 – 3.00 | 0.20 – 0.40 | 0.10 – 0.30 | 0.10 – 0.30 | 1.00 max | 0.060 max | 0.040 max | 0.030 max | Balance |
Mechanical Properties of ASTM A276 Nitronic 50 Round Bar
| Property | Yield Strength 0.2% | Tensile Strength | Elongation | Reduction of Area | Hardness |
|---|---|---|---|---|---|
| Annealed (1066°C) | 345 MPa (50 ksi) min | 655 MPa (95 ksi) min | ≥35% | ≥55% | ≤241 BHN |
| High Strength (HS) | 585 MPa (85 ksi) min | 860 MPa (125 ksi) min | ≥15% | – | Up to HRc 35 |
Physical Properties of Stainless Steel Nitronic 50
| Property | Density | Elastic Modulus | Thermal Expansion (20-100°C) | Thermal Conductivity | Electrical Resistivity | Magnetic Permeability |
|---|---|---|---|---|---|---|
| Value | 7.88 | 196.5 | 16.2 × 10⁻⁶ | 12.8 | 86 | <1.02 |
| Unit | g/cm³ | GPa | /°C | W/m·K | µΩ·cm | – |
Nitronic 50 Round Bar Equivalent Grades
| Property | UNS | AMS | DIN | JIS |
|---|---|---|---|---|
| Standard | S20910 | 5764 | 1.3964 | JISG4311-91, JIS G4318-98, JIS G904L3-2005 |
Get Nitronic 50 Round Bars at Competitive Prices
Available Forms of Nitronic 50 Bar
Nitronic 50 Hot-Rolled Round Bar
Nitronic 50 High Strength (HS) Bar
Nitronic 50 Cold-Drawn Bar
Nitronic 50 Forged Bar
Nitronic 50 Hex Bar
Nitronic 50 Rod
Nitronic 50 Rod
Strength Advantage of Nitronic 50 Bar Over 316/316L
Corrosion Performance of Nitronic 50 Round Bar
Nitronic 50 bar resists pitting, crevice corrosion, and general attack better than 316, 316L, 317, and 317L. PREN >34 matches Duplex 2205. Intergranular corrosion resistance holds even after sensitisation at 675°C for 1 hour. The 1121°C anneal provides maximum IGA resistance. NACE MR0175 / ISO 15156-3 compliant to HRc 35. Limitation: susceptible to SCC in hot chloride environments.
Machining, Forming & Welding of Nitronic 50 Bar
Machining requires slower speeds and higher rigidity due to work-hardening. Coated carbide tools are recommended. Machinability rates above 50% of Type 304. Forging range: 1177-1204°C. Weld with Nitronic 50W (AWS E/ER209) or Inconel 625. For aggressive corrosion service, anneal at 1121°C post-weld.
Industries & Applications Using Nitronic 50 Round Bars
- Marine & Offshore: Used for pump shafts, propeller shafts, and marine hardware. Their non-magnetic nature makes them suitable for mine-hunting and mine countermeasure ships.
- Oil & Gas: Used in downhole tools, subsea valve stems, and special fasteners that must meet NACE MR0175 sour-service requirements.
- Chemical & Petrochemical: Used for pump parts and agitator shafts that operate in organic acids and sulphate (sulfate) solutions.
- Food & Pharma: Pump shafts and mixer shafts; FDA-compliant as food contact surface.
- Medical: Orthopaedic implants per ASTM F1314; MRI-compatible.
- Pulp & Paper: Screens and filtration systems used in chloride-bearing bleaching chemicals.
How to Order Nitronic 50 (XM-19) Round Bar
- Product Form (Round, Rod, Hex, Flat, Square, Forged Bar)
- Diameter / Cross-section (mm or inch)
- Length (standard or cut-to-length)
- Condition (Annealed 1066°C, Annealed 1121°C, or High Strength)
- Finish (Black, Bright, Peeled, Polished)
- NACE Compliance (MR0175 / MR0103 – specify if required)
- Test Certificates (EN 10204 3.1/3.2, PMI, UT, Magnetic Permeability Test)
- Special (Pump shaft quality, medical grade per ASTM F1314)
- Quantity (kg or pieces)
Frequently Asked Questions
Is Nitronic 50 Suitable for Cryogenic Service?
Yes. UNS S20910 maintains impact toughness down to −196°C with elongation above 40%. Retains non-magnetic character. Ideal for LNG equipment and cryogenic fasteners.
What Filler Metal is Used for Welding Nitronic 50 Bar?
Nitronic 50W (AWS E/ER209) is the matching filler. Inconel 625 is an alternative. Caution with autogenous EB/laser welding.
What is the Annealing Temperature for Nitronic 50 Bar?
Two options: 1066°C for higher strength with good corrosion resistance, or 1121°C for maximum corrosion resistance in as-welded service. Both need water quench.