Description
Nitronic 50 Round Bar / XM-19 Round Bar
Nitronic 50 Round Bar is a high-strength, nitrogen-strengthened austenitic stainless steel known for its combination of corrosion resistance, mechanical strength, low magnetic permeability and good performance in demanding industrial environments. It is identified as UNS S20910 and is commonly designated XM-19. For bar products, commonly referenced specifications include ASTM A276, ASTM A479 and AMS 5764, depending on the required product form and application.
Unlike conventional austenitic stainless steels, Nitronic 50 is designed to provide a higher strength level while retaining useful corrosion resistance and ductility. Its composition, which includes chromium, nickel, manganese, molybdenum and controlled nitrogen, contributes to its performance in marine, chemical processing, oil & gas, power generation and general engineering applications.
At Textron Steel and Alloys, Nitronic 50 Round Bars can be sourced for industrial requirements in different diameters, lengths, finishes and material conditions, subject to availability and specification requirements.
What is Nitronic 50 Round Bar?
Nitronic 50 Round Bar is a corrosion-resistant austenitic stainless steel bar manufactured from Nitronic 50 / XM-19 / UNS S20910 material.
The alloy is strengthened through its nitrogen-containing composition, allowing it to provide a useful combination of strength and corrosion resistance. Nitronic 50 is particularly suited to components where ordinary stainless steel grades may not provide the required combination of mechanical properties, corrosion resistance and low magnetic permeability.
Nitronic 50 Round Bar Specifications :
Nitronic 50 bar is commonly supplied to specifications including:
| Specification | Application / Product |
| ASTM A276 | Stainless steel bars and shapes |
| ASTM A479 | Stainless steel bars and shapes for pressure-vessel and related applications |
| AMS 5764 | Specialty/aerospace bar and related products |
| ASME SA276 | ASME specification corresponding to ASTM A276 |
| ASME SA479 | ASME specification corresponding to ASTM A479 |
Nitronic 50 Round Bar Equivalent Designations :
Nitronic 50 is commonly identified using several designations. These should not be confused with product specifications.
| Designation | Details |
| Nitronic 50 | Common commercial/grade name |
| XM-19 | ASTM alloy designation |
| UNS S20910 | Unified Numbering System designation |
| 1.3964 | Commonly associated Werkstoff number |
| 22-13-5 | Composition-based designation |
Nitronic 50 Chemical Composition of XM-19 (UNS S20910) as per ASTM A276 :
| Elements | Min. | Max. |
| C | – | 0.06 |
| Mn | 4.00 | 6.00 |
| P | – | 0.045 |
| S | – | 0.030 |
| Si | – | 1.00 |
| Cr | 20.50 | 23.50 |
| Ni | 11.50 | 13.50 |
| Mo | 1.50 | 3.00 |
| N | 0.20 | 0.40 |
| Cb | 0.10 | 0.30 |
| V | 0.10 | 0.30 |
Applications of Nitronic 50 Grade :
The combination of strength, corrosion resistance and low magnetic permeability makes Nitronic 50 suitable for a broad range of engineering applications.
Marine & Offshore : Nitronic 50 is used in marine components exposed to seawater and chloride-containing environments.
• Marine shafts
• Pump shafts
• Valve components
• Marine fasteners
• Propeller-related components
• Offshore hardware
• Subsea equipment
Chemical Processing : The material is used for components exposed to corrosive process environments.
• Pump components
• Valve parts
• Shafts
• Fasteners
• Agitator components
• Heat-exchanger components
• Process equipment
Oil & Gas : Nitronic 50 can be used in selected oil & gas and offshore applications where corrosion resistance and mechanical strength are required.
• Valve stems
• Pump shafts
• Downhole components
• Offshore hardware
• Subsea components
• High-strength fasteners
Power Generation : Nitronic 50 Round Bar is also considered for selected power-generation components where stainless-steel corrosion resistance and mechanical strength are required.
General Engineering :
• Bushes
• Shafts
• Pins
• Studs
• Bolts
• Valve parts
• Mechanical fittings
• Wear components
