XM-19 / Nitronic 50 / UNS S20910 Stainless Steel Bar
May 15, 2026
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What is XM-19 stainless steel Round bar ?
XM-19 stainless steel round bar is a high-performance, nitrogen-strengthened austenitic stainless steel supplied in both annealed and high-strength cold-worked conditions. It offers excellent corrosion resistance superior to that of 316/317 stainless steel, while its yield strength is approximately twice that of these grades. Even in sub-zero environments, it maintains very low magnetic permeability and excellent resistance to sulfide stress cracking, making it suitable for marine engineering and chemical processing applications.
What is equivalent to Nitronic 50 material?
Under ASTM standards, the official grade designation for Nitronic 50 is XM-19 (or XM19), with a UNS number of S20910; additionally, Fermonic 50 and Aquamet 22 are its direct equivalent grades. It is a high-performance, nitrogen-strengthened austenitic stainless steel.
XM-19 Round Bar Specification
| Grade | XM-19 |
| Specification | EN, DIN, JIS, ASTM, BS, ASME, AISI, ISO |
| Standard | ASTM A276/ASME SA276, ASTM A479/ASME SA479 & ASTM A164/ASME SA164 . |
| Stainless steel round Bar | Diameter: 2mm - 600mm |
| Stainless steel bright Bar | Diameter: 2mm - 600mm |
| Stainless steel hex Bar | Dimension: 6mm - 80mm |
| Stainless steel square bar | Dimension: 3.0 - 180mm |
| Stainless steel flat bar | Thickness: 0.5mm - 200mm, Width: 1.5mm - 250 mm |
| Stainless steel angle bar | as requirements |
| Length | Normally 6m, or produce as requirements |
| Surface | Black, Bright. Peeled and Polished, Solution annealed. |
| Delivery condition | cold drawn, hot rolled, forged, grinding, centerless grinding |
| Tolerance | H8, H9, H10, H11, H12, H13,K9, K10, K11, K12 or as per clients' requirements |
XM-19 Round Bar Chemical Composition
Product Standards: ASTM A276, ASTM A479
| Weight % | C | Si | Mn | S | P | Cr | Ni | Mo | Nb | V | N |
| Min. | 4,00 | 20,50 | 11,50 | 1,50 | 0,10 | 0,10 | 0,20 | ||||
| Max. | 0,06 | 1,00 | 6,00 | 0,030 | 0,040 | 23,50 | 13,50 | 3,00 | 0,30 | 0,30 | 0,40 |
Nitronic 50 Round Bar Mechanical Properties
|
Properties |
Metric |
Imperial |
|
Tensile strength at break |
≥ 689 MPa |
≥ 100000 psi |
|
Yield strength |
≥ 379 MPa |
≥ 55000 psi |
|
Elongation at break |
≥ 35% |
≥ 35% |
Heat Treatment of UNS S20910 Stainless Steel Bars
UNS S20910 (Nitronic 50/XM-19) stainless steel bars are austenitic alloys and cannot be hardened through heat treatment; however, they can be strengthened via cold working or annealed to optimize their corrosion resistance and strength. For optimal solution annealing, the material should be heated to 1066°C–1121°C (1950°F–2050°F), followed by rapid water quenching.
Condition Of XM-19 Stainless Steel Bar
| CG-Centreless ground | HF |
| CF-Cold finished | HRAP-Hot rolled annealed and pickled |
| CD-Cold drawn | P-Polished |
| BD-Bright drawn | SRE-Slit rolled edge |
| P&T-Peeled and turned | RT-Rough turned/peeled |
| ST-Smooth turned | PR-Peeled and reeled |
Nitronic 50 Bar Applications
Marine & Shipbuilding: Commonly used for marine hardware, ship shafting systems, pump shafts, and rudder shafts.
Oil & Gas: Used for downhole tools and non-magnetic drill string components.
Chemical Processing & Power Generation: Used for valves, pipe fittings, fasteners, pressure vessels, and heat exchanger components operating in acidic or alkaline environments.
Industrial Equipment: Widely applied in pump shafts, cables, chains, screens, and wire mesh.
XM-19 / Nitronic 50 / UNS S20910 Stainless Steel Bar Supplier
Monthly Production Capacity：For XM-19 stainless steel bars, the monthly production capacity is approximately 300–500 tons.
Inventory Availability：Regular stock of commonly used sizes (diameter 20mm–150mm) is maintained at approximately 50–100 tons, enabling fast shipment.
Customization Capability：Special melting processes such as ESR (Electroslag Remelting) are available to improve material cleanliness and fatigue resistance, making the material suitable for aerospace and deep-sea applications.
Lead Time
Stock Sizes：Shipment and port loading can be completed within 3–7 working days after receipt of advance payment or letter of credit.
Customized Production：Standard hot rolled / cold drawn bars: 25–35 days
Large forgings or special ESR requirements: 40–55 days (including third-party ultrasonic testing and mechanical performance testing)
Packaging
Individual Protection：Both ends of the bars are fitted with plastic protective caps. High-precision polished bars are individually wrapped with PE mesh protective sleeves or bubble bags.
Bundling Method：Each bundle is controlled within a weight range of 1.0–2.0 tons and securely fastened at 4–6 points using high-strength steel straps.
Outer Packaging：Packed in reinforced fumigated wooden cases compliant with ISPM-15 standards (highly recommended for impact protection).
Simple Packaging：Inner layer sealed with thick waterproof woven cloth and reinforced externally with steel straps.
Marking & Documentation：Each bundle is attached with a clear metal tag indicating material grade, heat number, specification, and weight. Complete EN 10204 3.1 Mill Test Certificates (MTC) are provided with shipment, including chemical composition, mechanical properties, intergranular corrosion test results, and ultrasonic testing reports.
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