Nitronic / UNS S20910
Nitronic® 50 (XM-19) is a nitrogen-strengthened austenitic stainless steel with better corrosion resistance than 316/317 and roughly twice the yield strength of 316 in the annealed condition.
- UNS S20910
- Spec ASTM A240
- Density 7.88 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | S20910 |
| Also known as | XM-19, S20910, Alloy 50 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| C | — | 0.06 |
| Mn | 4.0 | 6.0 |
| P | — | 0.045 |
| S | — | 0.030 |
| Si | — | 1.00 |
| Cr | 20.5 | 23.5 |
| Ni | 11.5 | 13.5 |
| Mo | 1.50 | 3.00 |
| Nb | 0.10 | 0.30 |
| V | 0.10 | 0.30 |
| N | 0.20 | 0.40 |
| Fe | Bal. | — |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 690 MPa (100.1 ksi) |
| Yield strength, 0.2% offset (min) | 380 MPa (55.1 ksi) |
| Elongation in 50 mm (min) | 35 % |
| Hardness | 241 HB max |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.88 g/cm³ | 0.285 lb/in³ |
| Magnetic response | Non-magnetic, including after severe cold work | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets & plates | ASTM A240 / ASME SA240 | 0.3 mm – 6 mm |
| Bars & rods | ASTM A276, A479 | 3 mm – 500 mm |
| Flanges & forgings | ASTM A182 (F XM-19 for Nitronic 50) | 1/2" – 48" NB (larger on request) |
Corrosion & temperature resistance
Nitronic 50 resists pitting, crevice corrosion and seawater better than 316/317; Nitronic 60 offers corrosion resistance between 304 and 316 with outstanding galling resistance.
Applications
Nitronic® 50: Marine shafts, pump shafts, valve stems. Marine shafting, pump shafts, valve stems and seats, fasteners, wear plates and chemical process components.
Nitronic® 50 vs Nitronic® 60
| Nitronic® 50 | Nitronic® 60 | |
|---|---|---|
| UNS | S20910 | S21800 |
| Key property | 2× yield of 316, better corrosion | Best galling resistance of stainless |
| Typical use | Marine shafts, pump shafts, valve stems | Valve seats, wear plates, fasteners, pins |
| Cr (wt %) | 20.5–23.5 | 16.0–18.0 |
| Ni (wt %) | 11.5–13.5 | 8.0–9.0 |
| Mo (wt %) | 1.50–3.00 | — |
| C (wt %) | ≤ 0.06 | ≤ 0.10 |
| Tensile / yield (min, MPa) | 690 / 380 | 655 / 345 |
Frequently asked questions
What is the UNS number of Nitronic® 50?
Nitronic® 50 is designated UNS S20910.
What is Nitronic® 50 used for?
2× yield of 316, better corrosion. Typical uses: marine shafts, pump shafts, valve stems.
Is Nitronic® 50 magnetic?
Non-magnetic, including after severe cold work.
In which forms can I buy Nitronic® 50 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Round Bars & Rods, Fasteners. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with Nitronic® 50?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between Nitronic® 50 and Nitronic® 60?
Nitronic® 50: 2× yield of 316, better corrosion. Nitronic® 60: best galling resistance of stainless. See the comparison table on this page.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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