Nitronic 50 / XM-19 Round Bar (UNS S20910)
Nitronic 50, designated XM-19 in ASTM standards, is a nitrogen strengthened austenitic stainless steel with 22 % chromium, 12.5 % nickel, 2 % molybdenum and additions of niobium and vanadium. It provides corrosion resistance better than 316L and 317L together with nearly twice their yield strength, and it stays non-magnetic and tough from cryogenic temperatures up to 650 °C.
Nexforge Alloys manufactures and stocks Nitronic 50 round bars in the annealed (Condition A) and high strength hot worked (Condition HS) conditions to ASTM A276 / A479, ASME SA479 and AMS 5764. Bars are supplied peeled or ground with full mechanical and chemical certification for pump shaft, marine and sub-sea applications.
Nitronic 50 / XM-19 (UNS S20910) round bars from 6 mm to 250 mm diameter in annealed and high strength (HS) conditions, as per ASTM A276 / A479 / AMS 5764.
Nitronic 50 Round Bar Specification
| Parameter | Details |
|---|---|
| Alloy Designations | Nitronic 50, XM-19, UNS S20910, Alloy 22-13-5 |
| Standards | ASTM A276, ASTM A479, ASME SA479, AMS 5764, ASTM A193 / A320 Grade B8R (fasteners) |
| Size Range | 6 mm to 250 mm diameter |
| Length | Random 3 to 6 metres, or cut to length |
| Condition | Annealed (Condition A) or high strength hot worked (Condition HS) |
| Surface Finish | Peeled, centreless ground, bright, rough turned |
| Tolerance | h9 / h10 / h11 or as per drawing |
| Testing | Chemical, tensile, hardness, impact, UT on request |
| Certification | EN 10204 3.1 mill test certificate |
Chemical Composition (% by weight)
| Element | C | Mn | Si | P | S | Cr | Ni | Mo | N | Nb | V | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nitronic 50 (S20910) | 0.06 max | 4.00 - 6.00 | 1.00 max | 0.040 max | 0.030 max | 20.5 - 23.5 | 11.5 - 13.5 | 1.50 - 3.00 | 0.20 - 0.40 | 0.10 - 0.30 | 0.10 - 0.30 | Balance |
Mechanical Properties
| Condition | Tensile Strength (min) | 0.2% Yield Strength (min) | Elongation (min) | Reduction of Area (min) | Density |
|---|---|---|---|---|---|
| Annealed (Condition A) | 690 MPa (100 ksi) | 380 MPa (55 ksi) | 35 % | 55 % | 7.88 g/cm³ |
| High strength (Condition HS), up to 50 mm dia | 930 MPa (135 ksi) | 725 MPa (105 ksi) | 20 % | 50 % | 7.88 g/cm³ |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- Corrosion resistance superior to 316L and 317L, especially in seawater
- Yield strength nearly twice that of 316L in the annealed condition
- Non-magnetic even after severe cold working
- Excellent toughness at cryogenic temperatures and good strength up to 650 °C
Applications
- Pump shafts, valve stems and fasteners in marine and offshore service
- Boat and propeller shafting
- High strength non-magnetic components for oil field tools
- Chemical, petrochemical and pulp and paper equipment
- Nuclear and cryogenic equipment