Nitronic 50 Stainless Steel Round Bar
Grade: Nitronic 50/XM-19/UNS S20910
Size:
Cold drawn: φ4mm-φ60mm
Hot Rolled: φ16mm-φ230mm
Forged: φ230mm-φ1200mm
Surface Finish: Black Annealed, Polished Bright, Centerless Grinding
Diameter Tolerance: H9, H11, h9, h11 etc
- Fast Shipping / Ready Stock
- ISO 9001 Direct Factory
- Custom Cutting & Processing
- 100% MTC & SGS Inspection Supported
Nitronic 50 stainless steel, also known as XM-19 stainless steel, is a high-performance nitrogen-strengthened austenitic stainless steel grade designated as UNS S20910. It was developed to provide a unique combination of high mechanical strength, excellent corrosion resistance, superior wear resistance, and good toughness. Unlike conventional austenitic stainless steels, Nitronic 50 achieves high strength through nitrogen alloying while maintaining a fully austenitic microstructure.
The alloy contains approximately 21% chromium, 12% nickel, 5% manganese, and 2–4% molybdenum, with nitrogen additions. Chromium provides excellent resistance to general corrosion and oxidation, while molybdenum improves resistance to pitting and crevice corrosion. Nitrogen significantly increases yield strength, improves work hardening characteristics, and enhances resistance to chloride stress corrosion cracking.
Nitronic 50 stainless steel bars provide approximately twice the yield strength of 316L stainless steel while maintaining excellent ductility and toughness. The alloy offers outstanding cavitation erosion resistance, galling resistance, and wear performance, making it suitable for applications involving sliding contact, high loads, and corrosive environments.
Compared with 304 and 316 stainless steels, Nitronic 50 provides improved corrosion resistance, higher strength, and better resistance to galling. Compared with duplex stainless steels, it maintains a fully austenitic structure, providing excellent low-temperature toughness and non-magnetic characteristics in many conditions.
Nitronic 50 stainless steel bars are normally supplied in solution annealed condition. Cold working can significantly increase strength due to nitrogen-enhanced work hardening. The material has good weldability and maintains corrosion resistance after proper welding procedures.
Due to its combination of strength, corrosion resistance, wear resistance, and toughness, Nitronic 50 stainless steel bars are widely used in marine equipment, valve components, pump shafts, fasteners, aerospace parts, chemical processing equipment, food processing machinery, and high-performance mechanical applications.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S20910 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S20910 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM F899 – UNS S20910 | Stainless Steel Surgical Instruments (where applicable) |
| UNS | S20910 | Nitronic 50 / XM-19 Stainless Steel |
| AMS | AMS 5848 | Nitronic 50 Stainless Steel Bar, Wire, Forgings |
| JIS | SUSXM19 (Comparable) | Nitrogen Strengthened Austenitic Stainless Steel |
| EN | No direct equivalent | High Strength Austenitic Stainless Steel |
| DIN | 1.3964 | X2CrMnNiMoN21-16-5-3 Stainless Steel |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Annealing |
| Solution Treatment Temperature | Approximately 1065–1120°C followed by rapid cooling |
| Microstructure | Fully Austenitic |
| Magnetic Properties | Generally Non-Magnetic (Annealed Condition) |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A276 / ASTM A479 |
| Inspection | Chemical Analysis, Tensile Testing, Hardness Testing, Corrosion Testing |
| Supply Condition | Solution Annealed / Cold Worked |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | 4.00 – 6.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 20.50 – 22.00 |
| Nickel (Ni) | 11.75 – 13.00 |
| Molybdenum (Mo) | 2.00 – 2.50 |
| Nitrogen (N) | 0.20 – 0.40 |
| Copper (Cu) | ≤ 0.75 |
| Niobium (Nb) | ≤ 0.10 |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 690 MPa |
| Yield Strength (0.2% Offset) | ≥ 380 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 241 HB |
| Reduction of Area | ≥ 55% |
| Condition | Solution Annealed |
Typical Cold Worked Properties
| Property | Cold Worked Condition |
| Tensile Strength | 900–1200 MPa |
| Yield Strength | 700–1000 MPa |
| Elongation | Reduced Depending on Cold Work |
| Work Hardening | Excellent |
| Industry | Applications |
| Marine Industry | Marine shafts, seawater pumps, fasteners, propeller components |
| Oil & Gas Industry | Valves, pump shafts, downhole components |
| Chemical Industry | Processing equipment, agitators, piping components |
| Aerospace Industry | High-strength structural components |
| Food Processing | Wear-resistant equipment components |
| Pharmaceutical Industry | High-strength corrosion-resistant parts |
| Mechanical Engineering | Bearings, bushings, fasteners, wear components |
| Power Industry | Pump parts, valve components |
Nitronic 50 stainless steel, also known as XM-19 stainless steel, is a high-performance nitrogen-strengthened austenitic stainless steel grade designated as UNS S20910. It was developed to provide a unique combination of high mechanical strength, excellent corrosion resistance, superior wear resistance, and good toughness. Unlike conventional austenitic stainless steels, Nitronic 50 achieves high strength through nitrogen alloying while maintaining a fully austenitic microstructure.
The alloy contains approximately 21% chromium, 12% nickel, 5% manganese, and 2–4% molybdenum, with nitrogen additions. Chromium provides excellent resistance to general corrosion and oxidation, while molybdenum improves resistance to pitting and crevice corrosion. Nitrogen significantly increases yield strength, improves work hardening characteristics, and enhances resistance to chloride stress corrosion cracking.
Nitronic 50 stainless steel bars provide approximately twice the yield strength of 316L stainless steel while maintaining excellent ductility and toughness. The alloy offers outstanding cavitation erosion resistance, galling resistance, and wear performance, making it suitable for applications involving sliding contact, high loads, and corrosive environments.
Compared with 304 and 316 stainless steels, Nitronic 50 provides improved corrosion resistance, higher strength, and better resistance to galling. Compared with duplex stainless steels, it maintains a fully austenitic structure, providing excellent low-temperature toughness and non-magnetic characteristics in many conditions.
Nitronic 50 stainless steel bars are normally supplied in solution annealed condition. Cold working can significantly increase strength due to nitrogen-enhanced work hardening. The material has good weldability and maintains corrosion resistance after proper welding procedures.
Due to its combination of strength, corrosion resistance, wear resistance, and toughness, Nitronic 50 stainless steel bars are widely used in marine equipment, valve components, pump shafts, fasteners, aerospace parts, chemical processing equipment, food processing machinery, and high-performance mechanical applications.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S20910 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S20910 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM F899 – UNS S20910 | Stainless Steel Surgical Instruments (where applicable) |
| UNS | S20910 | Nitronic 50 / XM-19 Stainless Steel |
| AMS | AMS 5848 | Nitronic 50 Stainless Steel Bar, Wire, Forgings |
| JIS | SUSXM19 (Comparable) | Nitrogen Strengthened Austenitic Stainless Steel |
| EN | No direct equivalent | High Strength Austenitic Stainless Steel |
| DIN | 1.3964 | X2CrMnNiMoN21-16-5-3 Stainless Steel |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Annealing |
| Solution Treatment Temperature | Approximately 1065–1120°C followed by rapid cooling |
| Microstructure | Fully Austenitic |
| Magnetic Properties | Generally Non-Magnetic (Annealed Condition) |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A276 / ASTM A479 |
| Inspection | Chemical Analysis, Tensile Testing, Hardness Testing, Corrosion Testing |
| Supply Condition | Solution Annealed / Cold Worked |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | 4.00 – 6.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 20.50 – 22.00 |
| Nickel (Ni) | 11.75 – 13.00 |
| Molybdenum (Mo) | 2.00 – 2.50 |
| Nitrogen (N) | 0.20 – 0.40 |
| Copper (Cu) | ≤ 0.75 |
| Niobium (Nb) | ≤ 0.10 |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 690 MPa |
| Yield Strength (0.2% Offset) | ≥ 380 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 241 HB |
| Reduction of Area | ≥ 55% |
| Condition | Solution Annealed |
Typical Cold Worked Properties
| Property | Cold Worked Condition |
| Tensile Strength | 900–1200 MPa |
| Yield Strength | 700–1000 MPa |
| Elongation | Reduced Depending on Cold Work |
| Work Hardening | Excellent |
| Industry | Applications |
| Marine Industry | Marine shafts, seawater pumps, fasteners, propeller components |
| Oil & Gas Industry | Valves, pump shafts, downhole components |
| Chemical Industry | Processing equipment, agitators, piping components |
| Aerospace Industry | High-strength structural components |
| Food Processing | Wear-resistant equipment components |
| Pharmaceutical Industry | High-strength corrosion-resistant parts |
| Mechanical Engineering | Bearings, bushings, fasteners, wear components |
| Power Industry | Pump parts, valve components |
