Nitronic 60 Stainless Steel Round Bar
Grade: Nitronic 60/UNS S21800
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 60 stainless steel, also known as UNS S21800, Alloy 218, or XM-31 stainless steel, is a nitrogen-strengthened austenitic stainless steel specially developed for outstanding anti-galling, wear resistance, and high-strength performance. Unlike conventional austenitic stainless steels such as 304 and 316L, Nitronic 60 utilizes a unique alloy design containing high levels of manganese, silicon, and nitrogen to provide exceptional resistance to galling, friction, and adhesive wear.
The alloy contains approximately 17% chromium, 8% nickel, 8% manganese, 4% silicon, and controlled nitrogen additions. Chromium provides corrosion resistance, while the manganese-silicon-nitrogen combination significantly improves work hardening behavior, wear resistance, and resistance to metal-to-metal seizure. Nitrogen also strengthens the austenitic matrix, providing higher yield strength than conventional 300-series stainless steels.
Nitronic 60 stainless steel bars offer approximately twice the yield strength of 304 and 316L stainless steel in the annealed condition, while maintaining excellent ductility, toughness, and corrosion resistance. The material exhibits excellent resistance to galling, fretting, cavitation erosion, and adhesive wear, making it particularly suitable for components exposed to sliding contact or repeated mechanical movement.
The alloy remains fully austenitic and is generally non-magnetic in the solution annealed condition. It maintains good mechanical properties at elevated temperatures and provides oxidation resistance comparable to some higher-temperature stainless steels. Nitronic 60 can be supplied in solution annealed or cold-worked conditions, with cold working significantly increasing strength without requiring precipitation hardening.
Due to its excellent anti-galling performance, strength, and corrosion resistance, Nitronic 60 stainless steel bars are widely used in marine fasteners, valve components, pump shafts, bushings, wear rails, bearings, chemical processing equipment, aerospace components, food processing machinery, and high-performance mechanical assemblies.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S21800 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S21800 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM A193 / A193M – B8R | High Temperature Stainless Steel Bolting |
| ASTM | ASTM A194 / A194M – 8R | Stainless Steel Nuts for High Temperature Service |
| UNS | S21800 | Nitronic 60 Stainless Steel Grade |
| AMS | AMS 5848 | Nitronic 60 Bar, Wire, Forgings |
| JIS | SUSXM27 (Comparable) | Nitrogen Strengthened Austenitic Stainless Steel |
| EN | 1.3815 (Comparable) | High Manganese Nitrogen 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 1010–1120°C followed by rapid cooling |
| Microstructure | Fully Austenitic |
| Magnetic Properties | Essentially Non-Magnetic in 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, Surface Inspection |
| Supply Condition | Solution Annealed / Cold Worked |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.10 |
| Silicon (Si) | 3.50 – 4.50 |
| Manganese (Mn) | 7.00 – 9.00 |
| Phosphorus (P) | ≤ 0.060 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.00 – 18.00 |
| Nickel (Ni) | 8.00 – 9.00 |
| Nitrogen (N) | 0.08 – 0.18 |
| Molybdenum (Mo) | ≤ 0.75 |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 655 MPa |
| Yield Strength (0.2% Offset) | ≥ 380 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 95 HRB (≈210 HB) |
| Condition | Solution Annealed |
Cold Worked Condition (Typical)
| Property | Cold Worked Condition |
| Tensile Strength | 860–965 MPa |
| Yield Strength | 620–830 MPa |
| Elongation | ≥15% |
| Hardening Mechanism | Cold Work Strengthening |
| Industry | Applications |
| Marine Industry | Marine fasteners, shafts, seawater equipment |
| Oil & Gas Industry | Valves, pumps, subsea components, threaded parts |
| Chemical Industry | Agitators, process equipment, wear components |
| Aerospace Industry | High-strength mechanical components |
| Food Processing | Mixing blades, conveyor components, sanitary equipment |
| Pharmaceutical Industry | Wear-resistant processing parts |
| Mechanical Engineering | Bushings, bearings, pins, wear rails |
| Power Industry | Valve components and pump parts |
Nitronic 60 stainless steel, also known as UNS S21800, Alloy 218, or XM-31 stainless steel, is a nitrogen-strengthened austenitic stainless steel specially developed for outstanding anti-galling, wear resistance, and high-strength performance. Unlike conventional austenitic stainless steels such as 304 and 316L, Nitronic 60 utilizes a unique alloy design containing high levels of manganese, silicon, and nitrogen to provide exceptional resistance to galling, friction, and adhesive wear.
The alloy contains approximately 17% chromium, 8% nickel, 8% manganese, 4% silicon, and controlled nitrogen additions. Chromium provides corrosion resistance, while the manganese-silicon-nitrogen combination significantly improves work hardening behavior, wear resistance, and resistance to metal-to-metal seizure. Nitrogen also strengthens the austenitic matrix, providing higher yield strength than conventional 300-series stainless steels.
Nitronic 60 stainless steel bars offer approximately twice the yield strength of 304 and 316L stainless steel in the annealed condition, while maintaining excellent ductility, toughness, and corrosion resistance. The material exhibits excellent resistance to galling, fretting, cavitation erosion, and adhesive wear, making it particularly suitable for components exposed to sliding contact or repeated mechanical movement.
The alloy remains fully austenitic and is generally non-magnetic in the solution annealed condition. It maintains good mechanical properties at elevated temperatures and provides oxidation resistance comparable to some higher-temperature stainless steels. Nitronic 60 can be supplied in solution annealed or cold-worked conditions, with cold working significantly increasing strength without requiring precipitation hardening.
Due to its excellent anti-galling performance, strength, and corrosion resistance, Nitronic 60 stainless steel bars are widely used in marine fasteners, valve components, pump shafts, bushings, wear rails, bearings, chemical processing equipment, aerospace components, food processing machinery, and high-performance mechanical assemblies.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S21800 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S21800 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM A193 / A193M – B8R | High Temperature Stainless Steel Bolting |
| ASTM | ASTM A194 / A194M – 8R | Stainless Steel Nuts for High Temperature Service |
| UNS | S21800 | Nitronic 60 Stainless Steel Grade |
| AMS | AMS 5848 | Nitronic 60 Bar, Wire, Forgings |
| JIS | SUSXM27 (Comparable) | Nitrogen Strengthened Austenitic Stainless Steel |
| EN | 1.3815 (Comparable) | High Manganese Nitrogen 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 1010–1120°C followed by rapid cooling |
| Microstructure | Fully Austenitic |
| Magnetic Properties | Essentially Non-Magnetic in 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, Surface Inspection |
| Supply Condition | Solution Annealed / Cold Worked |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.10 |
| Silicon (Si) | 3.50 – 4.50 |
| Manganese (Mn) | 7.00 – 9.00 |
| Phosphorus (P) | ≤ 0.060 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.00 – 18.00 |
| Nickel (Ni) | 8.00 – 9.00 |
| Nitrogen (N) | 0.08 – 0.18 |
| Molybdenum (Mo) | ≤ 0.75 |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 655 MPa |
| Yield Strength (0.2% Offset) | ≥ 380 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 95 HRB (≈210 HB) |
| Condition | Solution Annealed |
Cold Worked Condition (Typical)
| Property | Cold Worked Condition |
| Tensile Strength | 860–965 MPa |
| Yield Strength | 620–830 MPa |
| Elongation | ≥15% |
| Hardening Mechanism | Cold Work Strengthening |
| Industry | Applications |
| Marine Industry | Marine fasteners, shafts, seawater equipment |
| Oil & Gas Industry | Valves, pumps, subsea components, threaded parts |
| Chemical Industry | Agitators, process equipment, wear components |
| Aerospace Industry | High-strength mechanical components |
| Food Processing | Mixing blades, conveyor components, sanitary equipment |
| Pharmaceutical Industry | Wear-resistant processing parts |
| Mechanical Engineering | Bushings, bearings, pins, wear rails |
| Power Industry | Valve components and pump parts |
