AL-6XN Stainless Steel Round Bar
Grade: AL-6XN/UNS N08367
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
AL-6XN stainless steel is a high-performance super-austenitic stainless steel grade designated as UNS N08367. It was specifically developed for applications requiring exceptional resistance to chloride-induced corrosion, pitting, crevice corrosion, and stress corrosion cracking. The alloy belongs to the 6% molybdenum super-austenitic stainless steel family and provides corrosion resistance far beyond conventional stainless steels such as 316L and many duplex stainless steels.
The alloy contains approximately 20–22% chromium, 23.5–25.5% nickel, 6–7% molybdenum, and nitrogen additions. The high nickel content improves resistance to stress corrosion cracking and stabilizes the fully austenitic structure, while molybdenum provides outstanding resistance to chloride pitting and crevice corrosion. Nitrogen increases strength and further enhances corrosion resistance. The combination of chromium, molybdenum, and nitrogen results in a high Pitting Resistance Equivalent Number (PREN), typically above 45.
AL-6XN stainless steel bars provide excellent mechanical strength, superior toughness, and outstanding corrosion resistance in severe environments such as seawater, brine, chemical processing solutions, and acidic chloride-containing media. Compared with 316L stainless steel, AL-6XN offers significantly improved resistance to localized corrosion and higher strength. Compared with 904L stainless steel, it provides higher molybdenum content and better chloride corrosion performance.
The material maintains a fully austenitic microstructure, offering excellent weldability, ductility, and impact toughness. AL-6XN stainless steel bars are normally supplied in solution annealed condition to optimize corrosion resistance and mechanical properties. Proper fabrication procedures are recommended to preserve the alloy’s high corrosion performance.
Due to its outstanding seawater resistance and high mechanical performance, AL-6XN stainless steel bars are widely used in desalination plants, offshore oil and gas equipment, chemical processing systems, heat exchangers, flue gas desulfurization equipment, marine piping systems, pharmaceutical equipment, food processing equipment, and power generation applications.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS N08367 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS N08367 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM A182 – UNS N08367 | Forged Stainless Steel Components |
| ASTM | ASTM B691 – UNS N08367 | Nickel Alloy Bar, Rod and Wire |
| ASTM | ASTM B462 / B564 – UNS N08367 | Forgings and Pressure Components |
| UNS | N08367 | AL-6XN Super Austenitic Stainless Steel |
| JIS | No direct equivalent | 6Mo Super Austenitic Stainless Steel |
| EN | 1.4529 (Comparable) | High Alloy Austenitic 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 1100–1200°C followed by rapid cooling |
| Microstructure | Fully Austenitic |
| Magnetic Properties | Non-Magnetic in Solution 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 Condition |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 20.00 – 22.00 |
| Nickel (Ni) | 23.50 – 25.50 |
| Molybdenum (Mo) | 6.00 – 7.00 |
| Copper (Cu) | ≤ 0.75 |
| Nitrogen (N) | 0.18 – 0.25 |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 655 MPa |
| Yield Strength (0.2% Offset) | ≥ 310 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 100 HRB |
| Condition | Solution Annealed |
| Industry | Applications |
| Marine Industry | Seawater piping, offshore structures, seawater pumps |
| Desalination Industry | Reverse osmosis equipment, high-pressure seawater systems |
| Oil & Gas Industry | Offshore equipment, valves, piping systems |
| Chemical Industry | Reactors, heat exchangers, process equipment |
| Power Generation | Cooling systems, condensers, FGD equipment |
| Food Industry | High-temperature processing equipment |
| Pharmaceutical Industry | High-purity processing systems |
| Pulp & Paper Industry | Bleaching equipment, chemical processing units |
AL-6XN stainless steel is a high-performance super-austenitic stainless steel grade designated as UNS N08367. It was specifically developed for applications requiring exceptional resistance to chloride-induced corrosion, pitting, crevice corrosion, and stress corrosion cracking. The alloy belongs to the 6% molybdenum super-austenitic stainless steel family and provides corrosion resistance far beyond conventional stainless steels such as 316L and many duplex stainless steels.
The alloy contains approximately 20–22% chromium, 23.5–25.5% nickel, 6–7% molybdenum, and nitrogen additions. The high nickel content improves resistance to stress corrosion cracking and stabilizes the fully austenitic structure, while molybdenum provides outstanding resistance to chloride pitting and crevice corrosion. Nitrogen increases strength and further enhances corrosion resistance. The combination of chromium, molybdenum, and nitrogen results in a high Pitting Resistance Equivalent Number (PREN), typically above 45.
AL-6XN stainless steel bars provide excellent mechanical strength, superior toughness, and outstanding corrosion resistance in severe environments such as seawater, brine, chemical processing solutions, and acidic chloride-containing media. Compared with 316L stainless steel, AL-6XN offers significantly improved resistance to localized corrosion and higher strength. Compared with 904L stainless steel, it provides higher molybdenum content and better chloride corrosion performance.
The material maintains a fully austenitic microstructure, offering excellent weldability, ductility, and impact toughness. AL-6XN stainless steel bars are normally supplied in solution annealed condition to optimize corrosion resistance and mechanical properties. Proper fabrication procedures are recommended to preserve the alloy’s high corrosion performance.
Due to its outstanding seawater resistance and high mechanical performance, AL-6XN stainless steel bars are widely used in desalination plants, offshore oil and gas equipment, chemical processing systems, heat exchangers, flue gas desulfurization equipment, marine piping systems, pharmaceutical equipment, food processing equipment, and power generation applications.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS N08367 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS N08367 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM A182 – UNS N08367 | Forged Stainless Steel Components |
| ASTM | ASTM B691 – UNS N08367 | Nickel Alloy Bar, Rod and Wire |
| ASTM | ASTM B462 / B564 – UNS N08367 | Forgings and Pressure Components |
| UNS | N08367 | AL-6XN Super Austenitic Stainless Steel |
| JIS | No direct equivalent | 6Mo Super Austenitic Stainless Steel |
| EN | 1.4529 (Comparable) | High Alloy Austenitic 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 1100–1200°C followed by rapid cooling |
| Microstructure | Fully Austenitic |
| Magnetic Properties | Non-Magnetic in Solution 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 Condition |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 20.00 – 22.00 |
| Nickel (Ni) | 23.50 – 25.50 |
| Molybdenum (Mo) | 6.00 – 7.00 |
| Copper (Cu) | ≤ 0.75 |
| Nitrogen (N) | 0.18 – 0.25 |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 655 MPa |
| Yield Strength (0.2% Offset) | ≥ 310 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 100 HRB |
| Condition | Solution Annealed |
| Industry | Applications |
| Marine Industry | Seawater piping, offshore structures, seawater pumps |
| Desalination Industry | Reverse osmosis equipment, high-pressure seawater systems |
| Oil & Gas Industry | Offshore equipment, valves, piping systems |
| Chemical Industry | Reactors, heat exchangers, process equipment |
| Power Generation | Cooling systems, condensers, FGD equipment |
| Food Industry | High-temperature processing equipment |
| Pharmaceutical Industry | High-purity processing systems |
| Pulp & Paper Industry | Bleaching equipment, chemical processing units |
