AL-6XN is a nitrogen-strengthened super-austenitic stainless steel with high nickel (23.5-25.5%), molybdenum (6-7%), and nitrogen (0.18-0.25%) content, specifically engineered to resist chloride stress corrosion cracking, pitting, and crevice corrosion. With a Pitting Resistance Equivalent (PRE) significantly exceeding 316L, it offers exceptional performance in seawater, flue gas desulfurization, and chemical processing applications. Nitrogen strengthening provides higher strength than conventional 300 series austenitics, enabling thinner section designs .
1. Product Specifications & Physical DataZYTC Alloy supplies AL-6XN in comprehensive mill forms for marine, chemical, and industrial applications requiring verified corrosion resistance and mechanical properties. Available Forms: Bar, sheet, plate, pipe, flange, strip, and wire . Specifications: ASTM B688, ASTM B690, ASTM B691, ASTM B804, UNS N08367, EN 1.4529 .
| Chemical Composition (Weight %) | AL-6XN Specification |
|---|
| Nickel (Ni) | 23.5 - 25.5 | | Chromium (Cr) | 20.0 - 22.0 | | Molybdenum (Mo) | 6.0 - 7.0 | | Nitrogen (N) | 0.18 - 0.25 | | Iron (Fe) | Balance | | Manganese (Mn) | 2.0 max. | | Carbon (C) | 0.03 max. | | Copper (Cu) | 0.75 max. | | Silicon (Si) | 1.0 max. | | Phosphorus (P) | 0.040 max. | | Sulfur (S) | 0.030 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.06 g/cm³ | 0.291 lb/in³ | | Melting Range | 1320 - 1390°C | 2410 - 2540°F | | Modulus of Elasticity (RT) | 195 GPa | 28,300 ksi | | Electrical Resistivity | 8.89 × 10⁻⁷ Ω·m | 8.89 × 10⁻⁷ Ω·m |
| Mechanical Properties (Minimum) | Temperature | Metric | Imperial |
|---|
| Tensile Strength | RT (21°C) | 745 MPa | 108 ksi | | Yield Strength (0.2% offset) | RT | 365 MPa | 53 ksi | | Elongation | RT | 45% | 45% | | Tensile Strength | 204°C (400°F) | 623 MPa | 90 ksi | | Yield Strength | 204°C | 279 MPa | 40.5 ksi | | Tensile Strength | 316°C (600°F) | 593 MPa | 86 ksi | | Yield Strength | 316°C | 250 MPa | 36 ksi |
2. Fabrication & Material ComparisonHeat Treatment: Solution anneal at 1120-1170°C (2050-2140°F), rapid water quench; cannot be hardened by heat treatment . Hot Working: Forge at 1095-1175°C (2000-2150°F); reheat as necessary; rapid cooling after working recommended . Cold Working: Work-hardening rate higher than 300 series; intermediate annealing may be required for severe forming . Machining: Requires rigid setups, sharp tools, positive feeds, slow speeds, and ample coolant due to work hardening . Welding: Excellent weldability using TIG, MIG, and SMAW methods; matching filler metals (ERNiCrMo-3 / Alloy 625) recommended to maintain corrosion resistance . Material Comparison: vs. 316L Stainless: Significantly higher pitting resistance; better chloride SCC resistance; higher strength enables thinner sections . vs. 254 SMO (1.4547): Similar 6% Mo super austenitic; AL-6XN offers slightly higher nickel for better SCC resistance; comparable corrosion performance . vs. Super Duplex 2507: Fully austenitic structure provides better toughness at cryogenic temperatures; no risk of sigma phase embrittlement . vs. Alloy 625: More cost-effective alternative for applications requiring high chloride resistance without severe reducing acid exposure .
3. ApplicationsDesalination: Reverse osmosis equipment, high-pressure pumps, seawater intake systems Flue Gas Desulfurization: Scrubbers, absorber towers, ducting, stack liners Chemical Processing: Tanks, vessels, pipelines for chloride-containing media Marine: Seawater heat exchangers, piping systems, offshore platform equipment Pulp & Paper: Bleach plant washers, vats, press rolls, pipelines Offshore Oil & Gas: Production equipment, fire-fighting systems, cooling water systems Tall Oil Distillation: Columns, packing, process equipment
Contact ZYTC Alloy for certified AL-6XN materials with complete traceability, ASTM specifications, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
