AL-6XN Stainless Steel Pipe UNS N08367 1.4529

Description1.Al-6xn Stainless Steel Pipe UNS N08367: Properties, Applications, and Comparisons‌‌1. Introduction to AL-6XN Stainless Steel Pipe UNS N08367/1.4529‌‌1.1 Material Classification‌AL-6XN Stainless Steel Pipe UNS N08367, EN 1.4529 is a ‌super austenitic stainless steel‌ combining high corrosion resistance, strength, and cost-effectiveness. It bridges the gap between conventional stainless steels (e.g., 316L) and nickel-based alloys, making it ideal for aggressive environments‌.‌1.2 Historical Background‌Developed in the 1980s, AL-6XN addressed corrosion challenges in offshore oil, chemical processing, and marine industries. Its nitrogen-enhanced design optimizes pitting resistance and mechanical performance‌.‌2. AL-6XN Stainless Steel Pipe UNS N08367 Chemical Composition‌‌2.1 Key Alloying Elements‌ElementContent (%)Role‌Cr‌20.0–22.0Enhances oxidation resistance‌‌Ni‌23.5–25.5Stabilizes austenitic structure‌‌Mo‌6.0–7.0Resists chloride-induced corrosion‌‌N‌0.18–0.25Boosts strength and pitting resistance‌‌2.2 Trace Elements‌‌C ≤ 0.03%‌: Reduces carbide precipitation risks‌.‌Cu ≤ 0.75%‌: Improves acid resistance‌.‌3. UNS N08367 Stainless Steel Pipe 1.4529 Al-6xn Physical and Mechanical Properties‌‌3.1 Physical Characteristics‌PropertyValueDensity8.24 g/cm³‌Melting Point1320–1400°C‌Thermal Conductivity25.7 W/m·K (100°C)‌‌3.2 Mechanical Performance‌‌Tensile Strength‌: ≥650 MPa‌.‌Yield Strength‌: ≥295 MPa‌.‌Elongation‌: ≥35%‌.‌PropertyValueDensity8.24 g/cm³‌56Melting Point1320–1400°C‌34Thermal Conductivity25.7 W/m·K (100°C)‌56‌4. Al-6xn Stainless Steel Pipe 1.4529 UNS N08367  Corrosion Resistance‌‌4.1 Chloride Environments‌AL-6XN exhibits ‌PREN ≥ 45‌, outperforming 316L (PREN 26) in seawater and brine. It resists pitting even in 6% FeCl₃ at 60°C‌.‌4.2 Acid and Alkali Resistance‌‌Sulfuric Acid‌: Corrosion rate <0.1 mm/year at 60% concentration (80°C)‌.‌Phosphoric Acid‌: Suitable for concentrated solutions up to 120°C‌.‌5. 1.4529 Stainless Steel Pipe Uns N08367 Al-6xn Manufacturing and Fabrication‌‌5.1 Heat Treatment‌‌Solution Annealing‌: 1065–1150°C with rapid cooling‌.‌Stress Relieving‌: Optional for welded components‌.‌5.2 Welding Methods‌TechniqueFiller MaterialPost-Weld TreatmentTIG/MIGERNiCrMo-3‌48Not required‌26SMAWENiCrMo-3‌35Local annealing‌2AL-6XN (UNS N08367/1.4529) is a super austenitic stainless steel pipe with high Ni/Cr/Mo/N content‌, offering superior resistance to chloride corrosion, pitting, and stress cracking‌, ideal for marine, chemical, and industrial applications‌‌6. Al-6xn Super Austenitic Stainless Steel Pipe UNS N08367 Industrial Applications‌‌6.1 Oil & Gas‌‌Subsea Pipelines‌: Resists H₂S and CO₂ corrosion‌.‌Heat Exchangers‌: Handles sour gas cooling‌.‌6.2 Marine and Desalination‌‌Seawater Reverse Osmosis (SWRO)‌: High-pressure tubing‌.‌Shipbuilding‌: Propeller shafts and ballast systems‌.‌7.Performance of UNS N08367 (AL-6XN/1.4529) Stainless Steel Pipes in Marine and Desalination Systems‌‌7.1 Superior Chloride Resistance‌UNS N08367 (AL-6XN/1.4529) stainless steel pipes exhibit ‌PREN ≥ 45‌, far exceeding conventional 316L (PREN 26) in seawater and brine environments‌12. This alloy resists pitting and crevice corrosion even in 6% FeCl₃ at 60°C, making it ideal for marine applications‌.‌7.2 Mechanical Strength for High-Pressure Systems‌PropertyUNS N08367‌316L‌‌Tensile Strength‌≥650 MPa485 MPa‌Yield Strength‌≥295 MPa170 MPa‌Elongation‌≥35@%The nitrogen-enhanced design of ‌Al-6XN stainless steel pipe‌ ensures structural integrity in high-pressure desalination systems like reverse osmosis (RO) membranes‌.‌7.3 Corrosion Performance in Seawater‌‌Seawater Corrosion Rate‌: <0.01 mm/year‌.‌Stress Corrosion Cracking (SCC) Resistance‌: No cracking observed in 40% MgCl₂ at 120°C‌.‌Stainless steel pipe 1.4529‌ is widely used in seawater intake pipelines, heat exchangers, and brine pumps due to its durability‌.‌7.4 Applications in Desalination Plants‌‌   7.4.1 Reverse Osmosis (RO) Systems‌‌High-Pressure Tubing‌: ‌UNS N08367 stainless steel pipe‌ handles pressures up to 80 bar in RO membranes‌15.‌Brine Discharge Pipes‌: Resists chloride-induced erosion at elevated temperatures‌26.‌   7.4.2 Marine Engineering‌‌Shipbuilding‌: Propeller shafts, ballast systems, and offshore platform components‌15.‌Heat Exchangers‌: Maintains efficiency in seawater cooling loops‌.‌7.5 Cost-Effective Alternative to Nickel Alloys‌ParameterUNS N08367‌15Titanium‌2‌Material Cost‌50% lowerHigh‌Lifespan‌20 years25 years‌Al-6XN stainless steel pipe‌ offers comparable performance to titanium in moderate-temperature seawater systems at half the cost‌.‌7.6 Summary‌UNS N08367 (AL-6XN/1.4529) stainless steel pipes deliver ‌exceptional chloride resistance‌, ‌high mechanical strength‌, and ‌cost efficiency‌ in marine and desalination environments‌. Their nitrogen and molybdenum-rich composition ensures longevity in aggressive seawater and high-pressure RO systems, outperforming traditional alloys like 316L‌.‌FAQ‌‌Q1: Why is UNS N08367 preferred in seawater desalination?‌‌A‌: Its PREN ≥ 45 and high Mo (6–7%) resist chloride-induced corrosion, ensuring reliability in RO systems‌.‌Q2: Can UNS N08367 replace titanium in marine heat exchangers?‌‌A‌: Yes, for temperatures ≤80°C, it offers similar corrosion resistance at lower costs‌.‌Q3: What welding methods suit UNS N08367 pipes?‌‌A‌: TIG welding with ERNiCrMo-3 filler ensures joint integrity without post-weld treatment.‌‌8.UNS N08367 Stainless Steel Pipe Al-6xn 1.4529 Comparative Analysis‌‌8.1 AL-6XN vs. 316L Stainless Steel‌AL-6XN (UNS N08367/1.4529) and 316L (UNS S31603) are both austenitic stainless steels, but their performance diverges significantly in aggressive environments. AL-6XN contains elevated chromium (20-22%), nickel (23.5-25.5%), molybdenum (6-7%), and nitrogen (0.18-0.25%), enabling superior resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich media like seawater or chemical processing systems‌12. In contrast, 316L’s lower alloy content (16-18% Cr, 10-14% Ni, 2-3% Mo) limits its threshold to ~1,000 ppm chlorides, whereas AL-6XN withstands over 10,000 ppm‌.Mechanically, AL-6XN offers 40% higher ASME allowable stress than 316L due to nitrogen strengthening, reducing material thickness requirements in high-pressure applications‌. Both alloys exhibit good weldability, but AL-6XN requires ERNiCrMo-3 filler to retain corrosion resistance in welded joints‌.While 316L remains cost-effective for mild corrosive environments (food processing, architectural), AL-6XN’s lifecycle cost advantages emerge in marine infrastructure, flue gas desulfurization units, or nuclear plant cooling systems where 316L would rapidly degrade‌. For projects demanding extreme durability without nickel-alloy pricing, AL-6XN bridges the gap between standard stainless steels and premium corrosion-resistant alloys‌ParameterAL-6XN‌316L‌‌Cost‌2× higherLower‌Lifespan‌3–5× longer longerLimited to mild conditions‌7.2 AL-6XN vs. Inconel 625‌AL-6XN (UNS N08367/1.4529) and Inconel 625 (UNS N06625) serve distinct roles in corrosive environments. AL-6XN, a super-austenitic stainless steel, achieves corrosion resistance through high chromium (20-22%), nickel (23.5-25.5%), molybdenum (6-7%), and nitrogen (0.18-0.25%) content, excelling in chloride-rich media like seawater and flue gas desulfurization systems‌. Inconel 625, a nickel-chromium-molybdenum alloy, contains ≥58% nickel and 8-10% molybdenum, offering superior performance in high-temperature oxidizing environments and concentrated acidic solutions‌.Mechanically, AL-6XN provides 40% higher ASME allowable stress than 316L stainless steel due to nitrogen strengthening‌, while Inconel 625 maintains exceptional tensile strength (≥758 MPa) and creep resistance above 600°C‌. Both alloys exhibit good weldability, though AL-6XN requires ERNiCrMo-3 filler to preserve corrosion resistance in welded joints‌.Cost-effectiveness differs significantly: AL-6XN bridges the gap between standard stainless steels and nickel alloys, priced 30-50% lower than Inconel 625‌34. For applications under 200°C with chloride exposure (marine piping, desalination), AL-6XN delivers optimal lifecycle value‌12. Inconel 625 remains preferred for extreme conditions (nuclear reactors, aerospace exhausts) where thermal stability (>800°C) and multi-acid resistance outweigh cost concerns‌46. Material selection hinges on balancing temperature demands, chloride concentrations, and budget constraints.ParameterAL-6XN‌Inconel 625‌‌Cost‌40–50% lowerHigh‌Chloride Resistance‌ComparableSuperior‌9. Al6xn Stainless Steel Pipe 1.4529 UNS N08367 Standards and Certifications‌‌9.1 ASTM/ASME Specifications‌‌ASTM B688‌: Seamless pipes for corrosive service‌. reference from astm.org‌ASME SB676‌: Welded tubing‌.‌9.2 ISO and EN Compliance‌‌EN 1.4501‌: European designation‌.‌NACE MR0175‌: Approved for sour gas applications‌.‌10. Conclusion‌AL-6XN/UNS N08367 stainless steel pipe offers ‌superior corrosion resistance‌, ‌high strength‌, and ‌cost efficiency‌ for extreme environments in oil, chemical, and marine industries‌. Its nitrogen-enhanced austenitic structure ensures longevity where traditional alloys fail‌.‌11. Frequently Asked Questions (FAQ)  About 1.4529 Stainless Steel Pipe UNS N08367 AL6XN‌‌Q1: What makes AL-6XN superior to 316L?‌‌A‌: AL-6XN’s higher Mo (6–7%) and N (0.18–0.25%) enhance chloride resistance and strength, extending service life‌.‌Q2: Can AL-6XN replace titanium in seawater systems?‌‌A‌: Yes, for temperatures ≤80°C and moderate pressures, AL-6XN offers comparable performance at 50% lower cost‌.‌Q3: What welding methods are optimal for AL-6XN?‌‌A‌: TIG welding with ERNiCrMo-3 filler ensures corrosion-resistant joints without post-weld heat treatment‌.‌Q4: Is AL-6XN suitable for sulfuric acid storage?‌‌A‌: Yes, it resists corrosion in concentrated H₂SO₄ up to 60% at 80°C 12. Al-6xn Stainless Steel Pipe UNS N08367 1.4529 Available In Stock Or For New Production Size Chart NPS(Inch)DNOD(mm)SCH5SSCH10SSCH40S/STDSCH80S/XSSCH160/XXS1/21521.31.65‌2.11‌2.77‌3.77.473/42026.71.65‌2.11‌2.87‌3.91‌47.82‌12533.41.65‌2.77‌43.38‌4.55‌49.09‌1½4048.31.65‌2.77‌43.68‌5.08‌410.15‌25060.31.65‌2.77‌43.91‌5.54‌411.07‌2½6573.03.05‌5.16‌45.16‌7.01‌14.02‌38088.93.05‌5.49‌45.49‌7.62‌15.24‌4100114.33.05‌6.02‌76.02‌8.56‌17.12‌6150168.33.47.11‌77.11‌10.97‌21.958200219.13.76‌8.18‌8.18‌12.70‌722.210250273.04.19‌9.27‌9.27‌15.09‌725.412300323.94.57‌9.53‌79.53‌17.48‌27.7914350355.66.35‌9.53‌79.53‌15.09‌25.416400406.46.35‌9.53‌79.53‌16.66‌26.1918450457.26.35‌11.13‌711.13‌19.05‌29.36‌20500508.06.35‌12.712.720.62‌32.5424600609.66.35‌12.712.724.61‌36.5313. Al-6xn Stainless Steel Pipe UNS N08367 1.4529 Supplier and Manufacturer Contact: Company: KCM Special Steel Co.,LtdContact : Mr.BobMob & whatsapp: 86-13758498349Email:  [email protected]: www.duplexstainlesssteelpipes.com