AL-6XN Stainless Steel Pipe UNS N08367 1.4529
1.Al-6xn Stainless Steel Pipe UNS N08367: Properties, Applications, and Comparisons 1. Introduction to AL-6XN Stainless Steel Pipe UNS N08367/1.4529 1.1 Material Classification AL-6XN Stainless Steel Pipe UNS N08367, EN 1.4529 is a super.
- Color
- Silver Grey
- Condition
- Pickled And Annealed
- Length
- 1-16 meters
- Size
- OD: 6-2100MM WT: 1-70MM
- Status
- Heat Treatment
- Used Or New
- New
- Manufacturer
- KCM Special Steel Co., Ltd., Wenzhou, China
- Size range
- OD 2-2400mm x WT 0.8-80mm, seamless and welded
- Quality compliance
- ISO 9001, PED, TUV, DNV, API, AD2000, NORSOK M650, and third party inspection acceptance
Send drawings, cutting lists and inspection requirements straight to us on WhatsApp or by email. We do not use enquiry forms.
1.Al-6xn Stainless Steel Pipe UNS N08367: Properties, Applications, and Comparisons
1. Introduction to AL-6XN Stainless Steel Pipe UNS N08367/1.4529
1.1 Material Classification
AL-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 Background
Developed 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 Composition
2.1 Key Alloying Elements
| Element | Content (%) | Role |
| Cr | 20.0–22.0 | Enhances oxidation resistance |
| Ni | 23.5–25.5 | Stabilizes austenitic structure |
| Mo | 6.0–7.0 | Resists chloride-induced corrosion |
| N | 0.18–0.25 | Boosts strength and pitting resistance |
2.2 Trace Elements
- C ≤ 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 Properties
3.1 Physical Characteristics
| Property | Value |
| Density | 8.24 g/cm³ |
| Melting Point | 1320–1400°C |
| Thermal Conductivity | 25.7 W/m·K (100°C) |
3.2 Mechanical Performance
- Tensile Strength: ≥650 MPa.
- Yield Strength: ≥295 MPa.
- Elongation: ≥35%.
Property Value Density 8.24 g/cm³56 Melting Point 1320–1400°C34 Thermal Conductivity 25.7 W/m·K (100°C)56
4. Al-6xn Stainless Steel Pipe 1.4529 UNS N08367 Corrosion Resistance
4.1 Chloride Environments
AL-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 Resistance
- Sulfuric 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 Fabrication
5.1 Heat Treatment
- Solution Annealing: 1065–1150°C with rapid cooling.
- Stress Relieving: Optional for welded components.
5.2 Welding Methods
| Technique | Filler Material | Post-Weld Treatment |
| TIG/MIG | ERNiCrMo-348 | Not required26 |
| SMAW | ENiCrMo-335 | Local annealing2 |
AL-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 applications
6. Al-6xn Super Austenitic Stainless Steel Pipe UNS N08367 Industrial Applications
6.1 Oil & Gas
- Subsea Pipelines: Resists H₂S and CO₂ corrosion.
- Heat Exchangers: Handles sour gas cooling.
6.2 Marine and Desalination
- Seawater 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 Systems
7.1 Superior Chloride Resistance
UNS 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 Systems
| Property | UNS N08367 | 316L |
| Tensile Strength | ≥650 MPa | 485 MPa |
| Yield Strength | ≥295 MPa | 170 MPa |
| Elongation | ≥35% | 40% |
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 Seawater
- Seawater 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) Systems
- High-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 Engineering
- Shipbuilding: Propeller shafts, ballast systems, and offshore platform components15.
- Heat Exchangers: Maintains efficiency in seawater cooling loops.
7.5 Cost-Effective Alternative to Nickel Alloys
| Parameter | UNS N0836715 | Titanium2 |
| Material Cost | 50% lower | High |
| Lifespan | 20+ years | 25+ years |
Al-6XN stainless steel pipe offers comparable performance to titanium in moderate-temperature seawater systems at half the cost.
7.6 Summary
UNS 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.
FAQ
Q1: 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 Analysis
8.1 AL-6XN vs. 316L Stainless Steel
AL-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 alloys
| Parameter | AL-6XN | 316L |
| Cost | 2× higher | Lower |
| Lifespan | 3–5× longer longer | Limited to mild conditions |
7.2 AL-6XN vs. Inconel 625
AL-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.
| Parameter | AL-6XN | Inconel 625 |
| Cost | 40–50% lower | High |
| Chloride Resistance | Comparable | Superior |
9. Al6xn Stainless Steel Pipe 1.4529 UNS N08367 Standards and Certifications
9.1 ASTM/ASME Specifications
- ASTM B688: Seamless pipes for corrosive service. reference from astm.org
- ASME SB676: Welded tubing.
9.2 ISO and EN Compliance
- EN 1.4501: European designation.
- NACE MR0175: Approved for sour gas applications.
10. Conclusion
AL-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 AL6XN
Q1: 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) | DN | OD(mm) | SCH5S | SCH10S | SCH40S/STD | SCH80S/XS | SCH160/XXS |
|---|---|---|---|---|---|---|---|
| 1/2 | 15 | 21.3 | 1.65 | 2.11 | 2.77 | 3.7 | 7.47 |
| 3/4 | 20 | 26.7 | 1.65 | 2.11 | 2.87 | 3.914 | 7.82 |
| 1 | 25 | 33.4 | 1.65 | 2.774 | 3.38 | 4.554 | 9.09 |
| 1½ | 40 | 48.3 | 1.65 | 2.774 | 3.68 | 5.084 | 10.15 |
| 2 | 50 | 60.3 | 1.65 | 2.774 | 3.91 | 5.544 | 11.07 |
| 2½ | 65 | 73.0 | 3.05 | 5.164 | 5.16 | 7.01 | 14.02 |
| 3 | 80 | 88.9 | 3.05 | 5.494 | 5.49 | 7.62 | 15.24 |
| 4 | 100 | 114.3 | 3.05 | 6.027 | 6.02 | 8.56 | 17.12 |
| 6 | 150 | 168.3 | 3.4 | 7.117 | 7.11 | 10.97 | 21.95 |
| 8 | 200 | 219.1 | 3.76 | 8.18 | 8.18 | 12.707 | 22.2 |
| 10 | 250 | 273.0 | 4.19 | 9.27 | 9.27 | 15.097 | 25.4 |
| 12 | 300 | 323.9 | 4.57 | 9.537 | 9.53 | 17.48 | 27.79 |
| 14 | 350 | 355.6 | 6.35 | 9.537 | 9.53 | 15.09 | 25.4 |
| 16 | 400 | 406.4 | 6.35 | 9.537 | 9.53 | 16.66 | 26.19 |
| 18 | 450 | 457.2 | 6.35 | 11.137 | 11.13 | 19.05 | 29.36 |
| 20 | 500 | 508.0 | 6.35 | 12.7 | 12.7 | 20.62 | 32.54 |
| 24 | 600 | 609.6 | 6.35 | 12.7 | 12.7 | 24.61 | 36.53 |
13. Al-6xn Stainless Steel Pipe UNS N08367 1.4529 Supplier and Manufacturer Contact:
Company: KCM Special Steel Co.,Ltd
Contact : Mr.Bob
Mob & whatsapp:+86-13758498349
Email: [email protected]
FAQ
Questions About This Item
Which standards does this item conform to
Pipe and tube standards we work to include ASTM A312, ASTM A269, ASTM A213, ASTM A790, ASTM A789, ASTM A928, ASTM A249, ASTM A511, DIN 17456, JIS G3463, GOST and others. Fitting standards include ANSI B16.9, ANSI B16.28, ANSI B16.11, ASTM A403, DIN 2605/2606, JIS B2311. Confirm the exact standard for your order with us.
What sizes are available
Welded and seamless pipe from OD 2mm to 2400mm with wall thickness 0.8mm to 80mm, including square and rectangular shapes, with custom fabrication available.
Is this item held in stock
We keep extensive ready stock of standard sizes and grades so urgent project timelines can be met. Send the size and grade and we will confirm availability.
What quality approvals back this product
ISO 9001, PED, TUV, DNV, API, AD2000, NORSOK M650, and third party inspection acceptance.
Can you supply test certificates and third party inspection
Yes. Third party inspection acceptance is part of our standard quality compliance, and our test equipment includes spectrometers, hydrostatic testers and ultrasonic inspection systems.
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