Description
Product Detail
AL6XN slip on flange is a forged or plate-machined flange with a slightly oversized bore that slips over the pipe and is fillet welded at the hub and pipe end. Made from UNS N08367 super austenitic stainless steel, it provides very good resistance to chloride pitting, crevice corrosion and stress corrosion cracking. It is widely used in seawater handling, flue gas desulfurization, desalination, pulp and paper, chemical processing and offshore piping systems.
SASA FLANGE supplies AL6XN slip-on flanges in standard and customized dimensions to ASME, EN, DIN, JIS and GB requirements. Each batch can be supported with chemical analysis, mechanical testing, dimensional inspection, PMI testing, EN 10204 3.1 certificate and full heat number traceability to meet project and end-user specifications.
- ✓Product Name: AL6XN Slip On Flange
- ✓Material Grade: UNS N08367 / ASTM A182 F44 / AL-6XN
- ✓Product Type: Corrosion resistant super austenitic stainless steel slip-on flange
- ✓Main Feature: Excellent resistance to chloride pitting, crevice corrosion and seawater service
- ✓Applications: Offshore, desalination, chemical processing, FGD, marine and water treatment piping
Product Parameters
| Product Name | AL6XN Slip On Flange |
| Material Grade | UNS N08367, ASTM A182 F44, AL-6XN, 6Mo super austenitic stainless steel |
| Material Type | Super austenitic stainless steel |
| Product Form | Forged flange, ring cut flange, plate machined flange |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 1500 / PN10 – PN100 |
| Sealing Face | RF, FF, RTJ, TG, MFM |
| Surface Treatment | Pickling, passivation, machined finish, anti-rust protection on machined faces |
| Standard | ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS B2220, GB/T 9119 or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional, Hydrostatic |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, CNC Machining, Custom Drilling, Custom Size Processing |
Chemical Composition
The chemical composition below is for reference for AL6XN / UNS N08367 material used in slip-on flanges. Actual composition may vary slightly by melt, product form and applicable ASTM or customer standard. Final supplied chemistry shall comply with the relevant specification and the values stated in the mill test certificate.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| Content % | 0.03 max | 1.00 max | 2.00 max | 0.040 max | 0.030 max | 20.0-22.0 | 23.5-25.5 | 6.0-7.0 | N 0.18-0.25, Cu 0.75 max |
Mechanical Properties
Mechanical properties of AL6XN slip-on flanges depend on product form, solution annealing condition, flange thickness and applicable ASTM specification. The following values are typical reference data for forged or wrought UNS N08367 material. Project requirements may request additional impact, hardness or corrosion testing for critical services.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| ASTM A182 F44 | 690 MPa min | 300 MPa min | 35% min | 95 HRB max | 8.24 g/cm3 |
| UNS N08367 / AL-6XN | 745 MPa typical | 345 MPa typical | 40% min | 223 HB max | 8.24 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | RF | UNS N08367 / A182 F44 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | UNS N08367 / A182 F44 | Stock / Production |
| DN350 – DN600 | Class 150 – 900 | RF / RTJ | UNS N08367 / A182 F44 | Production |
| DN700 – DN1500 | Class 150 – 600 | RF | UNS N08367 / A182 F44 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| Slip-On RF Flange | Standard raised face slip-on flange with easy pipe alignment and fillet welding | General process piping, water treatment and chemical lines |
| Slip-On FF Flange | Flat face version for mating with flat face valves, pumps or non-metallic equipment flanges | Low pressure utility and lined piping systems |
| Slip-On RTJ Flange | Ring type joint facing for higher pressure and improved sealing reliability | Critical hydrocarbon, offshore and high-integrity process service |
| Custom Bore Slip-On Flange | Special bore, drilling, facing or thickness according to project drawings | Replacement parts, skid packages and OEM assemblies |
Equivalent Standards and International Names
AL6XN is a proprietary name commonly associated with UNS N08367 super austenitic stainless steel, frequently supplied as ASTM A182 F44 for forged flanges. International flange dimensional standards differ by region, while the material equivalent is usually referenced by UNS, EN or local grade designation. Exact equivalence should be confirmed against project specifications and MTC data.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM A182 F44 / UNS N08367 |
| Europe | EN 1092-1 | 1.4529 / X1NiCrMoCuN25-20-7 |
| Germany | DIN 2527 / 2566 | Werkstoff 1.4529 equivalent 6Mo grade |
| Japan | JIS B2220 | UNS N08367 / 6Mo equivalent by agreement |
| China | GB/T 9119 | UNS N08367 / 00Cr20Ni24Mo6CuN equivalent by agreement |
Production Process Flow
SASA FLANGE controls each manufacturing stage of AL6XN slip-on flanges to ensure corrosion performance, dimensional accuracy and full traceability. Material selection, machining and inspection are managed according to relevant standards and project requirements.
- 1. Raw Material Selection
- 2. Forging / Cutting
- 3. Heat Treatment
- 4. Rough Machining
- 5. Finish Machining
- 6. Drilling
- 7. Surface Treatment
- 8. Inspection
- 9. Marking
- 10. Packing
- 11. Delivery
| Process Step | Description | Quality Control Point |
|---|---|---|
| Raw Material | Select certified forging billets or plates | Material certificate and traceability |
| Forging | Hot forging to achieve required shape | Forging temperature and reduction ratio |
| Heat Treatment | Solution annealing and rapid cooling as required | Temperature and holding time control |
| Machining | Sealing face, bolt holes, dimensions | Dimensional accuracy and surface finish |
| Inspection | Final inspection before shipment | Dimension, surface, PMI, hydrostatic |
Product Inspection
1. Chemical Composition Inspection
Chemical composition inspection is carried out to verify that the flange material meets UNS N08367 / ASTM A182 F44 requirements. Positive alloy chemistry is checked through spectrometer analysis against specified limits for chromium, nickel, molybdenum, nitrogen and other elements. This helps ensure the corrosion resistance expected for chloride-rich and aggressive media service.
2. Mechanical Properties Testing
Mechanical testing is performed according to the applicable material specification and project requirements. Typical verification includes tensile strength, yield strength, elongation and hardness to confirm the flange has the required strength and ductility after forging and heat treatment. Test results are linked to the heat number for full quality traceability.
3. Dimensional Inspection
Dimensional inspection covers flange outside diameter, thickness, hub dimensions, bore size, bolt circle, bolt hole diameter and quantity, as well as raised face or RTJ profile accuracy. Face finish and flatness are also checked to ensure proper gasket seating, alignment and interchangeability with mating flanges under international standards.
4. PMI Testing and Hydrostatic Testing
PMI testing is used to confirm the supplied flange is genuine AL6XN / UNS N08367 material before shipment. When required by order or application, hydrostatic pressure testing is arranged on assembled components or special pieces. Documentation can include EN 10204 3.1 certificate, MTC, dimensional report and additional inspection records for project approval.
Product Packaging
- ✓Wooden Case Packaging: Suitable for high-pressure and large-diameter products
- ✓Pallet Packing with Shrink Wrap: Suitable for batch shipments and standard sizes
- ✓Anti-rust Oil Coating + Waterproof Paper: Used for ocean freight protection
- ✓Individual Plastic Bag + Carton: Used for small fittings and threaded products
- ✓Clear Marking: Grade, size, pressure class, heat number and PO number
Applications
AL6XN slip-on flanges are selected for piping systems requiring higher resistance to chlorides and aggressive corrosive media than standard stainless steels. Their super austenitic composition makes them suitable for severe industrial environments where long service life, reliable sealing and material integrity are critical.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Offshore utility lines, produced water, seawater lift and firewater systems | Excellent resistance to seawater corrosion, pitting and crevice attack |
| Chemical Processing | Acidic chloride service, brine systems, reactors and transfer piping | Handles aggressive media better than 316L in many chloride environments |
| Power Generation | FGD units, cooling water and condensate related corrosion-prone piping | High molybdenum and nitrogen content improves corrosion resistance and reliability |
| Water Treatment | Desalination plants, RO skids, brine recirculation and high-chloride treatment lines | Suitable for chloride-rich water and long-term low-maintenance operation |
| Marine and Offshore | Seawater piping, ballast systems, deck piping and offshore process skids | Strong resistance to marine atmosphere and seawater exposure |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Slip-On Flanges for global industrial projects
- ✓Customized size, pressure class and material grade according to drawings
- ✓Full standard support: ASME, EN, DIN, JIS, GB, GOST and customer specifications
- ✓Material traceability with heat number control and EN 10204 3.1 material certificate
- ✓Chemical analysis, mechanical testing, PMI testing, hydrostatic and dimensional inspection
- ✓Stock availability for standard items, lead time 3-7 days; custom production 15-30 days
- ✓Export-grade packaging for sea, air and land transportation
- ✓15+ years experience supplying 50+ countries worldwide
FAQ
Q: What is an AL6XN slip on flange?
A: An AL6XN slip on flange is a pipe flange made from UNS N08367 super austenitic stainless steel. It slides over the pipe before welding and is commonly used where strong corrosion resistance is needed. Compared with standard stainless grades, it offers improved performance in seawater, chloride-bearing chemicals and other aggressive process environments.
Q: What materials are available for AL6XN slip on flanges?
A: The main material is UNS N08367, commonly supplied as ASTM A182 F44 and known commercially as AL-6XN. For similar corrosion-resistant applications, SASA FLANGE can also discuss other high-alloy options such as 904L, duplex, super duplex and nickel alloy grades, depending on operating temperature, chloride level and project specifications.
Q: What pressure class is supported?
A: AL6XN slip-on flanges are commonly supplied in ASME Class 150, 300, 600, 900 and in selected sizes up to Class 1500. EN and DIN pressure ratings such as PN10, PN16, PN25, PN40, PN63 and PN100 are also available. Final availability depends on size, facing type, material sourcing and manufacturing method.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can supply custom bore sizes, flange thickness, drilling patterns, special facing types, non-standard dimensions and drawing-based items. We also support ASME, EN, DIN, JIS and GB standards, as well as replacement flanges for existing equipment. Material grade confirmation, PMI and detailed dimensional inspection can be included on request.
Q: What certificate is provided?
A: SASA FLANGE can provide EN 10204 3.1 material certificate with heat number traceability for AL6XN slip-on flanges. Supporting documents may include mill test certificate, chemical analysis, mechanical test results, PMI report, dimensional inspection report and, where specified, hydrostatic or third-party inspection documentation to satisfy project and end-user requirements.
Contact Us
If you are looking for slip on flange al6xn or related custom flange products, please contact SASA FLANGE with your required size, pressure class, material grade, standard, surface treatment, quantity and inspection requirements. Our team will provide professional technical solutions and competitive quotation within 24 hours.
- 📧 Email: sales@sasaflange.com
- 📱 WhatsApp: +86 13764965049
- ☎️ Tel: +86 21 52236361
- 🌐 Website: www.sasaflange.com
