Description
Product Detail
Duplex super duplex steel slip on flanges are forged or plate-based flanges that slide over the pipe and are fillet welded at the hub and bore side for secure connection. They combine good mechanical strength with excellent resistance to chloride pitting, crevice corrosion and stress corrosion cracking, making them suitable for seawater systems, offshore platforms, chemical processing, pulp and paper, heat exchangers and desalination plants.
SASA FLANGE supplies duplex and super duplex slip on flanges in standard and custom dimensions with strict quality control. Available services include chemical analysis, mechanical testing, dimensional inspection, sealing face inspection, PMI testing, EN 10204 3.1 certificate and full heat number traceability to support project procurement and end-user documentation requirements.
- ✓Product Name: Duplex Super Duplex Steel Slip On Flanges
- ✓Material Grade: ASTM A182 F51, F53, F55 / UNS S31803, S32205, S32750, S32760
- ✓Product Type: Slip-On Flanges
- ✓Main Feature: High strength with excellent pitting, crevice and chloride stress corrosion resistance
- ✓Applications: Offshore, oil and gas, chemical processing, desalination, marine piping, power and water treatment
Product Parameters
| Product Name | Duplex Super Duplex Steel Slip On Flanges |
| Material Grade | ASTM A182 F51, F53, F55; UNS S31803, S32205, S32750, S32760 |
| Material Type | Duplex Stainless Steel / Super Duplex Stainless Steel |
| Product Form | Forged flange, machined flange, plate-cut and machined flange |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN6 – PN100 |
| Sealing Face | RF, FF, RTJ, TG, MFM |
| Surface Treatment | Pickling, passivation, machined finish, protective oil on machined surfaces if required |
| 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 following chemical composition is for reference for commonly supplied duplex and super duplex grades used in slip on flanges. Final composition shall comply with the applicable ASTM, EN or customer standard and be confirmed by the mill test certificate and approved inspection records for each heat.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| A182 F51 / S31803 % | 0.03 max | 1.00 max | 2.00 max | 0.03 max | 0.02 max | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | N 0.08-0.20 |
| A182 F53 / S32750 % | 0.03 max | 0.80 max | 1.20 max | 0.035 max | 0.02 max | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | N 0.24-0.32, Cu 0.50 max |
| A182 F55 / S32760 % | 0.03 max | 1.00 max | 1.00 max | 0.03 max | 0.01 max | 24.0-26.0 | 6.0-8.0 | 3.0-4.0 | N 0.20-0.30, W 0.50-1.00, Cu 0.50-1.00 |
Mechanical Properties
Mechanical properties shown below are typical minimum values for common duplex and super duplex flange grades. Actual values may vary depending on grade, heat treatment condition, section thickness and applicable forging or product standard. Certified mechanical test results are provided according to the material test certificate for each supplied batch.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| A182 F51 / S31803 | 620 MPa min | 450 MPa min | 25% min | 290HB max | 7.80 g/cm3 |
| A182 F53 / S32750 | 795 MPa min | 550 MPa min | 15% min | 310HB max | 7.80 g/cm3 |
| A182 F55 / S32760 | 750 MPa min | 550 MPa min | 25% min | 300HB max | 7.80 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | RF | F51 / F53 / F55 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | F51 / F53 / F55 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | RF / RTJ | F51 / F53 / F55 | Production |
| DN700 – DN1500 | Class 150 – 900 | RF | F51 / F53 / F55 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| Slip-On RF Flange | Raised face slip on flange for standard gasket seating and easy pipe alignment | General process piping, water treatment, chemical lines |
| Slip-On RTJ Flange | Slip on flange with ring type joint groove for higher pressure sealing performance | Oil and gas, offshore topside, high-pressure hydrocarbon service |
| ASME Slip-On Flange | Manufactured to ASME B16.5 or ASME B16.47 dimensions and pressure classes | North American projects, refineries, LNG and power plants |
| EN/DIN Slip-On Flange | Manufactured to EN 1092-1 or DIN dimensional requirements in PN series | European projects, marine systems, water and process plants |
Equivalent Standards and International Names
Duplex and super duplex slip on flanges can be manufactured to multiple international flange standards while using equivalent corrosion-resistant material grades. Dimensional standards vary by region, while the final material designation may be specified by ASTM, UNS, EN or project documents. SASA FLANGE supports cross-standard production for export projects and replacement requirements.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 / B16.47 | ASTM A182 F51, F53, F55 / UNS S31803, S32750, S32760 |
| Europe | EN 1092-1 | 1.4462, 1.4410, 1.4501 |
| Germany | DIN 2527 / 2566 | X2CrNiMoN22-5-3, X2CrNiMoN25-7-4, X2CrNiMoCuWN25-7-4 |
| Japan | JIS B2220 | SUS329J3L equivalent / super duplex on request |
| China | GB/T 9119 | 022Cr22Ni5Mo3N, 022Cr25Ni7Mo4N, 022Cr25Ni7Mo4WCuN |
Production Process Flow
Manufacturing of duplex and super duplex slip on flanges requires strict control of raw material, heat treatment and machining to maintain corrosion resistance, ferrite-austenite balance and dimensional accuracy according to international flange standards.
- 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 by duplex grade | Temperature, soaking time and cooling 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 chromium, nickel, molybdenum, nitrogen and other alloying elements meet the specified duplex or super duplex grade requirements. Raw material certificates are reviewed and laboratory analysis is performed when required to confirm compliance with ASTM, EN or customer specifications before production release.
2. Mechanical Properties Testing
Mechanical testing verifies tensile strength, yield strength, elongation and hardness in accordance with the applicable material standard. For duplex and super duplex flanges, these tests help confirm the required strength level and proper heat treatment condition. Test results are recorded against each heat number and included in the quality documentation package when specified.
3. Dimensional Inspection
Dimensional inspection checks outside diameter, bore, thickness, hub dimensions, bolt circle, bolt hole quantity and hole diameter according to ASME, EN, DIN, JIS or GB standards. Sealing face finish, raised face height and RTJ groove dimensions are also inspected to ensure fit-up accuracy and reliable gasket sealing during installation.
4. PMI Testing and Hydrostatic Testing
PMI testing is used to confirm material grade and alloy identity for duplex and super duplex flanges before shipment. Hydrostatic testing can be arranged as part of assembled piping or special project requirements. SASA FLANGE provides EN 10204 3.1 certificate, traceable heat numbers and inspection records to support end-user and third-party verification requirements.
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
Duplex and super duplex steel slip on flanges are widely selected for corrosive and chloride-containing services where both high strength and long-term reliability are required. They are especially suitable for offshore, seawater, chemical and high-performance utility systems where conventional stainless steel may not provide sufficient resistance.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Produced water lines, offshore piping, firewater systems, topside process piping | High strength and strong resistance to chloride corrosion and seawater exposure |
| Chemical Processing | Acid handling systems, chlorides service, heat exchanger connections, transfer piping | Good pitting and crevice corrosion resistance with reliable flange sealing performance |
| Power Generation | Cooling water systems, FGD units, condenser and auxiliary piping | Suitable for aggressive water conditions and long service life under cyclic operation |
| Water Treatment | Desalination skids, reverse osmosis plants, brine piping, high-salinity systems | Excellent resistance to seawater and saline media with lower maintenance demand |
| Marine and Offshore | Shipboard piping, ballast systems, seawater intake and discharge lines | Combines corrosion resistance, mechanical strength and reduced weight versus some nickel alloys |
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 a duplex super duplex steel slip on flange?
A: A duplex or super duplex steel slip on flange is a flange that slips over the pipe outside diameter and is welded internally and externally for connection strength. It is made from corrosion-resistant duplex stainless steel grades such as F51, F53 or F55 and is commonly used in offshore, desalination, chemical and seawater piping systems.
Q: What materials are available for duplex super duplex steel slip on flanges?
A: SASA FLANGE commonly supplies ASTM A182 F51, F53 and F55 grades, corresponding to UNS S31803, S32205, S32750 and S32760. Equivalent EN grades such as 1.4462, 1.4410 and 1.4501 can also be produced according to project requirements. Custom materials and dual-certified options may be arranged based on quantity and specification.
Q: What pressure class is supported?
A: These slip on flanges are available in ASME Class 150, 300, 600, 900, 1500 and 2500, as well as EN and DIN pressure ratings such as PN6, PN10, PN16, PN25, PN40, PN63 and PN100. The final pressure class depends on flange size, standard, sealing face type and service condition requirements.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can manufacture custom duplex and super duplex slip on flanges according to drawings or project specifications. We support custom bore, drilling pattern, non-standard outside diameter, special facing such as RF or RTJ, and special material requirements. Machining and inspection records can be provided to match EPC and end-user documentation needs.
Q: What certificate is provided?
A: SASA FLANGE provides EN 10204 3.1 material certificate for duplex and super duplex slip on flanges. Supporting documents can include mill test certificate, chemical analysis, mechanical test reports, dimensional inspection records and PMI results. Hydrostatic testing or third-party inspection can also be arranged when required by project specification or customer purchase order.
Contact Us
If you are looking for duplex super duplex steel slip on flanges 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
