Super duplex flanges
High-Strength Super Duplex Steel Flanges Exporter in Oman
Super duplex steel flanges are available in grades such as S32750 (F53) and S32760 (F55). As premium stainless flanges, SDSS grades give excellent corrosion resistance and mechanical strength compared to standard duplex steel flanges.
At a glance
- Grades: S32750 (F53) and S32760 (F55)
- Corrosion: excellent resistance, including chloride-induced stress corrosion cracking
- Strength: higher yield and tensile strength than standard DSS
- Fatigue: suits cyclic loading applications
- Types: blind, slip-on, weld neck, socket weld, lap joint, threaded
Top Manufacturer of Super Duplex Stainless Steel Blind Flanges in Oman
DuplexPipeline manufactures super duplex flanges in Mumbai for demanding industrial service.
| Parameter | Details |
| Material | Super duplex stainless steel (SDSS) |
| Grades | S32750 (F53), S32760 (F55) |
| Size range | 1/2″ – 48″ |
| Pressure class | 150 – 2500 |
| Face types | RTJ, RF, FF, T&G |
| Supply | Made in India, shipped to the Oman and worldwide |
Which Grade Is Used?
| Grade | UNS number | Notes |
| F53 | S32750 | SDSS grade with excellent corrosion resistance |
| F55 | S32760 | Alternative SDSS grade, chosen by project needs |
Both grades give better corrosion resistance than standard austenitic stainless steel.
Why Super Duplex Steel Flanges Stand Out?
- Chloride resistance: withstands a wide range of corrosive conditions
- Stress corrosion cracking: super duplex flanges resist chloride-induced cracking
- Heavy-duty strength: handles high loads and pressures without losing performance
- Fatigue resistance: reliable under cyclic loading
- Higher strength than standard DSS: better yield and tensile values
Forged vs Threaded Flanges
Super duplex flanges come in forged and threaded types:
| Feature | Forged flange | Threaded flange |
| Face | Raised or flat face with bolt holes | Internal threads |
| Joining | Easily welded to pipes or flanges | Secure connection without welding |
| Best when | Welding is practical | Welding is not practical, such as blind or lap joint positions |
Super duplex flanges
Super duplex pipe flanges
SDSS socket weld flange
Types of Super Duplex Stainless Steel Flanges
Our super duplex steel flanges are available in these types for Oman projects:
| Flange type | Key details | Typical use |
| Blind | Pressure class 150 – 2500, oil varnish coating | Sealing pipe or vessel ends |
| Slip-on | Size 1/2″ – 48″ | General piping, high strength and toughness |
| Weld neck | Strong corrosion resistance | Aggressive environments |
| Socket weld | Leak-free once properly welded | Secure pipe connections |
| Lap joint | Faces: RTJ, RF, FF, T&G | Systems needing frequent disassembly |
| Threaded | Internal threads | Joints where welding is not preferred |
Super duplex blind flange
- Size: Tensile Strength: 415 MPa
- Coating: oil varnishe
- Pressure class: 150 – 2500
Super duplex slip on flange
- Application: airpspece
- Size: 1/2″ – 48″
- Type: blind,slip on, weld neck
SDSS lap joint flange
- Face type: Rtj, RF, FF, T&G
- Yield Strength: 290 MPa
- Elongation: 50mm
Specification of Super Duplex Flanges
Chemical composition (%)
| Element | F53 (S32750) | F55 (S32760) |
| Carbon (C) | 0.030 max | 0.030 max |
| Manganese (Mn) | 1.20 max | 1.00 max |
| Silicon (Si) | 0.80 max | 1.00 max |
| Phosphorus (P) | 0.035 max | 0.030 max |
| Sulphur (S) | 0.020 max | 0.010 max |
| Chromium (Cr) | 24.0 – 26.0 | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 | 3.0 – 4.0 |
| Nitrogen (N) | 0.24 – 0.32 | 0.20 – 0.30 |
| Copper (Cu) | 0.50 max | 0.50 – 1.00 |
| Tungsten (W) | – | 0.50 – 1.00 |
Mechanical properties
| Property | F53 (S32750) | F55 (S32760) |
| Tensile strength | 800 MPa min | 750 MPa min |
| Yield strength | 550 MPa min | 550 MPa min |
| Elongation | 15% min | 25% min |
| Hardness | 310 HB max | 310 HB max |
Super Duplex Steel Flanges Stock in Mumbai for the Oman
- Our super duplex steel flanges stock covers blind, slip-on, weld neck, socket weld, lap joint and threaded types
- Grades S32750 (F53) and S32760 (F55)
- Sizes from 1/2″ to 48″, pressure classes 150 – 2500
- Face types: RTJ, RF, FF and T&G
- To check current super duplex steel flanges stock for the Oman, send your grade, size, class, face type and quantity
Buy Super Duplex Steel Flanges in the Oman from DuplexPipeline
When you buy super duplex steel flanges from us, you get:
- Flanges built to exact industry specifications
- Visual, dimensional, magnetic particle and radiographic inspection
- Quality assurance and worldwide shipping, including the Oman
How to order
- Share grade, size, pressure class, flange type and quantity
- Receive datasheet and quote
- Confirm the order
Quality Tests for Super Duplex Steel Flanges
| Test | What it checks |
| Visual inspection | Surface irregularities and cracks |
| Dimensional inspection | Diameter and thickness tolerances |
| Magnetic particle testing | Surface cracks and discontinuities |
| Radiographic testing (RT) | Internal structure and defects, using X-rays or gamma rays |
Impact on Piping Efficiency and Corrosion Resistance
- Weld neck flanges: excellent corrosion resistance in aggressive environments
- Fewer failures: super duplex steel flanges reduce corrosion-related failures and leaks
- Slip-on flanges: high strength and toughness keep structures sound under heavy loads
- Socket weld flanges: secure, leak-free connection once properly welded
- Chromium: forms a protective barrier against corrosive agents
- Molybdenum: boosts resistance to pitting and crevice corrosion in chloride-rich environments
Frequently Asked Questions
Super duplex flanges — Questions Buyers Ask Most
What is a blind flange used for?
What is the difference between SS flanges and duplex flanges?
SS flanges are austenitic Duplex flanges combine austenite and ferrite for higher strength and corrosion resistance
When should I use a lap joint flange?
What does flange stainless grade mean?
The stainless steel grade used, which affects corrosion resistance, strength and suitability
Are super duplex steel flanges suitable for offshore use in the Oman?
These SD flanges are typically available in grades such as S32750 also known as F53 and S32760 or F55. The SDSS grades offer excellent corrosion resistance and mechanical properties compared to standard duplex stainless steel.
Other steel grades such as UNS S32760 may also be used for SDSS materials depending on specific needs and requirements. These grades of SDSS provide superior corrosion resistance as compared to other standard austenitic stainless steel.
Top Manufacturer of Super Duplex Stainless Steel Blind Flanges in India
Super duplex flanges are resistant to a wide range of corrosive conditions including chloride-induced stress corrosion cracking. The SDSS flanges offer high strength and can withstand heavy loads and pressures.
We are a leading super duplex flanges manufacturer in India, have higher yield and tensile strength compared to standard DSS. They also show excellent resistance to fatigue which makes them suitable for cyclic loading applications.
These stainless flanges have higher yield and tensile strength compared to standard duplex stainless steels. They also show excellent resistance to fatigue which makes them suitable for cyclic loading applications.
Duplex Pipeline: Experts in Super Duplex Slip-On Flanges – Know the Difference Between Forged and Threaded Flanges
Super duplex flanges
Super duplex pipe flanges
SDSS socket weld flange
Forced flanges have a raised face or a flat face with bolt holes. This allows the forced flange to be easily welded to other pipes or flanges without any hassles and difficulties.
SDSS threaded flanges, on the other hand, have internal threads. The threads in the flange provide the means for a secure connection without requiring welding
Refer to Duplex Pipeline specification table to choose the right super Duplex Flange for Your Need
We are high quality super duplex stainless steel flanges supplier in Mumbai
Ensuring Quality in Super Duplex Weld Neck Flanges Through Rigorous Testing
Super duplex blind flange
- Tensile Strength: 415 MPa
- Coating: oil varnishe
- Pressure class: 150 – 2500
Super duplex slip on flange
- Application: airpspece
- Size: 1/2″ – 48″
- Type: blind,slip on, weld neck
SDSS lap joint flange
- Face type: Rtj, RF, FF, T&G
- Yield Strength: 290 MPa
- Elongation: 50mm
DuplexPipeline Offers Super Duplex Threaded Flanges in Multiple Equivalent Grades for Broad System Compatibility
Visual inspection involves a visual examination of the SDSS blind flange for any visible defects, such as surface irregularities and cracks. On the other hand, in dimensional inspection, verifies the dimensions and tolerances of the blind flange such as diameter and thickness are checked.
The Magnetic Particle Testing Method is used by steel manufacturers to detect surface defects in the SDSS flange such as cracks or discontinuities. RT process uses X-rays or gamma rays to examine the internal structure and defects of the blind flange.
SDSS weld neck flanges offer excellent corrosion resistance, especially in aggressive environments. The use of super duplex pipe flanges considerably reduces the danger of corrosion-related failures and leaks in the piping system
A SDSS slip on flange with high strength and toughness qualities, ensure structural integrity and withstand heavy loads. A SDSS socket weld flange offers a secure and leak-free connection when properly welded to the pipes.
The precise alloying elements and their percentage composition affect a flange’s capacity to resist corrosion in diverse situations. The chromium layer of the SDSS threaded flange offers excellent corrosion resistance by acting as a barrier against agents.
Molybdenum enhances the corrosion resistance of the SDSS lap joint flange especially in environments containing chlorides. It increases the resistance of the flange against pitting and crevice corrosion.
