- Excellent corrosion resistance in chloride environments
- High mechanical strength and toughness
- Superior resistance to pitting and crevice corrosion
- Good weldability and fabrication properties
High-Strength Duplex Stainless Steel Flange 2205 2507
Duplex Flange is manufactured from duplex stainless steel, offering an excellent combination of high mechanical strength and superior corrosion resistance. Duplex stainless steel flanges are widely used in aggressive industrial environments where standard stainless steel materials may not provide sufficient performance.
Duplex flanges are ideal for use in offshore platforms, chemical processing plants, oil & gas pipelines, marine systems, and heat exchanger applications. Their dual-phase microstructure provides enhanced resistance to pitting, crevice corrosion, and stress corrosion cracking.
Key Features of Duplex Flange
- Excellent corrosion resistance in chloride environments
- High mechanical strength and toughness
- Superior resistance to pitting and crevice corrosion
- Good weldability and fabrication properties
- High resistance to stress corrosion cracking
- Suitable for high-pressure applications
- Long service life in harsh environments
Duplex Flange Specifications
| Specification | Details |
|---|---|
| Material Grade | Duplex Stainless Steel |
| Product Type | Stainless Steel Flange |
| Standards | ASTM A182 / ASME B16.5 / DIN / EN |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint |
| Pressure Rating | Class 150 to Class 2500 |
| Size Range | 1/2” to 48” |
| Surface Finish | Machined, Polished, Pickled |
| Application | Oil & Gas, Marine, Chemical |
Common Duplex Stainless Steel Grades
We supply duplex stainless steel flanges in various material grades to meet different industrial requirements.
Available Grades
- Duplex 2205 Flange
- Super Duplex 2507 Flange
- Duplex S31803 Flange
- Duplex S32205 Flange
- Super Duplex S32750 Flange
- Super Duplex S32760 Flange
Chemical Composition of Duplex Stainless Steel Flange
| Element | Typical Range (%) |
| Chromium (Cr) | 21.0 – 26.0 |
| Nickel (Ni) | 4.5 – 8.0 |
| Molybdenum (Mo) | 2.5 – 4.5 |
| Nitrogen (N) | 0.10 – 0.30 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Iron (Fe) | Balance |
Applications of Duplex Flange
Duplex stainless steel flanges are widely used in industries requiring superior corrosion protection and mechanical strength.
Common Applications
- Offshore and subsea systems
- Oil & gas processing plants
- Chemical and petrochemical industries
- Marine and shipbuilding equipment
- Heat exchangers and pressure vessels
- Water treatment and desalination plants
- Power generation facilities
Types of Duplex Stainless Steel Flanges
We offer a wide range of duplex flange configurations for different piping system needs.
Available Flange Types
- Duplex Weld Neck Flange
- Duplex Slip-On Flange
- Duplex Blind Flange
- Duplex Socket Weld Flange
- Duplex Threaded Flange
- Duplex Lap Joint Flange
Packaging & Delivery
Our duplex stainless steel flanges are carefully packaged to prevent corrosion, scratches, and shipping damage.
Packaging Options
- Export-grade packaging
- Wooden crates and pallets
- Waterproof wrapping
- Custom packaging available upon request
Request a Quote
Contact us now for a quotation
Email: sales@hengyimetal.com
WhatsApp: +86 19521258704
| Parameter | Details |
|---|---|
| Material Grades | Grade: 200 Series: 201,202 Duplex stainless steel :2205,2507,2906,330,660,630,631,17-4ph,17-7ph, S318039 904L,etc |
| Standards | ANSI B16.5, ASME B16.5, ASTM A182, API 6A |
| Pressure Classes | 150, 300, 600, 900, 1500, 2500 |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint |
| Size Range | 1/2″ to 60″ (custom sizes available) |
| Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Surface Finish | Smooth machined, serrated, or custom |
Flange Types & Applications
| Flange Type | Description | Typical Applications |
|---|---|---|
| Weld Neck | Features a tapered hub for high-strength, high-pressure applications | High-pressure pipelines, refineries, power plants |
| Slip-On | Slides over pipe and welded both inside and outside | Low to medium pressure applications, general industrial |
| Blind | Solid flange used to close pipe ends or pressure vessels | Pipe termination, maintenance access points |
| Socket Weld | Pipe inserts into socket and welded | Small diameter, high-pressure systems |
| Threaded | Internal threads for connection without welding | Low pressure, non-critical applications |
| Lap Joint | Used with stub end for easy alignment | Systems requiring frequent disassembly |
| Material Supply: | ||||||||||||
ASTM/ASME | EN Grade | Chemical Component % | ||||||||||
C | Cr | Ni | Mn | P | S | Mo | Si | Cu | N | Other | ||
201 | ≤0.15 | 16.00-18.00 | 3.50-5.50 | 5.50－7.50 | ≤0.060 | ≤0.030 | – | ≤1.00 | – | ≤0.25 | – | |
301 | 1.4310 | ≤0.15 | 16.00-18.00 | 6.00-8.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤1.00 | – | 0.1 | – |
304 | 1.4301 | ≤0.08 | 18.00-20.00 | 8.00-10.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | – | – |
304L | 1.4307 | ≤0.030 | 18.00-20.00 | 8.00-10.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | – | – |
304H | 1.4948 | 0.04~0.10 | 18.00-20.00 | 8.00-10.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | – | – |
309S | 1.4828 | ≤0.08 | 22.00-24.00 | 12.00-15.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | – | – |
309H | 0.04~0.10 | 22.00-24.00 | 12.00-15.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | – | – | |
310S | 1.4842 | ≤0.08 | 24.00-26.00 | 19.00-22.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤1.5 | – | – | – |
310H | 1.4821 | 0.04~0.10 | 24.00-26.00 | 19.00-22.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤1.5 | – | – | – |
316 | 1.4401 | ≤0.08 | 16.00-18.50 | 10.00-14.00 | ≤2.00 | ≤0.045 | ≤0.030 | 2.00-3.00 | ≤0.75 | – | – | – |
316L | 1.4404 | ≤0.030 | 16.00-18.00 | 10.00-14.00 | ≤2.00 | ≤0.045 | ≤0.030 | 2.00-3.00 | ≤0.75 | – | – | – |
316H | 0.04~0.10 | 16.00-18.00 | 10.00-14.00 | ≤2.00 | ≤0.045 | ≤0.030 | 2.00-3.00 | ≤0.75 | – | 0.10-0.22 | – | |
316Ti | 1.4571 | ≤0.08 | 16.00-18.50 | 10.00-14.00 | ≤2.00 | ≤0.045 | ≤0.030 | 2.00-3.00 | ≤0.75 | – | – | Ti5(C+N)~0.7 |
317L | 1.4438 | ≤0.03 | 18.00-20.00 | 11.00-15.00 | ≤2.00 | ≤0.045 | ≤0.030 | 3.00-4.00 | ≤0.75 | – | 0.1 | – |
321 | 1.4541 | ≤0.08 | 17.00-19.00 | 9.00-12.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | 0.1 | Ti5(C+N)~0.7 |
321H | 1.494 | 0.04~0.10 | 17.00-19.00 | 9.00-12.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | 0.1 | Ti4(C+N)~0.7 |
347 | 1.4550 | ≤0.08 | 17.00-19.00 | 9.00-13.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | – | Nb≥10*C%-1.0 |
347H | 1.4942 | 0.04~0.10 | 17.00-19.00 | 9.00-13.00 | ≤2.00 | ≤0.045 | ≤0.030 | – | ≤0.75 | – | – | Nb≥8*C%-1.0 |
409 | S40900 | ≤0.03 | 10.50-11.70 | 0.5 | ≤1.00 | ≤0.040 | ≤0.020 | – | ≤1.00 | – | 0.03 | Ti6(C+N)-0.5 Nb0.17 |
430 | S43000 | ≤0.12 | 16.00-18.00 | 0.75 | ≤1.00 | ≤0.040 | ≤0.030 | – | ≤1.00 | – | – | – |
436 | S43600 | ≤0.025 | 16.00-19.00 | – | ≤1.00 | ≤0.040 | ≤0.030 | 0.75-1.0 | ≤1.00 | ≤0.025 | Nb+Ti:8(C+N)~0.80 | |
439 | S43035 | ≤0.030 | 17.50-18.50 | – | ≤1.00 | ≤0.040 | ≤0.015 | – | ≤1.00 | – | ≤0.030 | Ti+Nb:0.2+4C~0.75 |
441 | S44100 | ≤0.030 | 17.50-18.50 | – | ≤1.00 | ≤0.040 | ≤0.015 | – | ≤1.00 | – | ≤0.030 | Ti:0.1-0.6 Nb:3C+0.3~1.0 |
442 | S44200 | ≤0.025 | 18.0-23.0 | – | ≤1.00 | ≤0.040 | ≤0.035 | – | ≤1.00 | – | ||
443 | S44300 | ≤0.025 | 19.5-22.0 | – | ≤1.00 | ≤0.035 | ≤0.015 | – | ≤1.00 | – | ≤0.025 | Nb+Ti:0.2+4(C+N)~0.75 |
444 | S44400 | ≤0.025 | 17.00-20.00 | – | ≤1.00 | ≤0.040 | ≤0.030 | 1.75-2.5 | ≤1.00 | ≤0.035 | Ti+Nb:0.2+4(C+N)~0.8 | |
446 | S44600 | ≤0.2 | 23.0-27.0 | 0.75 | ≤1.50 | ≤0.040 | ≤0.030 | – | ≤1.00 | 0.25 | ||
410 | 1Cr13 | 0.08~0.15 | 11.50-13.50 | – | ≤1.00 | ≤0.040 | ≤0.030 | – | ≤1.00 | – | – | – |
410J1 | 1Cr13Mo | 0.08-0.18 | 11.50-14.00 | – | ≤1.00 | ≤0.040 | ≤0.030 | 0.30-0.60 | ≤1.00 | – | – | – |
420 | 2Cr13 | ≥0.15 | 12.00-14.00 | – | ≤1.00 | ≤0.040 | ≤0.030 | – | ≤1.00 | – | – | – |
420J2 | 3Cr13 | 0.26-0.35 | 12.00-14.00 | – | ≤1.00 | ≤0.040 | ≤0.030 | – | ≤1.00 | – | – | – |
4Cr13 | 0.36-0.45 | 12.00-14.00 | – | ≤1.00 | ≤0.040 | ≤0.030 | – | ≤1.00 | – | – | – | |
431 | 1Cr17Ni2 | ≤0.2 | 15.00-17.00 | 1.25-2.50 | ≤1.00 | ≤0.040 | ≤0.030 | – | ≤1.00 | – | – | – |
440C | 11Cr17 | 0.95-1.20 | 16.00-18.00 | – | ≤1.00 | ≤0.040 | ≤0.030 | 0.75 | ≤1.00 | – | – | – |
17-4PH | 630/1.4542 | ≤0.07 | 15.50-17.50 | 3.00-5.00 | ≤1.00 | ≤0.040 | ≤0.030 | – | ≤1.00 | 3.00-5.00 | – | Nb+Ta:0.15-0.45 |
17-7PH | 631 | ≤0.09 | 16.00-18.00 | 6.50-7.50 | ≤1.00 | ≤0.040 | ≤0.030 | – | ≤1.00 | – | – | Al 0.75-1.50 |
