Duplex Steel S31803 Flanges
- Wide Availability: Produced in S31803, S2205, and S2507 duplex steel grades.
- High Strength: Up to twice the yield strength of standard stainless steel flanges.
- Corrosion Resistance: Outstanding ability to withstand stress corrosion cracking in chloride-rich conditions.
- Enhanced Wear Performance: Superior wear resistance compared with stainless steel grades.
- Standards Compliance: Manufactured according to ANSI, DIN, JIS, ISO, GB, and other global standards.
Technical Specifications
| Specification | Details |
| Material | Duplex Steel S31803, S2205, S2507 grades |
| Materials Standards | ANSI, ISO, JIS, DIN, BS, GB, SH, HG, QOST, etc. |
| Flange Types | Socket Welding, Threaded, Blind, Spectacle Blind, Slip-on, Welding Neck |
| Manufacturing Standards | ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 |
| Specification Range | 2″-24″ |
| Thickness Options | STD, SCH40, SCH80, SCH160, SCHXX |
| Pressure Grades | Class150, Class300, Class600, Class900, Class1500, Class2500 |
| Application | Petroleum, Chemical, Shipbuilding, Metallurgy, Electricity, Mechanical Industries |
| Packaging | Seaworthy Plywood Cases or pallets, or per customer request |
| Delivery Time | 20-35 days |
| Quality Control | ISO 9001 certified, with tests including PMI, PT, MT, UT, RT, VT and 3.1/3.2 mill test reports |
| Markets | Europe, US, North America, Asia |
Applications
- Oil & Gas Industry: For pipelines, equipment connections, and offshore platforms.
- Shipbuilding: Ideal for marine environments due to high corrosion resistance.
- Petrochemical: Perfect for high-pressure, high-temperature applications in refining and chemical plants.
- Power Generation: For steam, gas, and nuclear power plant equipment.
- Metallurgy & Heavy Industry: Used in various industrial machinery that demands high strength and corrosion resistance.
Raw Materials
We produce and purchase raw materials strictly according to customer requirements, ensuring full compliance with project specifications, mechanical properties, and international standards.
Main steel grades we produce:
Steel Grade | Standards | Classification | Products |
1.4301, 1.4307, 1.4401, 1.4404, 1.4541, 1.4871 | EN 10222-5 | L | Forged flanges and Forged parts |
F304, F304L, F316, F316L, F321, F316T, F310, F904L | ASTM A182 | L | Forged flanges and Forged parts |
F51, F53, F55, F60 | ASTM A182 | L | Forged flanges and Forged parts |
LF2 | ASTM A350 | V | Forged flanges and Forged parts |
F11, F22 | ASTM A182 | V | Forged flanges and Forged parts |
A105 | ASTM A105 | N | Forged flanges and Forged parts |
CNC Machining Capabilities
We operate multiple machining lines and CNC centers engineered to deliver tight tolerances, superior surface finishes, and consistent quality for complex forged components.
Equipments and Quantities | ||
Item No. | Equipments | Quantities |
1 | Ramp CNC lathe | 6 |
2 | Normal lathe | 8 |
3 | Machining center | 4 |
4 | CNC lathe | 10 |
Inspection & Quality Control
To ensure the high quality of non-standard flanges, we are equipped with professional testing and inspection systems:
- 3D Measurement Equipment
- Ultrasonic Cleaning Machine
- Physical & Chemical Testing
- Dimensional Inspection
Packaging for Non-Standard Flanges
We provide protective packaging options according to customer needs:
- Anti-rust treatment
- Plastic film wrapping
- Wooden cases
- Wooden pallets
- Custom packaging available
Why Choose Boberry
Complete In-House Manufacturing
Integrated forging, heat treatment, machining, and inspection ensure stable quality, faster lead times, and full control over every production stage.
European-Market Proven Quality
Long-term supply to Germany, Austria, Switzerland, and Nordic countries demonstrates our ability to meet strict technical standards and customer expectations.
Custom Engineering Support
Tailor-made stainless-steel parts based on your drawings, with trial samples available to validate design, performance, and fit before full-scale production.