Sealing Flanges
- Wide Size Range: Diameter from 50 mm to 1200 mm or up to 80 kg per flange.
- High Precision Tolerance: Machining accuracy controlled within 0.05 mm for stable sealing performance.
- Premium Materials: Stainless steel, super duplex steel, F55, F60, 904L and other special alloys available.
- Flexible Design Capability: Any complicated shapes, special structures, and custom sealing surfaces are supported.
- Sample Support: Prior to mass production, up to two complimentary samples are available for testing and verification.
Technical Specifications
| Item | Specification |
| Product Type | Sealing Flanges |
| Diameter Range | 50 mm – 1200 mm |
| Maximum Weight | ≤ 80 kg per flange |
| Dimensional Tolerance | Within 0.05 mm |
| Standard Materials | Stainless steel, super duplex steel, F55, F60, 904L |
| Other Materials | Special alloys and customer-specified materials on request |
| Design Basis | According to customer drawings, standards, or application requirements |
| Sealing Types | Flat face, raised face, ring-type joint, and customized sealing surfaces |
| Sample Policy | 2 free samples available (subject to confirmation) |
| Typical Working Conditions | High pressure, corrosive media, critical sealing environments |
Customization Options
- Customized diameters, thicknesses, and bore sizes according to client drawings.
- Choice of sealing face: flat face, raised face, RTJ, and special groove profiles.
- Material customization using stainless, super duplex, F55, F60, 904L, or other specified alloys.
- Special machining for complex shapes, offset bores, multi-port flanges, and non-standard designs.
- Surface treatment options such as machining finish, polishing, coating, or passivation.
- Tailored bolt hole patterns, drilling standards, and connection interfaces.
- Prototype development and small-batch trial runs supported with 2 free samples.
Applications
- Oil & gas pipelines and manifolds requiring high-integrity sealing.
- Petrochemical and chemical processing equipment with corrosive media.
- Steam lines, high-pressure systems, and power plants.
- Offshore and marine piping systems using corrosion-resistant alloys.
- Pressure vessels, reactors, and storage tanks with critical flange joints.
- General industrial fluid, gas, and vacuum systems needing reliable sealing.
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.