Shanxi Xinshunda Flange Manufacturing Co., Ltd. supplies high-performance API 6B blind flanges engineered for high-pressure oilfield wellhead, manifold, and pipeline end-sealing systems. Fully compliant with API 6A Type 6B, our blind flanges provide reliable metal-to-metal sealing, exceptional pressure retention, and long-term structural integrity for critical oil and gas operations. Backed by 19 years of professional forging and precision machining, we serve as a qualified supplier for global onshore and offshore energy projects.
Product Description
API 6B blind flange is a solid-disc end-closure flange designed for high-pressure service per API 6A Type 6B. It is used to seal, isolate, or pressure-test pipeline ends, wellhead assemblies, and manifold systems. Featuring a precision-machined RTJ ring groove, it achieves zero-leakage metal-to-metal sealing under rated pressure. Our API 6B blind flanges are forged from high-strength alloy steel, fully heat treated, and CNC machined to meet strict dimensional requirements, ensuring perfect interchangeability and safety in harsh oilfield environments.
Product Feature and Application
Key Features
- Solid blind design for pipeline end sealing and pressure isolation
- Full compliance with API 6A Type 6B dimensional standards
- RTJ metal-to-metal sealing for zero leakage under high pressure
- High-strength forging and controlled heat treatment
- Excellent resistance to pressure, fatigue, and corrosion
- High machining precision and full interchangeability
- Full material traceability and complete quality documentation
- Suitable for repeated pressure testing and system maintenance
Typical Applications
- Wellhead equipment and Christmas tree assemblies
- Manifold and pipeline end closure
- High-pressure oil/gas transmission systems
- Pressure testing and well control operations
- Onshore & offshore drilling and production facilities
- Choke & kill line connections
- Isolation and maintenance of critical oilfield piping
Product Parameter
| Standard | API 6A Type 6B |
| Pressure ratings | 2000 psi, 3000 psi, 5000 psi |
| Nominal size | 1-13/16″ – 11″ |
| Face type | Ring Type Joint (RTJ) – R / RX |
| Design | Through-bolted / studded |
| Working temperature | −60 °C to +345 °C |
| Materials |
Carbon steel: A105, A350 LF2 Alloy steel: A182 F11, F22, 4130, 4140 Stainless steel: F304, F316, F316L |
| Certification | API 6A, EN 10204 3.1 MTC |
| Performance level | PR1, PR2 available |
Production Details
Each API 6B blind flange is manufactured under full-process quality control:
- Raw material inspection with mill certificates and spectral analysis
- Closed-die forging for optimized grain structure and mechanical strength
- Standardized heat treatment to meet hardness and tensile requirements
- High-precision CNC machining for RTJ grooves, bolting, and dimensions
- 100% dimensional inspection using CMM and precision gauges
- Full NDT: magnetic particle testing (MT), ultrasonic testing (UT)
- Hydrostatic testing to verify pressure integrity and safety
- Anti-corrosion surface treatment and permanent marking
- Full traceability from raw material to finished product
Production Display
Our factory is ISO 9001 & API Q1 certified, equipped with large-tonnage forging presses, high-rigidity CNC machining centers, automatic heat treatment lines, and professional NDT laboratories. We implement strict process control and complete documentation. Third-party inspection by SGS, BV, TÜV or customer-appointed institutions is available upon request.
Packaging & Transportation
- Surface treatment: Anti-corrosion oil, varnish, black paint
- Packaging: Protective wrapping, reinforced wooden cases, steel pallets
- Labeling: Heat number, size, pressure class, material, standard, API mark, batch
- Documents: Commercial invoice, packing list, certificate of origin, API MTC
- Transportation: Sea, air, and express delivery for global oilfield projects
After-sales Service
We provide full life cycle technical support for API 6B blind flanges:
- Professional consultation on sealing, installation, and testing
- Custom design for special sizes, materials, and RTJ types
- Timely response to after-sales inquiries and quality claims
- On-site technical guidance and remote support
- Stable long-term supply for large-scale oilfield projects
Why Choose Shanxi Xinshunda?
- 19 years of professional flange manufacturing serving global oil & gas clients
- Full compliance with API 6A and international quality standards
- Advanced forging & machining capabilities for high-pressure flanges
- Strict quality control and complete testing & certification documents
- Competitive factory pricing and reliable on-time delivery
- Multilingual sales & technical support and global logistics service
Contact us today for product catalogs, quotations or customized solutions for your API 6B blind flange oilfield projects.
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