Blind Flanges
- Material Variety: Made from A182 F304/304L, F316/316L, 317, 904L, and more for superior durability and corrosion resistance.
- Wide Size Range: Sizes from 15mm to 6000mm to meet a variety of applications.
- Sealing Surface Types: Flat, convex, concave, and grooved surfaces to meet specific sealing requirements.
- Surface Treatment: Anti-rust oil or painting to protect against corrosion.
- Easy Installation & Maintenance: The flange can be easily bolted and disassembled, making it suitable for maintenance and isolation purposes.
Technical Specifications
| Parameter | Specification |
| Size Range | 15mm – 6000mm |
| Type | Blind |
| Standard | ANSI B16.5, DIN, JIS, GOST, BS, EN |
| Material Grades | A182 F304/304L, F316/316L, 317, 904L |
| Pressure Class | 150# – 2500# |
| Surface Treatment | Anti-Rust Oil or Painting |
| Applications | Petroleum, Refining, Fertilizer, Power Stations, Shipbuilding |
| Size Packing | 8″ and below: Plywood case; 10″ and above: Plywood pallet |
Customization & OEM Service
- Custom Sizes & Materials: We provide tailored sizes, materials, and sealing surface types to match your specific application needs.
- Customized Sealing Surfaces: Choose from flat, convex, concave-convex, grooved, or ring joint surfaces to meet the pressure and sealing requirements of your system.
- Non-Standard Designs: For special applications, we can offer customized design and engineering support to meet the unique requirements of your project.
- Quick Turnaround for Prototypes: We offer rapid prototyping services for small orders and specialized designs.
- Reverse Engineering: We can duplicate flanges from customer-provided samples or drawings.
Applications
- Petroleum & Petrochemical (isolation of pipelines, pressure control)
- Refineries & Fertilizer Plants (pipe sealing, system isolation)
- Power Generation (pipe termination and isolation)
- Shipbuilding & Offshore Platforms (corrosion-resistant sealing for marine systems)
- Waterworks & Wastewater (sealing and isolation of sections of pipelines)
- General Industrial Piping Systems (isolation during maintenance)
Manufacturing Capabilities
Forging Facilities
- 6300T / 3150T / 2000T free hydraulic presses.
- 5T, 3T, 2T, 1T, 750kg, 560kg electro-hydraulic hammers.
Heating Treatment Facilities
- RTX-9 series trolley furnaces in multiple sizes (5.5–8 m chamber length).
- RJ-9-850KW vertical furnace with 15 m depth.
- RTX-12-350KW high-temperature trolley furnace.
Machining Facilities
- CNC machines (max 32-ton load).
- Heavy-duty lathes and vertical mills (up to 70 tons).
- Gantry milling machines, deep-hole boring machines, grinding and turning centers.
Testing & Quality Control
- Spectrum analysis for chemical composition.
- Ultrasonic, non-destructive, and metallographic testing.
- Mechanical property test machines for yield, tensile, hardness.
Production Process
- Raw Material Selection: Use first-grade ingot steel, inspect chemical composition.
- Forging: Heat to precise temperature, perform open die or die forging.
- Heat Treatment: Quenching, tempering, or normalizing to meet mechanical targets.
- Machining: CNC turning, boring, milling, grinding, and drilling to precision ±0.01 mm.
- Inspection: Each shaft tested via 100% ultrasonic, hardness, and tensile checks.
- Packaging & Delivery: Anti-corrosion coating, safe transport packaging, global logistics support.
Additional Value-added Services
- Quench-and-temper heat treating
- Rough and finish turning
- Ultrasonic and mechanical testing
- Dimensional inspection reports
- Customized design and programming support
Quality Assurance
- Each forging carries a test bar for mechanical testing.
- 100% ultrasonic and visual inspection before shipment.
- Hardness, tensile, and metallographic verification.
- Compliance with ASTM, DIN, GB, and EN standards.
Why Choose Boberry
Integrated Production
Complete forging-to-machining production line ensures precision and fast delivery.
Advanced Equipment
Heavy-duty forging presses and CNC systems handle large, complex mechanical component geometries.
Certified Assurance
Certified production with ISO9001, PED, SGS compliance and global OEM support.
Logistics & Delivery
Lead Time: 15–30 days (urgent) / 30–45 days (normal).
Monthly Capacity: 500–1000 tons.
Packing: Wooden crates, steel frames, or per client request.
Shipment: By Sea (recommended, saves cost for forging parts) / By Air (fast but expensive).
Payment Terms: 30% deposit with balance via B/L copy; or 100% L/C at sight.
Delivery Terms: FOB, CIF, CNF.
Monthly Capacity: 500–1000 tons.
Packing: Wooden crates, steel frames, or per client request.
Shipment: By Sea (recommended, saves cost for forging parts) / By Air (fast but expensive).
Payment Terms: 30% deposit with balance via B/L copy; or 100% L/C at sight.
Delivery Terms: FOB, CIF, CNF.