Weld Neck Raised Face Flange
We manufacture weld neck raised face flanges for industrial piping systems, supplying products to customer drawings and international standards, including GB, ASME, JIS and DIN. Our stainless steel weld neck flanges are available in grades including 316L, 304L, 321/321H, 310S, 317L, 304H, 347H, 904L and Duplex 2205. Hot forging and precision machining support the required dimensions, raised face finish and bolt-hole positioning. Sizes range from 3/8" to 32" (DN10–DN800), with pressure ratings and specifications selected according to project requirements.
Specifications
| Parameter | Specification |
|---|---|
| Material | 317L, 310S, 304H, 347H, Duplex 2205, 321/321H, 904L/304L, 316L |
| Process | Hot Forging |
| Size Range | 3/8"–32" (DN10–DN800) |
| Standards | GB, ASME, JIS, DIN |
| Pressure Rating | PN1.0MPa, PN1.6MPa, 150LB, 300LB, 10K, 16K |
Production Process
Every step is strictly controlled — from raw material to final shipment.
Applications
Our weld neck raised face flanges are used in industrial piping systems, equipment connections and applications requiring reliable flange joints.
Pipe-to-Pipe Connection in High-Pressure Systems
WN flanges are welded to pipes and bolted together, providing reliable connections in high-pressure and high-temperature piping systems, commonly used in main pipeline sections requiring structural integrity.
Valve and Equipment Connection
WN flanges serve as the connection interface between piping systems and valves, pumps, compressors, pressure vessels, and other equipment, enabling easy installation, disassembly, and maintenance.
Pipeline Branching and Tie-in Points
WN flanges are used at branching and tie-in points where pipelines divide or connect to secondary lines, ensuring secure and leak-proof junctions in complex piping networks.
Critical Service Conditions Requiring High Integrity
The tapered hub design of WN flanges reduces stress concentration at the weld joint, making them the preferred choice for critical services including high-temperature, high-pressure, and cyclic loading conditions.
Quality Control
Each batch of Weld Neck Flanges undergoes the following quality control procedures:
Incoming Material Inspection
Verification of material certificates (chemical composition and mechanical properties); confirmation of material grade per order requirements; visual inspection of forging blanks for surface defects.
Dimensional Inspection
Outer diameter, inner diameter, thickness, and hub length measurement; bolt circle diameter and bolt hole positioning inspection; sealing face flatness inspection.
In-Process Control
Real-time monitoring of forging temperature during hot forming process; dimensional inspection of sealing face and hub after machining; sealing face surface roughness inspection.
Batch Traceability
Heat number, production date, material test reports, and dimensional inspection records fully archived; all inspection data traceable per batch.
Customization
We offer comprehensive build-to-print manufacturing services for Weld Neck Flanges:
Hot Forging Forming
Utilizing advanced hot forging equipment for one-step forming of flange blanks, ensuring dense internal structure, uniform grain distribution, and excellent mechanical properties.
Precision Machining of Sealing Face
Specializing in precision turning of flange sealing faces (RF type), strictly controlling flatness and surface roughness to ensure reliable sealing performance.
Bolt Hole Drilling and Positioning
Professional drilling of bolt holes with strict control of bolt circle diameter and hole positioning accuracy, ensuring precise alignment with matching flanges and easy field installation.
Custom Marking
Supports steel stamp marking per customer requirements, including material grade, pressure rating, size, standard, and heat number for full traceability.
FAQ
Find answers to common questions about our products, services, and support.
What standards do you manufacture Weld Neck Flanges to?
We manufacture flanges per international standards including GB (Chinese National Standard), ASME (American Society of Mechanical Engineers), JIS (Japanese Industrial Standard), and DIN (German Standard). We also support custom manufacturing per customer drawings.
What pressure ratings are available for your Weld Neck Flanges?
We offer a wide range of pressure ratings including PN1.0MPa, PN1.6MPa, 150LB, 300LB, 10K, and 16K to meet various working condition requirements.
How do you ensure the sealing performance of flanges?
We strictly control the flatness and surface roughness of the sealing face (RF type) through precision turning. Each flange undergoes dimensional inspection before shipment to ensure sealing performance meets standard requirements.
What is the hot forging process? What are its advantages?
Hot forging involves heating metal to a plastic state and forming it under pressure. This process refines the grain structure, eliminates internal porosity, and enhances mechanical properties including strength, toughness, and fatigue resistance.