Slip-On Raised Face Flange
We manufacture slip-on raised face flanges for industrial piping systems, supplying products according to customer drawings and applicable GB, ASME, JIS and DIN standards. Our stainless steel slip-on flanges are available in grades including 316L, 304L, 321/321H, 310S, 317L, 304H, 347H, 904L and Duplex 2205. Hot forging and precision machining support accurate dimensions, sealing face finish and bolt-hole positioning. Sizes range from 3/8" to 32" (DN10–DN800), with pressure ratings selected according to project specifications.
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 slip-on raised face flanges are used in general piping connections, valve and equipment interfaces, and low-to-medium pressure piping applications, subject to applicable design requirements.
General Piping Connections in Low-to-Medium Pressure Systems
SO flanges slide over the pipe end and are welded both inside and outside, providing strong and reliable connections in low-to-medium pressure piping systems.
Easy Installation and Alignment
The slip-on design allows for easier alignment during installation, reducing fitting time and labor costs compared to weld neck flanges, making them ideal for projects with shorter installation windows.
Connecting Pipes to Valves and Equipment
SO flanges serve as the connection interface between piping systems and valves, pumps, and other equipment, enabling easy assembly, disassembly, and routine maintenance.
Non-Critical Service Conditions
The simpler hub design makes SO flanges a cost-effective choice for general service conditions where high-integrity weld neck flanges are not required.
Quality Control
Each batch of Slip-On 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 height measurement; bolt circle diameter and bolt hole positioning inspection; sealing face flatness inspection; bore diameter verification to ensure proper pipe insertion.
In-Process Control
Real-time monitoring of forging temperature during hot forming process; dimensional inspection of sealing face and bore 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 provide custom CNC machined flange services, including sealing face turning, bore machining and bolt-hole positioning according to customer drawings.
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 and Bore
Specializing in precision turning of flange sealing faces (RF type) and bore machining, strictly controlling flatness, surface roughness, and bore diameter to ensure proper pipe fit and 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 Slip-On 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 is the difference between Slip-On Flanges and Weld Neck Flanges?
Slip-On flanges slide over the pipe and are welded inside and outside, offering easier alignment and lower cost, making them ideal for low-to-medium pressure applications. Weld Neck flanges feature a tapered hub that reduces stress concentration, making them better suited for high-pressure and high-temperature critical services.
What pressure ratings are available for your Slip-On 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 Slip-On 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.