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| Standard: | ANSI, DIN, GB, JIS, GOST |
| Type: | Welding Flange |
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Stainless Steel Forged SO Flange
A Stainless Steel Slip-On Flange (SO Flange), also known as a Slip-On Neck Flange, is a widely used pipe connecting component. It is designed to be slipped over the end of a pipe and then welded both inside and outside to provide sufficient strength and prevent leakage. Its combination of ease of installation and cost-effectiveness makes it a popular choice for a wide range of medium and low-pressure applications.
Key Features & Overview
The defining feature of the SO flange is its low hub or neck that the pipe slides into. The primary welding involves two fillet welds: one on the hub's outside and one on the inside, making the connection robust.
Main Characteristics:
Ease of Alignment: The bolt holes are full circles, making it significantly easier to align with the bolt holes of a matching flange during assembly compared to other types like lap joint flanges.
Cost-Effective:Generally less expensive to manufacture and purchase than comparable Welding Neck (WN) flanges.
Requires Welding:Involves more welding than a socket weld flange but is structurally stronger for its class.
Pressure Limitations: Due to its design and the nature of the connection, it is best suited for low-pressure and non-cyclic services. Its fatigue strength is lower than that of a welding neck flange.
Technical Specifications & Standards
SO flanges are manufactured to adhere to international standards to ensure compatibility and safety.
Common Standards:
ASME/ANSI B16.5: The most common standard for pipe flanges and flanged fittings in North America and internationally for sizes NPS ½" to 24".
ASME/ANSI B16.47: Covers larger diameter flanges (NPS 26" to 60").
EN 1092-1: The European standard common in the UK and EU.
MSS SP-44:Standard practice for steel pipeline flanges.
AWWA C207: Standard for steel pipe flanges for waterworks services.
Pressure Classes:
Common ASME pressure classes are Class 150, Class 300, Class 600, etc. Common PN (Pressure Nominal) ratings per EN standards are PN6, PN10, PN16,PN25, PN40. The dimensions (thickness, bolt hole size, and number of bolts) change with each pressure class.
Facing Types:
The most common facing is the Raised Face (RF). Other types include Flat Face (FF), Ring-Type Joint (RTJ), Tongue and Groove (T&G), and Male and Female (M&F).
Material & Properties
The stainless steel material grants the flange its excellent corrosion resistance and mechanical properties.
Common Stainless Steel Grades:
304 / 304L: The most common "18-8" chromium-nickel grade. 304L has a lower carbon content for improved weldability and resistance to intergranular corrosion.
316 / 316L: Contains molybdenum, providing superior resistance to pitting and crevice corrosion, especially in chloride environments. 316L is the low-carbon version.
321: Stabilized with titanium for high-temperature service.
Mechanical Properties (Example for ASTM A182 F304/F304L):
Tensile Strength: ≥ 70 ksi (515 MPa)
Yield Strength: ≥ 30 ksi (205 MPa)
Elongation: ≥ 30%
Primary Applications
Stainless Steel SO Flanges are used across numerous industries where corrosion resistance is required:
Chemical & Petrochemical Processing: Handling acids, solvents, and other corrosive media.
Food & Beverage / Pharmaceutical: Used in hygienic and sanitary processing lines due to ease of cleaning and corrosion resistance.
Water Treatment & Desalination: Resistant to chlorinated water and marine environments.
Oil & Gas (Non-critical services): For utility lines, water injection, and low-pressure hydrocarbon services.
Power Generation: Used in various auxiliary piping systems.
Selection & Installation Notes
1. Define Service Conditions:Always select based on the internal pressure, temperature, and chemical composition of the medium being conveyed.
2. Confirm Standard and Rating: Ensure the flange standard (ASME, EN, etc.) and pressure class (e.g., Class 150) match the rest of your piping system. Flanges from different standards are not interchangeable.
3. Request Material Certs: For traceability and quality assurance, always request a **Material Test Certificate (MTC) or Mill Test Certificate** from your supplier.
4. Welding Procedure: Proper welding is critical. The pipe must be inserted until it is flush with the face of the flange. Ensure high-quality internal and external fillet welds to avoid defects that could lead to failure.
5. Pros and Cons:
Pros:Lower cost, easier bolt hole alignment.
Cons: Not recommended for services with severe bending stresses, high cyclic loading (frequent temperature/pressure swings), or highly erosive/corrosive services where the weld joint could be a vulnerability. A Welding Neck flange is typically preferred for these demanding services.
| Material | 304,304L,316,316L,904L,TP321,TP317,S32205,S32507,S31803,S32750,S32760,TP347 TP316T,S310S,TAI2,C276 |
| Specification/Size | DN15-DN4000 |
| Pressure | PN10-PN160; 150LB-2500LB; JIS 5K-JIS 20K |
| Standard | GB,ANSI.JIS,DIN, |
| Sealing Surface | FF,RF,Rtj, Lap Joint, Tongue and Groove, M, F |
| Flange Types | PL,SO,WN,SW,TH,PJ/SE,BL |
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