Description
Product Detail
A socket weld neck flange combines the socket weld connection principle with an extended hub or neck profile to improve stress distribution and pipe alignment in compact, high-pressure service. It is typically used on small-diameter pipelines handling steam, oil, gas, chemicals and other critical media where leak resistance, strength and reliable installation are important. Common face types include RF and RTJ according to pressure class and service conditions.
SASA FLANGE supplies socket weld neck flanges in standard and customized dimensions to ASME, EN, DIN, JIS and GB requirements. Each order can be supported by chemical analysis, mechanical testing, dimensional inspection and PMI testing. EN 10204 3.1 certification, positive material identification, marking verification and full heat number traceability are available to meet project, EPC and end-user quality requirements.
- ✓Product Name: Socket Weld Neck Flange
- ✓Material Grade: Carbon steel, stainless steel, alloy steel and duplex stainless steel
- ✓Product Type: Forged socket weld flange with reinforced neck/hub design
- ✓Main Feature: High strength connection for small-bore, high-pressure and high-temperature piping
- ✓Applications: Oil and gas, petrochemical, power generation, marine, shipbuilding and water treatment
Product Parameters
| Product Name | Socket Weld Neck Flange |
| Material Grade | ASTM A105, A350 LF2, A182 F304/F304L, F316/F316L, F321, F11, F22, F51, F53, F55 |
| Material Type | Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel |
| Product Form | Forged and machined flange |
| Size Range | DN15 – DN100 (1/2 inch – 4 inch) |
| Pressure Class | Class 150 – 2500 / PN10 – PN100 |
| Sealing Face | RF, FF, RTJ |
| Surface Treatment | Anti-rust oil, Black paint, Hot-dip galvanized, Pickling, Passivation |
| Standard | ASME B16.5, EN 1092-1, DIN, JIS B2220, GB/T 9119 or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional Inspection, Visual Inspection, Hydrostatic when specified |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, CNC Machining, Custom Drilling, Custom Size Processing |
Chemical Composition
The following chemical composition is for reference using a common carbon steel forging grade for socket weld neck flanges. Final chemical composition depends on the selected material grade, applicable standard, heat treatment condition and approved mill test certificate. SASA FLANGE supplies materials according to project requirements with full traceability and inspection records.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A105 Content % | 0.35 max | 0.10 – 0.35 | 0.60 – 1.05 | 0.035 max | 0.040 max | 0.30 max | 0.40 max | 0.12 max | Cu 0.40 max, V 0.08 max |
Mechanical Properties
Mechanical properties shown below are representative values for commonly supplied forging grades used in socket weld neck flanges. Actual results may vary by material grade, heat treatment condition, product section and governing standard. Certified test values are confirmed by mill test certificate and supplementary inspection when required by the project specification.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| ASTM A105 | 485 MPa min | 250 MPa min | 22% min | 187 HB max | 7.85 g/cm3 |
| ASTM A182 F316/F316L | 515 MPa min | 205 MPa min | 30% min | 217 HB max | 7.98 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN25 | Class 150 – 600 | RF | A105, F304, F316 | Stock / Production |
| DN32 – DN50 | Class 150 – 1500 | RF / RTJ | A105, F11, F22, F304, F316 | Stock / Production |
| DN65 – DN80 | Class 300 – 2500 | RF / RTJ | A105, F11, F22, F316, F51 | Production |
| DN100 | Class 150 – 900 | RF | A105, F304, F316, F51 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| Socket Weld Neck Flange | Socket weld flange with extended neck or hub to improve alignment and stress transition | High-pressure small-bore process lines and critical utility piping |
| Standard Socket Weld Flange | Conventional socket weld flange with socket bore and compact hub | General high-pressure small-diameter piping systems |
| Weld Neck Flange | Butt weld flange with long tapered hub for full-penetration welding | Larger diameter or severe cyclic service lines |
| Threaded Flange | Internally threaded flange without welding requirement | Low-pressure non-cyclic service or where welding is restricted |
Equivalent Standards and International Names
Socket weld neck flange dimensions and grade naming can vary by regional standard and project specification. In practice, buyers often match pressure rating, facing type, bore details and material requirements rather than relying on one-to-one equivalency only. SASA FLANGE supports international standards and can recommend suitable equivalent grades for export projects.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM A105, A182 F304/F316, F11, F22 |
| Europe | EN 1092-1 | P245GH, 1.4301, 1.4404, 13CrMo4-5 |
| Germany | DIN 2565 / DIN 2566 | C22.8, 1.4301, 1.4404, 13CrMo4-5 |
| Japan | JIS B2220 | SFVC2A, SUS304, SUS316 |
| China | GB/T 9119 | 20#, 16Mn, 304, 316, 12Cr1MoV |
Production Process Flow
Manufacturing quality of socket weld neck flanges depends on strict control of raw material, forging soundness, bore/socket dimensions and sealing face machining. SASA FLANGE applies traceable production and inspection procedures to ensure dimensional accuracy, pressure integrity and compliance with project specifications.
- 1. Raw Material Selection
- 2. Forging / Cutting
- 3. Heat Treatment
- 4. Rough Machining
- 5. Finish Machining
- 6. Drilling
- 7. Surface Treatment
- 8. Inspection
- 9. Marking
- 10. Packing
- 11. Delivery
| Process Step | Description | Quality Control Point |
|---|---|---|
| Raw Material | Select certified forging billets or plates | Material certificate and traceability |
| Forging | Hot forging to achieve required shape | Forging temperature and reduction ratio |
| Heat Treatment | Normalizing, tempering or annealing | Temperature and holding time control |
| Machining | Sealing face, bolt holes, dimensions | Dimensional accuracy and surface finish |
| Inspection | Final inspection before shipment | Dimension, surface, PMI, hydrostatic |
Product Inspection
1. Chemical Composition Inspection
Chemical composition inspection is performed to verify that the flange material matches the ordered grade such as A105, F316 or F22. Spectrometer or laboratory analysis checks key alloying and residual elements against applicable standards. This helps ensure weldability, corrosion resistance and pressure service suitability before machining and final release.
2. Mechanical Properties Testing
Mechanical testing confirms tensile strength, yield strength, elongation and hardness according to the selected material standard. Test specimens are taken from representative heats or forgings after heat treatment. These results verify that the socket weld neck flange has the required strength and toughness for pressure piping, thermal cycling and demanding industrial service.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, flange thickness, bolt circle, hole diameter, hub dimensions, socket bore, socket depth and sealing face finish. Accurate inspection is essential to ensure fit-up with mating flanges and proper insertion of the pipe into the socket. SASA FLANGE checks dimensions in accordance with ASME, EN, DIN, JIS or customer drawings.
4. PMI Testing and Hydrostatic Testing
PMI testing is available to confirm alloy grade for stainless steel, alloy steel and duplex materials using portable analyzers. Hydrostatic testing can be arranged when required by project specification or special design. Final documents may include EN 10204 3.1 certificate, inspection report, heat number traceability, dimensional report and marking verification for shipment approval.
Product Packaging
- ✓Wooden Case Packaging: Suitable for high-pressure and large-diameter products
- ✓Pallet Packing with Shrink Wrap: Suitable for batch shipments and standard sizes
- ✓Anti-rust Oil Coating + Waterproof Paper: Used for ocean freight protection
- ✓Individual Plastic Bag + Carton: Used for small fittings and threaded products
- ✓Clear Marking: Grade, size, pressure class, heat number and PO number
Applications
Socket weld neck flanges are mainly used in small-diameter piping where pressure resistance, compact installation and dependable welded connection are priorities. They are selected for utility and process lines carrying steam, hydrocarbons, chemicals and treated water, especially in systems requiring secure fit-up and stable performance under vibration or temperature fluctuation.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Instrument lines, utility lines, high-pressure sampling systems, gas distribution skids | Provides strong small-bore connection with good alignment and pressure capability |
| Chemical Processing | Corrosive fluid transfer lines, solvent systems, reactor auxiliary piping | Available in stainless and alloy grades for corrosion resistance and leak-tight service |
| Power Generation | Steam tracing, boiler auxiliary piping, condensate and high-temperature service lines | Suitable for high-pressure and elevated-temperature operation in compact pipe sizes |
| Water Treatment | Chemical dosing lines, backwash lines, pressure pumps and skid piping | Offers reliable connection and easy integration into compact treatment equipment |
| Marine and Offshore | Hydraulic systems, fuel lines, cooling systems and module piping | Compact design, strong welded joint and availability in corrosion-resistant materials |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Socket Weld Flange for global industrial projects
- ✓Customized size, pressure class and material grade according to drawings
- ✓Full standard support: ASME, EN, DIN, JIS, GB, GOST and customer specifications
- ✓Material traceability with heat number control and EN 10204 3.1 material certificate
- ✓Chemical analysis, mechanical testing, PMI testing, hydrostatic and dimensional inspection
- ✓Stock availability for standard items, lead time 3-7 days; custom production 15-30 days
- ✓Export-grade packaging for sea, air and land transportation
- ✓15+ years experience supplying 50+ countries worldwide
FAQ
Q: What is a socket weld neck flange?
A: A socket weld neck flange is a forged flange for small-diameter piping in which the pipe is inserted into a socket and then fillet welded around the hub area. The neck or extended hub helps improve alignment and stress distribution. It is commonly used in high-pressure, moderate-temperature systems where compact installation and reliable connection are required.
Q: What materials are available for socket weld neck flanges?
A: SASA FLANGE supplies socket weld neck flanges in carbon steel, low-temperature carbon steel, stainless steel, alloy steel and duplex stainless steel. Common grades include ASTM A105, A350 LF2, A182 F304/F304L, F316/F316L, F11, F22 and F51. Material selection depends on pressure, temperature, corrosion allowance and applicable project specification.
Q: What pressure class is supported?
A: Socket weld neck flanges are generally used in small-bore piping and are commonly supplied in ASME Class 150, 300, 600, 900, 1500 and 2500, depending on size and material. Under EN and other systems, comparable PN ratings can also be supplied. SASA FLANGE can recommend the correct pressure class based on operating conditions and standard requirements.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can manufacture custom socket weld neck flanges according to drawings or project standards, including special bore and socket dimensions, non-standard drilling, special facing finishes, RTJ grooves and NACE or low-temperature material requirements. We also support custom marking, packaging and third-party inspection for EPC, distributor and end-user procurement needs.
Q: What certificate is provided?
A: Standard supply can include EN 10204 3.1 material certificate together with mill test certificate, dimensional inspection records and heat number traceability. For alloy or stainless grades, PMI testing reports are available. Mechanical test reports and hydrostatic or supplementary inspection documents can also be provided when specified in the purchase order or project quality plan.
Contact Us
If you are looking for socket weld neck flange or related custom flange products, please contact SASA FLANGE with your required size, pressure class, material grade, standard, surface treatment, quantity and inspection requirements. Our team will provide professional technical solutions and competitive quotation within 24 hours.
- 📧 Email: sales@sasaflange.com
- 📱 WhatsApp: +86 13764965049
- ☎️ Tel: +86 21 52236361
- 🌐 Website: www.sasaflange.com
