Description
Product Detail
Slip on weld neck flange is a forged flange designed with a bore slightly larger than the pipe outside diameter, allowing the pipe to slip into the flange before fillet welding. With its extended neck or hub section, this design improves pipe alignment, adds rigidity at the connection point and is suitable for low to medium pressure service where easier installation and cost efficiency are important. It is commonly used in process piping, utility lines, water systems, marine pipelines and general industrial service.
SASA FLANGE supplies slip on weld neck flange products in standard and custom dimensions according to ASME, EN, DIN, JIS and GB standards. Each order can be supported by chemical analysis, mechanical testing, dimensional inspection, PMI testing, sealing face verification, EN 10204 3.1 certificate and full heat number traceability to meet project, EPC and end-user quality requirements.
- ✓Product Name: Slip On Weld Neck Flange
- ✓Material Grade: ASTM A105, A182 F304/F316, A350 LF2, F11, F22, F51
- ✓Product Type: Forged slip-on flange with reinforced neck or hub design
- ✓Main Feature: Easy pipe installation, accurate alignment, good rigidity and economical fabrication
- ✓Applications: Oil and gas, chemical, power generation, marine, water treatment and general industrial piping
Product Parameters
| Product Name | Slip On Weld Neck Flange |
| Material Grade | ASTM A105, A350 LF2, A182 F304/F304L/F316/F316L, F11, F22, F51, F53, F55 |
| Material Type | Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel |
| Product Form | Forged flange, machined flange, custom drilled flange |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN6 – PN100 / JIS 5K – 40K |
| Sealing Face | RF, FF, RTJ, TG, MFM |
| Surface Treatment | Anti-rust oil, black paint, yellow paint, hot-dip galvanized, passivation, CNC machined finish |
| Standard | ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS B2220, GB/T 9119 or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional, Hydrostatic |
| 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 general reference based on a common carbon steel forged grade used for slip on weld neck flange production. Final chemical composition depends on the specified material grade, heat treatment condition and applicable standard, and will be confirmed by the mill test certificate and inspection records supplied with the order.
| 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 of slip on weld neck flange materials vary according to grade, forging practice, heat treatment condition and section thickness. The values below represent typical minimum requirements for widely specified flange materials. Actual test results are reported in the EN 10204 3.1 material certificate and can be verified through third-party inspection when required.
| 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 – DN50 | Class 150 – 600 | RF | A105, F304/L, F316/L | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | A105, LF2, F304/L, F316/L, F11, F22 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | RF / RTJ | A105, LF2, F316/L, F51 | Production |
| DN700 – DN1500 | Class 150 – 900 | RF | A105, F304/L, F316/L | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| ASME Slip-On | Standard slip-on flange with bore larger than pipe OD, welded by fillet weld | General process piping and utility service |
| Slip On Weld Neck Flange | Slip-on style flange with reinforced neck or hub for improved alignment and rigidity | Industrial systems needing easier fit-up with added hub strength |
| Raised Face Type | Sealing face with raised gasket seating area for improved pressure sealing | Oil, gas, chemical and power piping |
| Ring Type Joint Type | Machined RTJ groove for metal ring gasket sealing under higher pressure service | High-pressure hydrocarbon and critical service lines |
Equivalent Standards and International Names
Slip on weld neck flange products can be produced to multiple international flange systems depending on project region and pipeline specification. Material grade names and dimensional series differ by standard, but equivalent carbon steel, stainless steel and alloy steel options are available for global EPC, OEM and maintenance requirements with corresponding test certificates.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM A105, A182 F304/F316, A350 LF2 |
| Europe | EN 1092-1 | P245GH, 1.4301, 1.4401, 1.4404 |
| Germany | DIN 2527 / 2566 | C22.8, 1.0460, 1.4571 |
| Japan | JIS B2220 | SFVC2A, SUS304, SUS316 |
| China | GB/T 9119 | 20#, 16Mn, 06Cr19Ni10, 022Cr17Ni12Mo2 |
Production Process Flow
SASA FLANGE controls each manufacturing stage of slip on weld neck flange production to ensure reliable dimensional accuracy, material integrity and compliance with international flange standards for industrial piping service.
- 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 carried out using spectrometer or laboratory analysis to verify that the flange material conforms to the specified grade such as A105, F304, F316 or alloy steel grades. Key elements including carbon, manganese, chromium, nickel and molybdenum are checked against the applicable ASTM, EN, DIN or project specification requirements.
2. Mechanical Properties Testing
Mechanical testing confirms that forged flanges meet required tensile strength, yield strength, elongation and hardness values. Tests are performed according to relevant material standards and heat treatment condition. This inspection ensures the slip on weld neck flange has the required strength and toughness for service pressure, fabrication and operating temperature conditions.
3. Dimensional Inspection
Dimensional inspection verifies outside diameter, thickness, bore size, hub dimensions, bolt circle, bolt hole diameter, number of holes and flange facing details. Raised face height, RTJ groove dimensions and flatness are also checked where applicable. This ensures full interchangeability with standard piping systems and proper gasket sealing during field installation.
4. PMI Testing and Hydrostatic Testing
PMI testing is available to confirm alloy identity and prevent material mix-up, especially for stainless steel, duplex and chrome moly grades. Hydrostatic or pressure-related verification can be arranged according to project requirements. All inspection records can be linked to the heat number and supplied with EN 10204 3.1 certificate, marking and full traceability documentation.
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
Slip on weld neck flange is used across industrial piping systems where reliable connection strength, simple assembly and standard dimensional compatibility are required. Its slip-on installation style supports efficient fabrication, while the reinforced hub profile provides improved alignment and stress distribution in general process, utility and medium-pressure service applications.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Process lines, produced water systems, utility piping, tank farm connections | Provides economical installation, standard sealing faces and dependable service in low to medium pressure lines |
| Chemical Processing | Corrosive fluid transfer lines, pump connections, storage and dosing systems | Available in stainless steel and alloy grades with good corrosion resistance and easy field assembly |
| Power Generation | Cooling water lines, auxiliary steam systems, condensate and service piping | Supports standard plant piping layouts with good alignment and fabrication efficiency |
| Water Treatment | Raw water, filtered water, chemical dosing and distribution pipelines | Cost-effective flange connection for carbon steel or stainless systems with easy maintenance access |
| Marine and Offshore | Ballast lines, seawater systems, fire lines and deck utility piping | Suitable in corrosion-resistant materials and practical for confined fabrication and replacement work |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Slip-On Flanges 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 slip on weld neck flange?
A: A slip on weld neck flange is a flange designed with a bore slightly larger than the pipe outside diameter so the pipe can slip into position before welding. Compared with a standard slip-on flange, the reinforced neck or hub offers better alignment and added rigidity, making it suitable for general industrial piping and medium-duty service conditions.
Q: What materials are available for slip on weld neck flange?
A: SASA FLANGE supplies slip on weld neck flange products 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. Other grades can be produced according to international standards or customer project specifications.
Q: What pressure class is supported?
A: The supported pressure range typically covers ASME Class 150, 300, 600, 900, 1500 and 2500, depending on size, material and design requirements. EN and DIN pressure ratings such as PN6 to PN100 and JIS ratings from 5K to 40K are also available. Final selection depends on operating pressure, temperature and piping code requirements.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can supply custom sizes, non-standard drilling, special bore dimensions, customized neck geometry, RTJ or raised face machining and special material grades based on drawings or project data sheets. We also support ASME, EN, DIN, JIS, GB and mixed-standard requirements for OEM production, maintenance replacement and EPC project procurement.
Q: What certificate is provided?
A: Standard supply includes EN 10204 3.1 material certificate with heat number traceability. Depending on the project, we can also provide MTC, dimensional inspection reports, PMI test records, mechanical test reports and third-party inspection support. Hydrostatic or additional NDE-related documentation can be arranged according to the purchase order and applicable project specification.
Contact Us
If you are looking for slip on 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
