Description
Product Detail
A raised face weld neck flange is a forged flange with a long tapered hub and a raised sealing face, designed to be butt welded to pipe for superior strength and reduced stress concentration. The raised face improves gasket seating pressure, while the weld neck design provides excellent performance in high-pressure, high-temperature and severe service conditions. It is widely used in refinery units, process piping, steam lines, offshore systems and critical utility networks.
SASA FLANGE supplies raised face weld neck flanges in standard and customized dimensions according to ASME, EN, DIN, JIS and GB requirements. Each order can be supported by chemical analysis, mechanical testing, dimensional inspection, PMI testing, EN 10204 3.1 certificate and full heat number traceability to meet international project and end-user specifications.
- ✓Product Name: Raised Face Weld Neck Flange
- ✓Material Grade: ASTM A105N, A350 LF2, A182 F304/F316, F11/F22, F51
- ✓Product Type: Forged butt-weld flange with raised face sealing surface
- ✓Main Feature: High strength hub design for pressure, temperature and cyclic loading service
- ✓Applications: Oil and gas, petrochemical, power generation, marine, water treatment and process piping
Product Parameters
| Product Name | Raised Face Weld Neck Flange |
| Material Grade | ASTM A105N, A350 LF2, A182 F304/F304L, F316/F316L, F321, F11, F22, F51, F53 |
| Material Type | Carbon Steel, Low Temperature Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel |
| Product Form | Forged flange, machined raised face, butt-weld neck |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN6 – PN100 |
| Sealing Face | RF, FF, RTJ, TG, MFM |
| Surface Treatment | Anti-rust oil, Black paint, Yellow transparent varnish, Hot-dip galvanized, Passivation |
| 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 chemical composition below is for reference based on a common forged carbon steel grade used for raised face weld neck flanges. Final chemistry depends on the selected material grade, applicable manufacturing standard and the issued mill test certificate. Stainless steel, alloy steel and duplex grades will have different composition limits according to their respective ASTM or EN standards.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A105N % | 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 raised face weld neck flanges vary according to the selected material grade, forging practice, heat treatment condition and section thickness. The values below are typical minimum requirements for widely used flange materials and are provided for general technical reference. Project specifications, code requirements and MTC data should be checked for final purchasing confirmation.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| ASTM A105N | 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 | A105N, F304/L, F316/L | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | A105N, LF2, F304/L, F316/L, F11, F22 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | RF / RTJ | A105N, LF2, F11, F22, F51 | Production |
| DN700 – DN1500 | Class 150 – 900 | RF | A105N, F304/L, F316/L | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| Raised Face Weld Neck | Butt-weld flange with tapered hub and raised gasket seating surface | General high-pressure and process piping systems |
| Flat Face Weld Neck | Weld neck flange with full flat sealing surface for full-face gasket contact | Low-pressure cast iron valves or flat face equipment connections |
| RTJ Weld Neck | Weld neck flange with ring type joint groove for metal ring gasket sealing | High-pressure, high-temperature and critical hydrocarbon service |
| Long Weld Neck | Extended neck design used as nozzle flange or vessel connection | Pressure vessels, columns and special engineered equipment |
Equivalent Standards and International Names
Raised face weld neck flanges are produced under several international dimensional systems. While flange dimensions, drilling and pressure ratings differ by region, equivalent product forms are available across USA, Europe, Germany, Japan and China. Material names may also vary, so project buyers should confirm both flange standard and forging grade equivalence during technical review and quotation.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM A105N, A182 F304/F316, A350 LF2 |
| Europe | EN 1092-1 | P250GH, 1.4301, 1.4404, 13CrMo4-5 |
| Germany | DIN 2633 / 2635 / 2637 | C22.8, 1.4301, 1.4404, 16Mo3 |
| Japan | JIS B2220 | SFVC2A, SUS304, SUS316 |
| China | GB/T 9119 | 20#, 16Mn, 304, 316, 12Cr1MoV |
Production Process Flow
Manufacturing quality of raised face weld neck flanges depends on strict control from raw material selection through forging, machining and final inspection. SASA FLANGE applies process monitoring and traceability at each stage to ensure dimensional accuracy, correct material grade and reliable sealing performance.
- 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 analysis is performed to verify that the forging material conforms to the required grade such as A105N, LF2, F304 or F316. Test results are checked against applicable ASTM or EN limits for carbon, manganese, sulfur, phosphorus and alloying elements. This confirms material suitability before machining and shipment and supports full traceability documentation.
2. Mechanical Properties Testing
Mechanical testing confirms that the flange material achieves the specified tensile strength, yield strength, elongation and hardness after forging and heat treatment. Typical tests are carried out in accordance with relevant material standards and project requirements. These results help ensure the raised face weld neck flange can perform safely in pressure and temperature service.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, bore, hub dimensions, flange thickness, bolt circle, bolt hole size, hole quantity and raised face geometry. Surface finish of the gasket seating area is also checked to meet the required serration or machining standard. Accurate dimensional control is essential for fit-up, leak tightness and field installation efficiency.
4. PMI Testing and Hydrostatic Testing
PMI testing is available to verify alloy identity and prevent material mix-up, especially for stainless steel, alloy steel and duplex grades. Hydrostatic or pressure-related verification can be arranged according to project scope and mating assembly requirements. SASA FLANGE also provides EN 10204 3.1 certificate, inspection records and heat number traceability for export and project 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
Raised face weld neck flanges are widely selected for piping systems that require strong butt-welded joints, controlled gasket seating stress and dependable sealing under pressure and temperature changes. Their tapered hub reduces stress concentration and improves service life, making them suitable for demanding industrial environments across energy, process and utility sectors.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Pipeline terminals, refineries, gas compression skids, drilling and production lines | Provides high joint strength, good fatigue resistance and reliable sealing in pressure service |
| Chemical Processing | Acid lines, solvent systems, reactor piping, process transfer lines | Available in stainless and alloy grades for corrosion resistance and process safety |
| Power Generation | Steam lines, boiler feed systems, condensate and high-temperature utility piping | Weld neck design performs well under thermal cycling and elevated pressure |
| Water Treatment | Pumping stations, desalination units, filtration skids and utility piping | Offers durable flange connection with easy maintenance and gasketed sealing |
| Marine and Offshore | Seawater systems, topside piping, ballast lines and offshore modules | Suitable for harsh environments with strong mechanical integrity and optional corrosion-resistant grades |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Weld Neck 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 raised face weld neck flange?
A: A raised face weld neck flange is a forged flange with a tapered hub that is butt welded directly to pipe and a slightly elevated gasket seating area. The raised face concentrates gasket load for better sealing, while the neck improves stress distribution. It is commonly used in high-pressure, high-temperature and critical service piping systems.
Q: What materials are available for raised face weld neck flanges?
A: SASA FLANGE can supply raised face weld neck flanges in carbon steel, low-temperature carbon steel, stainless steel, alloy steel and duplex stainless steel. Common grades include ASTM A105N, A350 LF2, A182 F304/F304L, F316/F316L, F11, F22, F51 and F53. Other grades can be produced according to customer drawings and project specifications.
Q: What pressure class is supported?
A: Raised face weld neck flanges are available in ASME Class 150, 300, 400, 600, 900, 1500 and 2500, with comparable PN ratings under EN and DIN systems such as PN6 to PN100 depending on size and standard. The final pressure rating depends on the selected dimensional standard, material grade, design temperature and end-user specification.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can produce non-standard and project-specific raised face weld neck flanges based on drawings or technical datasheets. Custom services include special bore sizes, non-standard drilling, alternative facing types such as RF or RTJ, special materials, extra machining requirements and marked traceability to match valves, equipment or skid package connections.
Q: What certificate is provided?
A: SASA FLANGE provides EN 10204 3.1 material certificate for raised face weld neck flanges, together with mill test certificate data and inspection reports as required. Available documentation can include chemical analysis, mechanical properties, dimensional inspection records, PMI testing results and heat number traceability. Additional third-party inspection support can also be arranged for project orders.
Contact Us
If you are looking for raised face weld neck 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
