Description
Product Detail
A raised face weld neck flange is a butt-weld flange manufactured with a long tapered hub that provides smooth stress transition from flange to pipe. The raised face sealing surface concentrates gasket load for reliable sealing, making this flange suitable for high-pressure, cyclic, high-temperature and critical service pipelines in refineries, petrochemical plants, power stations, offshore platforms and process piping systems.
SASA FLANGE supplies raised face weld neck flanges in standard and custom dimensions according to ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS and GB standards. Our supply scope includes chemical analysis, mechanical testing, dimensional inspection, PMI testing, sealing face inspection, EN 10204 3.1 certificate and full heat number traceability to meet international project and end-user requirements.
- ✓Product Name: Raised Face Weld Neck Flange
- ✓Material Grade: ASTM A105, A182 F304/F316, F11/F22, A350 LF2, duplex and nickel alloys
- ✓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, chemical processing, power generation, water treatment, marine and offshore piping
Product Parameters
| Product Name | Raised Face Weld Neck Flange |
| Material Grade | ASTM A105, A350 LF2, A694 F52/F60/F65, A182 F304/F304L/F316/F316L/F321/F347/F11/F22/F5/F9/F51/F53, Monel 400, Inconel 625, Hastelloy C276 |
| Material Type | Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel, Nickel Alloy |
| Product Form | Forged flange, machined raised face, butt-weld end |
| 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, Pickling and passivation |
| Standard | ASME B16.5, ASME B16.47 Series A/B, 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 reference based on a common carbon steel grade used for raised face weld neck flanges. Final chemistry depends on the specified material grade, product standard and mill test certificate. SASA FLANGE supplies materials strictly in accordance with applicable ASTM, ASME or customer requirements, with full traceability to the heat number and certified MTC.
| 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 typical reference values for common flange materials. Actual properties may vary according to grade, heat treatment condition, section thickness and applicable standard requirements. Certified tensile, yield, elongation and hardness data can be provided against each heat number, supported by EN 10204 3.1 certification and project-specific inspection documentation 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, F11, F22, F304/L, F316/L | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | RF / RTJ | A105, A694 F52/F60, F11, F22, stainless steel | Production |
| DN700 – DN1500 | Class 150 – 900 | RF | Carbon steel, stainless steel, alloy steel | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| Raised Face Weld Neck Flange | Butt-weld flange with tapered hub and raised sealing face for concentrated gasket loading | High-pressure, high-temperature and critical process piping |
| Flat Face Weld Neck Flange | Butt-weld flange with flat sealing surface for use with flat face gaskets and matching flat flanges | Low-pressure water lines and cast iron equipment connections |
| RTJ Weld Neck Flange | Weld neck flange with ring type joint groove for metal ring gasket sealing | High-pressure refinery, offshore and hazardous fluid service |
| Long Weld Neck Flange | Extended hub flange designed to act as nozzle or barrel extension | Pressure vessels, columns, tanks and specialized process equipment |
Equivalent Standards and International Names
Raised face weld neck flanges are produced under several international standards with differences in dimension series, pressure designation and material naming. Equivalent grades should always be confirmed against project specification, temperature rating and corrosion requirements. SASA FLANGE can assist buyers in cross-referencing ASME, EN, DIN, JIS and GB requirements for export projects and mixed-standard piping systems.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM A105, A350 LF2, A182 F304/F316, F11/F22 |
| Europe | EN 1092-1 | P245GH, P250GH, 1.4301, 1.4307, 1.4401, 1.4404, 13CrMo4-5 |
| Germany | DIN 2633 / 2635 / 2637 / 2638 | C22.8, P250GH, 1.4571, 1.4404 |
| Japan | JIS B2220 | SFVC2A, SUS304, SUS316, SF440A |
| China | GB/T 9119 | 20#, Q235B, 16Mn, 304, 316, 12Cr1MoV |
Production Process Flow
SASA FLANGE controls each manufacturing stage from raw material selection to final packing to ensure dimensional accuracy, sealing integrity and full traceability for raised face weld neck flanges used in demanding industrial 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 analysis is carried out to verify that the flange material conforms to the specified ASTM, EN or project grade. Raw material certificates are checked against heat numbers, and positive elemental values such as carbon, manganese, chromium, nickel and molybdenum are reviewed to confirm compliance before machining and final release.
2. Mechanical Properties Testing
Mechanical testing is performed according to the relevant material standard to confirm tensile strength, yield strength, elongation and hardness. Where required, impact testing for low-temperature grades such as ASTM A350 LF2 can also be arranged. These tests ensure the flange has the required strength and toughness for intended operating conditions.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, thickness, hub dimensions, bore size, bolt circle, bolt hole diameter, number of holes and raised face geometry. Serration finish and sealing face condition are also checked. This process ensures proper fit-up with mating flanges, gaskets and piping components in accordance with the relevant standard.
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 as project specified. SASA FLANGE supplies EN 10204 3.1 certificate, inspection records and traceable marking linked to the original heat number and purchase order.
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 used in industrial piping systems where strength, sealing performance and long-term reliability are critical. Their tapered hub design reduces stress concentration at the weld joint, while the raised face improves gasket compression. This makes them a preferred choice for severe operating conditions across process, utility and energy sectors worldwide.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Transmission lines, refinery piping, compressor stations, offshore process modules | Provides high joint strength and reliable sealing under pressure, vibration and temperature fluctuation |
| Chemical Processing | Acid lines, solvent systems, reactor connections, process utility piping | Available in corrosion-resistant stainless, alloy and nickel grades for aggressive media |
| Power Generation | Steam lines, boiler feed systems, turbine auxiliaries, high-temperature process piping | Weld neck design handles thermal cycling and high-temperature stress effectively |
| Water Treatment | High-pressure pump lines, desalination units, filtration skids, chemical dosing systems | Offers secure gasket sealing and broad material options for treated and corrosive water service |
| Marine and Offshore | Ballast systems, seawater cooling lines, platform utility piping, topside process piping | Suitable for corrosive environments and dynamic service when supplied in stainless or duplex grades |
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 raised face weld neck flange?
A: A raised face weld neck flange is a forged flange with a long tapered hub and butt-weld end. The raised face sealing area compresses the gasket within a smaller contact zone to improve sealing efficiency. It is commonly used on high-pressure and high-temperature pipelines where stress distribution, strength and leak-tight performance are important.
Q: What materials are available for raised face weld neck flanges?
A: SASA FLANGE supplies raised face weld neck flanges in carbon steel, low-temperature carbon steel, stainless steel, alloy steel, duplex stainless steel and nickel alloys. Common grades include ASTM A105, A350 LF2, A182 F304/F316, F11, F22, F51 and Inconel 625. Material selection depends on pressure, temperature, corrosion and project specification.
Q: What pressure class is supported?
A: Standard pressure ratings typically include ASME Class 150, 300, 600, 900, 1500 and 2500, depending on flange size and standard. EN and DIN pressure series such as PN6, PN10, PN16, PN25, PN40, PN64 and PN100 are also available. SASA FLANGE can recommend suitable ratings based on service conditions and design code.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can supply custom bore sizes, non-standard drilling, special facing finish, special hub dimensions and project-specific materials according to drawings or technical specifications. We support machining for RF, RTJ and other facing types, and can produce flanges to ASME, EN, DIN, JIS, GB or mixed project requirements.
Q: What certificate is provided?
A: Raised face weld neck flanges can be supplied with EN 10204 3.1 material certificate, mill test certificate, dimensional inspection report and PMI test records. Mechanical testing, hardness testing and additional third-party inspection can also be arranged. Where required by the order, pressure-related test documentation and full heat number traceability are included with shipment.
Contact Us
If you are looking for raised face 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
