Description
Product Detail
Inconel weld neck flange is a butt-weld type forged flange with a long tapered hub that provides smooth stress transition from flange to pipe. It is selected for severe service conditions involving high temperature, cyclic loading, oxidation, chloride media and corrosive chemical exposure. Common applications include offshore pipelines, heat exchangers, pressure vessels, petrochemical lines, flue gas desulfurization systems and high purity process piping.
SASA FLANGE manufactures and supplies Inconel weld neck flanges in accordance with ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS and GB standards. Customized dimensions and drilling are available. 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 project and end-user quality requirements.
- ✓Product Name: Inconel Weld Neck Flange
- ✓Material Grade: Inconel 600, Inconel 625, Alloy 825 and other nickel alloy forged grades
- ✓Product Type: Forged weld neck flange with butt weld end
- ✓Main Feature: Excellent high temperature strength, corrosion resistance and reliable welding performance
- ✓Applications: Oil and gas, chemical processing, power generation, marine, offshore and water treatment systems
Product Parameters
| Product Name | Inconel Weld Neck Flange |
| Material Grade | ASTM B564 UNS N06600, UNS N06625, UNS N08825 and custom nickel alloy grades |
| Material Type | Nickel alloy forged material |
| Product Form | Forged and machined weld neck flange |
| Size Range | DN15 – DN1500 (1/2 inch – 60 inch) |
| Pressure Class | Class 150 – 2500 / PN10 – PN100 |
| Sealing Face | RF, FF, RTJ, TG, MFM |
| Surface Treatment | Natural machined, pickled, passivated, protective oil on sealing face |
| 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 a reference for common Inconel 625 forged flange material. Actual composition may vary slightly by grade, product form and applicable ASTM specification. Final values shall comply with the relevant standard, approved purchase order requirements and the original mill test certificate supplied with the material.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| UNS N06625 Content % | 0.10 max | 0.50 max | 0.50 max | 0.015 max | 0.015 max | 20.0-23.0 | 58.0 min | 8.0-10.0 | Nb+Ta 3.15-4.15, Fe 5.0 max |
Mechanical Properties
Mechanical properties of Inconel weld neck flanges depend on the selected nickel alloy grade, manufacturing route, heat treatment condition and section thickness. The values below are typical reference figures for forged materials commonly used for flange production. Final certified test results are stated on the material certificate and may differ according to specification and project requirements.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| UNS N06600 | 550 MPa min | 240 MPa min | 30% min | ≤ 195 HB | 8.47 g/cm3 |
| UNS N06625 | 827 MPa min | 414 MPa min | 30% min | ≤ 220 HB | 8.44 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | RF | Inconel 600 / 625 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | Inconel 600 / 625 / Alloy 825 | Stock / Production |
| DN350 – DN600 | Class 150 – 2500 | RF / RTJ | Inconel 625 / custom nickel alloy | Production |
| DN700 – DN1500 | Class 150 – 900 | RF | Inconel 625 / Alloy 825 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| ASME Weld Neck Flange | Long tapered hub flange with butt weld end manufactured to ASME B16.5 or B16.47 | High pressure and high temperature process piping |
| EN Weld Neck Flange Type 11 | European standard welding neck flange to EN 1092-1 with PN rating | Chemical, utility and industrial plant piping |
| Raised Face Inconel WN Flange | Standard raised face design for use with non-metallic or semi-metallic gaskets | General refinery, offshore and process line service |
| RTJ Inconel WN Flange | Ring type joint facing for metal gasket sealing under severe pressure and temperature | Critical oil and gas, subsea and high pressure systems |
Equivalent Standards and International Names
Inconel weld neck flanges can be manufactured to major international flange standards, while the nickel alloy grade is selected according to ASTM or equivalent material specifications. Dimensional standards differ by region, but equivalent products can be produced with matching pressure ratings, facing types and drilling patterns to suit global piping systems and project drawings.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | ASTM B564 UNS N06600 / N06625 weld neck flange |
| Europe | EN 1092-1 | Type 11 nickel alloy flange to project specification |
| Germany | DIN 2633 / 2635 | DIN weld neck flange in Inconel 625 equivalent nickel alloy |
| Japan | JIS B2220 | JIS welding neck flange in UNS N06600 or N06625 |
| China | GB/T 9119 | WN flange in ASTM B564 nickel alloy grade |
Production Process Flow
Manufacturing of Inconel weld neck flanges requires strict control of alloy identity, forging conditions and final machining accuracy. SASA FLANGE applies traceable process control from raw material to shipment to ensure dimensional consistency, material integrity and reliable sealing performance in critical 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 | Solution annealing or specified heat treatment according to alloy grade | 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 verifies that the forged nickel alloy used for the flange conforms to the specified grade such as UNS N06600 or N06625. Raw material certificates are checked and laboratory analysis is performed when required to confirm alloying elements including nickel, chromium, molybdenum and other controlled elements before production release.
2. Mechanical Properties Testing
Mechanical testing is carried out according to the applicable material specification and project requirement. Typical tests include tensile strength, yield strength, elongation and hardness to confirm the forged flange material has adequate strength and ductility for high temperature and pressure service. Results are recorded and linked to the heat number for traceability.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, bore size, hub dimensions, thickness, bolt circle, bolt hole quantity and hole diameter. Sealing face type and finish, including RF height or RTJ groove dimensions, are checked against ASME, EN, DIN, JIS, GB or approved customer drawings to ensure proper fit-up and sealing performance during installation.
4. PMI Testing and Hydrostatic Testing
Positive Material Identification testing is performed to verify the alloy chemistry of each flange or production batch and prevent material mix-up. Hydrostatic or system pressure related testing can be arranged according to project scope. SASA FLANGE provides EN 10204 3.1 certificate, inspection reports and full traceability documents with each qualified shipment.
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
Inconel weld neck flanges are used where standard carbon steel or stainless steel flanges may not provide sufficient resistance to heat, oxidation or aggressive process media. Their combination of mechanical strength, weldability and corrosion resistance makes them suitable for demanding industrial systems that require long-term sealing reliability and material integrity.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Offshore pipelines, sour service lines, high pressure wellhead and process piping | Offers strong welded connection, excellent corrosion resistance and high temperature performance |
| Chemical Processing | Acid handling lines, reactors, heat exchangers and aggressive fluid transfer systems | Resists oxidizing and reducing media better than many conventional alloys |
| Power Generation | Boiler auxiliary systems, FGD units, high temperature steam related service and exhaust systems | Maintains strength and oxidation resistance under elevated temperatures |
| Water Treatment | Desalination, brine handling and specialty chemical dosing lines | Provides good resistance to chloride-containing environments and long service life |
| Marine and Offshore | Seawater piping, topside modules, FPSO process lines and offshore utility systems | Suitable for corrosive marine environments and vibration-prone service conditions |
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 an Inconel weld neck flange?
A: An Inconel weld neck flange is a forged nickel alloy flange with a long tapered neck and butt weld end. It is designed to be welded directly to pipe for improved strength and stress distribution. This flange type is commonly used in high temperature, corrosive and high pressure systems where long service life and leak-tight performance are required.
Q: What materials are available for Inconel weld neck flange?
A: SASA FLANGE can supply Inconel weld neck flanges in ASTM B564 UNS N06600, UNS N06625 and other nickel alloy grades such as Alloy 825 according to application needs. Material selection depends on temperature, pressure and corrosion environment. We can also offer project-based alternatives when customer drawings or end-user specifications define a specific nickel alloy grade.
Q: What pressure class is supported?
A: Inconel weld neck flanges are commonly supplied in ASME Class 150, 300, 600, 900, 1500 and 2500, as well as EN PN10 to PN100 depending on size and standard. Raised face and ring type joint facings are available. The final class selection should match the piping design pressure, temperature rating and code requirement of the project.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can produce custom Inconel weld neck flanges according to customer drawings, special bore dimensions, non-standard drilling, unique sealing faces and project-specific material requirements. We support ASME, EN, DIN, JIS, GB and custom designs for offshore, chemical and power applications, with machining and inspection tailored to the specified tolerances.
Q: What certificate is provided?
A: SASA FLANGE provides EN 10204 3.1 material certificate for Inconel weld neck flanges, together with mill test certificate, heat number traceability and inspection records. PMI testing, dimensional inspection, chemical analysis and mechanical test reports can be included as required. Hydrostatic related inspection or third-party witness service can also be arranged based on project documentation needs.
Contact Us
If you are looking for inconel 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
