Weld Neck Flange
Product Introduction
The Weld Neck Flange is a forged flange featuring a long, tapered neck that connects to piping via butt-welding. These flanges are typically manufactured from high-quality forgings through processes such as forging, heat treatment, and CNC machining. They comply with international standards-including ASME, EN, DIN, and JIS-and are widely used in sectors such as oil and gas, petrochemicals, power generation, shipbuilding, offshore engineering, and industrial fluid transport systems.
Product Features
Excellent Pressure-Bearing Performance
The long tapered hub design effectively distributes welding stresses, making it suitable for high-pressure, high-temperature, and cyclic loading conditions.
Precision Machining
Sealing surfaces, bevels, and bolt holes are machined using CNC equipment to ensure precise fit and assembly accuracy.
Diverse Sealing Surface Options
Supports various sealing configurations-such as RF, FF, RTJ, TG, and MFM-to meet specific sealing requirements across different operating conditions.
Wide Range of Materials
Available in carbon steel, stainless steel, duplex steel, and alloy steel to suit diverse media and environmental conditions.
Technical Specifications
|
Product Name |
Weld Neck Flange |
|
Standards |
ASME B16.5, ASME B16.47, EN1092-1, DIN, JIS |
|
Size Range |
1/2"–80" (DN15–DN2000) |
|
Pressure Rating |
Class 150–Class 2500 |
|
Sealing Face |
RF, FF, RTJ, TG, MFM |
|
Materials |
ASTM A105, A350 LF2, A182 F304/F316/F321/F51/F53/F91, etc. |
|
Manufacturing Method |
Die forging, open-die forging |
|
Heat Treatment |
Normalizing, annealing, solution treatment, quenching and tempering |
|
Testing Methods |
PMI, UT, PT, MT, hardness testing |
|
Documentation |
EN10204 3.1, MTC, dimensional report, NDT report |
Manufacturing Process
Raw Material Procurement
Raw materials-such as steel ingots, round bars, or forgings-are selected to meet standards like ASTM and EN; original heat numbers are retained to ensure full traceability.
Forging and Forming
Flange blanks are produced using open-die or closed-die forging processes to enhance material density and mechanical properties while minimizing the risk of internal defects.
Heat Treatment
Processes such as normalizing, annealing, solution treatment, or quenching and tempering are applied based on material grade requirements to optimize the microstructure and ensure consistent mechanical properties.
Precision Machining
CNC lathes, machining centers, and drilling equipment are used to machine bores, bevels, sealing faces, and bolt holes, ensuring dimensions comply with international standards.
Inspection and Testing
Dimensional checks, chemical composition analysis, mechanical property testing, and NDT methods (PMI, UT, PT, MT) are performed during production to ensure the product meets project technical specifications.
Protective Packaging
Product surfaces can be treated with anti-rust oil, black paint, or galvanizing; packaging options include waterproof wrapping, plywood crates, or fumigation-free pallets, suitable for sea transport and long-term storage.
Packaging and Shipping
Various packaging options are available based on the shipping method and customer requirements:
- Wooden pallets
- Fumigation-free plywood crates
- Plastic protective caps for sealing surfaces
- Anti-rust oil treatment
- Moisture-proof film wrapping
- Customer-specified shipping marks and label printing
Suitable for Full Container Load (FCL) and Less than Container Load (LCL) ocean shipping, as well as long-term warehouse storage.
Why Choose Us
Specialized in Industrial Flange Manufacturing
We have a long history of serving flange wholesalers, engineering contractors, and industrial equipment manufacturers, and are well-versed in international project procurement processes and technical specifications.
Comprehensive In-House Production System
Forging, heat treatment, CNC machining, testing, and packaging are all performed in-house, ensuring product consistency and greater control over the production process.
Robust Quality Traceability
Raw materials, production batches, and inspection records are fully traceable; we provide complete quality documentation upon request to facilitate project acceptance.
Flexible Supply Support
We accommodate sample prototyping, mixed-batch purchasing, long-term framework orders, and project delivery schedules, helping clients reduce inventory pressure and procurement risks.
FAQ
Q: What is the difference between a Weld Neck Flange and a Slip-On Flange?
A: Weld Neck Flanges utilize a butt-weld connection, offering superior pressure-bearing capacity and fatigue resistance, making them more suitable for high-temperature and high-pressure applications.
Q: Can you provide EN10204 3.1 certificates?
A: Yes, EN10204 3.1 material certificates and relevant test reports can be provided upon request.
Q: Do you support customization for non-standard sizes?
A: Yes, we offer custom manufacturing based on customer drawings, samples, or project specifications.
Q: What is the typical lead time?
A: Samples usually take 2–3 weeks; lead times for bulk orders are determined based on specifications and quantities.
Q: Do you accept third-party inspections?
A: Yes, we accommodate pre-shipment inspections by third-party agencies such as SGS, BV, and TÜV.
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