Looking for high-performance butt-weld neck flanges? As leading China suppliers and a certified factory, we provide tapered neck flanges designed for high-pressure and high-temperature applications to ensure maximum system integrity.
Butt-Weld Neck Flanges, also recognized as weld-neck flanges, are high-performance piping components engineered for critical industrial applications. Featuring a long, tapered hub that is beveled for seamless welding directly to a pipe or vessel, these flanges provide a robust, permanent connection. This specialized design ensures that stress is distributed evenly across a larger area, significantly reducing the risk of failure under extreme conditions.
Designed for maximum reliability, our butt-weld flanges are the ideal choice for high-pressure and high-temperature environments. By creating a smooth transition between the flange and the piping, they minimize turbulence and pressure drops, ensuring optimal flow efficiency. Whether utilized in oil and gas pipelines, chemical processing plants, or power generation systems, these flanges guarantee a leak-proof, high-integrity seal that meets the most stringent global safety standards.
Detailed Parameters
| Pressure Rating (PN) | PN6 - PN40 | Pressure Rating (Class) | Class 150 - Class 2500 |
|---|---|---|---|
| Nominal Diameter (DN) | DN10 - DN2000 | Inch Size | ½" - 24" / S.A 12" - 60" |
| Carbon Steel Mat. | ASTM A105, P235GH, P245GH, P250GH, P265GH, ST37-2 | Stainless Steel Mat. | ASTM A182, 304, 306 |
| Applicable Standards | ASME, EN, JIS, DIN, BS, KS, GOST, SABS, ATK | Surface Coating | Black paint, Galvanize, Grease, Epoxy paint |
| Welding Method | Butt-Weld Connection | Primary Application | High Pressure/Temperature Piping |
Key Advantages
Superior Strength
The tapered neck distributes stress gradually, making it ideal for extreme high-pressure systems.
Long-term Durability
Manufactured from premium carbon and stainless steels for exceptional wear and corrosion resistance.
Leak-Proof Seal
Butt-welding creates a seamless, robust joint that eliminates crevices and prevents leakage.
Optimized Flow
Smooth internal transition minimizes turbulence and pressure drops for efficient fluid transport.
Global Compliance
Strictly conforms to ASME B16.5 and other international standards for total compatibility.
Versatile Coating
Available in epoxy, galvanize, and black paint to suit diverse environmental requirements.
Product Gallery
Management Platforms
Quality Control
Strict adherence to metallurgical standards and dimensional accuracy for every flange.
Precision Forging
Advanced forging processes to ensure structural integrity and uniform density.
Standard Compliance
Certified production lines meeting ASME, DIN, and JIS requirements.
Material Traceability
Full heat-number traceability for all carbon and stainless steel grades used.
Inventory Management
Ready-to-ship stock for common sizes to minimize project lead times.
Custom Engineering
Bespoke sizing and surface treatments tailored to specific industrial needs.
Investment Return Comparison
| Feature | Weld Neck Flange | Slip-On Flange |
|---|---|---|
| Pressure Capacity | Very High | Moderate to Low |
| Joint Integrity | Seamless / Permanent | Double Weld / Mechanical |
| Stress Distribution | Optimized (Tapered) | Concentrated at Weld |
| Installation Speed | Slower (Precision Weld) | Faster (Slide & Weld) |
| Operational Life | Extended (Low Maintenance) | Standard |
Frequently Asked Questions
Weld neck flanges have a tapered hub that is butt-welded to the pipe, providing superior strength for high-pressure systems. Slip-on flanges slide over the pipe and are welded inside and out, making them easier to install but suitable only for lower-pressure applications.
The most common materials include Carbon Steel (such as ASTM A105) for general strength and Stainless Steel (such as ASTM A182/304/316) for applications requiring corrosion resistance.
The taper allows for a gradual transition of stress from the pipe to the flange, which prevents fatigue and failure in systems subject to high thermal expansion or dynamic pressure changes.
They are primarily used in the oil and gas, petrochemical, chemical processing, and power generation industries where system integrity and leak-proof connections are critical.
Our flanges conform to leading international standards including ASME B16.5, EN, JIS, DIN, BS, and GOST, ensuring compatibility across global piping projects.
Yes, we offer various surface treatments including black paint, galvanization, grease, and epoxy paint to protect the flanges from corrosion based on your operating environment.
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