Weld Neck Flange is flanges that designed to be joined to a piping system by butt welding. This kind of flange include lots of specification. Weld Neck Flange is expensive because of its long neck and cost of people for contact WN flange with pipeline or fitting but is preferred for high-stress applications. The necks, or hubs, transmits stresses to the pipeline. The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the Weld Neck Flange. The bore of Weld-Neck flange matches bore of the pipeline, reducing turbulence and erosion.
Weld Neck Flange is flanges that designed to be joined to a piping system by butt welding. This kind offlange include lots of specification, Weld neck Flange is expensive because of its long neck and cost of people for contact WN flange with pipeline or fitting but is preferred for high stress applications. The necks, or hubs, transmits stresses to the pipeline.
The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the Weld Neck flange. The bore of Weld-Neck flange matches bore of the pipeline, reducing turbulen.
| Material Category | Available Grades |
|---|---|
| Stainless Steel Weld Neck Flanges | ASTM A182 / A240 F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F347, F347H, F904L. |
| Duplex & Super Duplex Steel Weld Neck Flanges | ASTM/ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61. |
| Carbon Steel Weld Neck Flanges | ASTM/ASME A/SA 105, ASTM/ASME A350, ASTM A181 LF2, ASTM A516 Gr.70, ASTM A36, ASTM A694 F42, F46, F52, F60, F65, F70. |
| Low Temperature Carbon Steel Weld Neck Flanges | ASTM A350 LF2, LF3. |
| Alloy Steel Weld Neck Flanges | ASTM/ASME A/SA 182 & A387 F1, F5, F9, F11, F12, F22, F91. |
| Copper Alloy Weld Neck Flanges | ASTM SB61, SB62, SB151, SB152, UNS C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30), C10100, C10200, C10300, C10800, C12000, C12200. |
| Nickel Alloy Weld Neck Flanges | ASTM SB564, SB160, SB472, SB162, Nickel 200 (N02200), Nickel 201 (N02201), Monel 400 (N04400), Monel K500 (N05500), Inconel 800 (N08800), Inconel 825 (N08825), Inconel 600 (N06600), Inconel 625 (N06625), Inconel 601 (N06601), Hastelloy C276 (N10276), Alloy 20 (N08020). |
Our Weld Neck Flanges are used for high-pressure and cyclic service conditions needing strong butt-welded flange joints. We supply project and replacement requirements with controlled quality, dimensional checks, and material traceability as per ASME B16.5 / ASTM A182.
Industries Served: oil & gas, petrochemical, power, EPC, shipbuilding, water treatment, process manufacturing, and heavy engineering.
Supply Regions: India, GCC/Gulf countries, and global export destinations with commercial support for manufacturer, supplier, stockist, and exporter requirements.
Explore More: Flanges | Forged Fittings | Buttweld Fittings | Olets
Certified stainless steel billets are selected according to ASTM, ASME, and EN standards.
Billets are heated and forged into the required flange shape for maximum strength.
Precision machining creates the bore, facing, bolt holes, and required dimensions.
Stress relieving and solution annealing are performed whenever required.
PMI, dimensional inspection, hydrostatic testing, and NDT ensure product quality.
Flanges are cleaned, pickled, passivated, and finished as per customer requirements.
Each flange receives grade, size, heat number, and standard identification markings.
Products are packed securely with flange protectors, wooden pallets, and export-ready crates.
Why choose a Weld Neck Flange over a Slip-On Flange?
Weld Neck flanges are designed with a long tapered hub that transfers stress to the pipe, reducing stress concentration at the base of the flange. This makes them ideal for high-pressure, severe, and cyclic applications where Slip-On flanges might fail or leak. They also allow for better radiography inspection of the weld.
Why are Weld Neck Flanges preferred for high-stress applications?
Weld Neck Flanges feature a long tapered hub that is butt-welded directly to the pipe. This transfers structural stress from the flange base to the pipe itself, preventing stress concentration. It is the absolute highest-integrity connection for extreme temperature fluctuations and high-pressure lines.
How do I specify the bore size for a Weld Neck Flange order?
Because Weld Neck Flanges must match the inner diameter of your existing pipe to ensure uninterrupted fluid flow, you must specify the pipe's schedule (e.g., Schedule 40, Schedule 80) or exact bore dimension when requesting a quote.