Weld Neck Flanges in hard-to-nd metals. Long Weld Neck Flanges have a hub that extends from the Flanges at the surface, which helps in accommodating the pipe more easily. Alloy Steel Long Weld Neck Flange fall under the group of specialty flanges, reinforcement in services at higher temperatures in the oil industry. A Carbon Steel Long Welding Neck Flanges is preferable in the petroleum and chemical industry as they operate under actuating temperature ranges.
| Material Category | Available Grades |
|---|---|
| Stainless Steel Long Weld Neck Flanges | ASTM A182 / A240 F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F347, F347H, F904L. |
| Duplex & Super Duplex Steel Long Weld Neck Flanges | ASTM/ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61. |
| Carbon Steel Long 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 Long Weld Neck Flanges | ASTM A350 LF2, LF3. |
| Alloy Steel Long Weld Neck Flanges | ASTM/ASME A/SA 182 & A387 F1, F5, F9, F11, F12, F22, F91. |
| Copper Alloy Long 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 Long Weld Neck Flanges | ASTM SB564, SB160, SB472, SB162, Nickel 200 (UNS N02200), Nickel 201 (UNS N02201), Monel 400 (UNS N04400), Monel K500 (UNS N05500), Inconel 800 (UNS N08800), Inconel 825 (UNS N08825), Inconel 600 (UNS N06600), Inconel 625 (UNS N06625), Inconel 601 (UNS N06601), Hastelloy C276 (UNS N10276), Alloy 20 (UNS N08020). |
Our Long Weld Neck Flanges are used for pressure vessel nozzles and high-load process joints requiring smooth stress transition. We supply project and replacement requirements with controlled quality, dimensional checks, and material traceability as per ASME / ASTM.
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.
What is the main advantage of a Long Weld Neck Flange (LWN) over a standard Weld Neck Flange?
Long Weld Neck (LWN) Flanges feature an elongated, heavy-wall hub that eliminates the need for an additional pipe extension. They are primarily used as nozzles on pressure vessels, custom tanks, and heat exchangers to provide maximum structural reinforcement under extreme pressure.
Do you manufacture bespoke lengths for standard ASME B16.5 LWN Flanges?
Yes. While standard lengths vary depending on the pressure class, we regularly machine custom heights, including Heavy Barrel and Equal Barrel designs, from forged blanks to match precise engineering drawings.