Welding Neck Flange（WN）
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Weld Neck Flange (WN) is a high-pressure flange with a long neck and smooth transition between the flange and the pipe, widely used in high-pressure, high-temperature and high-vibration pipeline systems. It is connected to the pipe by butt welding, which can effectively reduce stress concentration, improve the bearing capacity of the flange, and ensure the tightness and stability of the pipeline connection. As a core flange type in the global industrial field, it perfectly meets the requirements of international trade and high-end project applications.Core AdvantagesExcellent Pressure & Temperature Resistance: The long neck design and butt welding structure make it suitable for high-pressure (up to Class 2500/PN100) and high-temperature working conditions, with strong load-bearing capacity.Low Stress Concentration: The smooth transition between the neck and the pipe avoids local stress accumulation, reducing the risk of leakage and damage in harsh environments.Good Sealing Performance: Adopts precision machining technology, with high flatness of the sealing surface, ensuring reliable sealing even under high pressure and frequent vibration.Wide Compatibility: Suitable for various pipeline media, including corrosive, flammable and explosive fluids, widely used in high-end industrial fields.Global Standard Compliance: Strictly manufactured in accordance with international and national standards, fully adapting to global market requirements.Key SpecificationsStandards: International Standard (ISO 7005), American Standard (ASME B16.5, API 605), German Standard (DIN 2501), European Standard (EN 1092-1), Japanese Standard (JIS B2220), Chinese Standard (GB/T 9115, HG/T 20592, HG/T 20615)Materials: Carbon steel (A105, 20#, Q235B), alloy steel (16Mn, F11, F22, 15CrMo), stainless steel (304, 316L, 321, 2205), special alloys (Monel, Hastelloy, Titanium) — customizable according to medium and working conditions.Pressure Ratings: Class 150, 300, 600, 900, 1500, 2500; PN10, PN16, PN25, PN40, PN63, PN100Nominal Diameter: DN15 ~ DN2000 (NPS 1/2" ~ 80")Sealing Surface Types: RF (Raised Face), RTJ (Ring Type Joint), FF (Flat Face), MFM (Male-Female Face)Working Temperature: -40℃ ~ 600℃ (customizable for high-temperature special requirements)ApplicationsWidely applied in petroleum, petrochemical, natural gas, power generation, nuclear energy, chemical engineering and other high-end industries. It is an ideal flange connection solution for high-pressure, high-temperature, high-vibration and corrosive pipeline systems, and is exported to countries and regions around the world, winning unanimous recognition from global customers.As a professional manufacturer based in Cangzhou Pipeline Equipment Manufacturing Base, Hebei, China, we provide customized services for Weld Neck Flanges according to customer drawings, specifications, materials and standards, and offer one-stop supply and after-sales support to meet the personalized needs of global projects.
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Main products: WN, SO, PL, BL flanges, elbows, tees, reducers, caps. Materials: carbon steel, stainless steel, alloy steel. Standards: ASME, ANSI, EN, JIS, DIN. Export to global pipeline projects. Contact Us