WN Neck Butt Weld Flange

Stainless Steel Butt Welding Flange (also known as a Weld Neck Flange, WN Flange) is a high-performance pipe flange designed for secure, leak-proof connections in demanding industrial applications. Made from corrosion-resistant stainless steel, it is widely used in aggressive environments where durability and hygiene are critical.

Key Features:

1. Superior Corrosion Resistance

   • Made from stainless steel grades (e.g., ASTM A182 F304/304L, F316/316L, F321), offering excellent resistance to rust, acids, and high-temperature oxidation.

   • Ideal for chemical, marine, and food processing industries.

2. High Strength & Durability

   • The tapered neck (butt-weld design) distributes stress evenly, reducing fatigue and extending service life.

   • Suitable for high-pressure and high-temperature (HPHT) applications.

3. Smooth Flow & Reduced Turbulence

   • The matching bore ensures a seamless transition between pipe and flange, minimizing pressure drops and erosion.

4. Leak-Proof Welded Connection

   • The flange is butt-welded to the pipe, providing a robust, permanent joint with no weak points.

5. Easy Alignment & Installation

   • The long neck facilitates proper alignment during welding, reducing the risk of misalignment.

Common Standards & Specifications:

• ASME B16.5 (Standard dimensions, NPS ½” to 24”)

• ASME B16.47 (Large-diameter flanges, Series A & B)

• EN 1092-1 (European standard)

• MSS SP-44 (Pipeline applications)

• Material Grades: ASTM A182 (F304, F316, F321), A240 (304/316)

Applications:

✔ Oil & Gas – Refineries, pipelines, offshore rigs
✔ Chemical & Petrochemical – Acid, alkali, and solvent handling
✔ Pharmaceutical & Food Processing – Hygienic, corrosion-free systems
✔ Power Plants – Steam, high-temperature fluid transport
✔ Water Treatment & Marine – Saltwater-resistant piping